 | Term | Definition |
 | 1,1,1-Trichloroethane | 1,1,1-Trichloroethane (C2H3Cl3) |
| 1,1,2,2-Tetrachloroethane | 1,1,2,2-Tetrachloroethane (C2H2Cl4) |
| 1,1,2-Trichloroethane | 1,1,2-Trichloroethane (C2H3Cl3) |
| 1,1-Dichloroethane | 1,1-Dichloroethane (C2H4Cl2) |
| 1,1-Dichloroethene | 1,1-Dichloroethene (C2H2Cl2) |
| 1,2,3-Trimethylbenzene | 1,2,3-Trimethylbenzene (C9H12) |
| 1,2,4,5-tetrachlorobenzene | 1,2,4,5-tetrachlorobenzene (C6H2Cl4) |
| 1,2,4-Trichlorobenzene | 1,2,4-Trichlorobenzene (C6H3Cl3) |
| 1,2,4-Trimethylbenzene | 1,2,4-Trimethylbenzene |
| 1,2-Dibromo-3-chloropropane | 1,2-Dibromo-3-chloropropane (C3H5Br2Cl) |
| 1,2-Dichlorobenzene | 1,2-Dichlorobenzene (C6H4Cl2) |
| 1,2-Dichloroethane | 1,2-Dichloroethane (C2H4Cl2) |
| 1,2-Dichloropropane | 1,2-Dichloropropane (C3H6Cl2) |
| 1,2-Dimethylnaphthalene | 1,2-Dimethylnaphthalene (C10H6(CH3)2), a polycyclic aromatic hydrocarbon (PAH) |
| 1,2-Dinitrobenzene | 1,2-Dinitrobenzene (C6H4N2O4) |
| 1,2-Diphenylhydrazine | 1,2-Diphenylhydrazine (C12H12N2) |
| 1,3,5-Trimethylbenzene | 1,3,5-Trimethylbenzene (C6H3(CH3)3) |
| 1,3-Dichlorobenzene | 1,3-Dichlorobenzene (C6H4Cl2) |
| 1,3-Dimethyladamantane | 1,3-Dimethyladamantane (C12H20). |
| 1,3-Dimethylnaphthalene | 1,3-Dimethylnaphthalene (C10H6(CH3)2), a polycyclic aromatic hydrocarbon (PAH) |
| 1,3-Dinitrobenzene | 1,3-Dinitrobenzene (C6H4N2O4) |
| 1,4,5,8-Tetramethylnaphthalene | 1,4,5,8-Tetramethylnaphthalene (C14H16), a polycyclic aromatic hydrocarbon (PAH) |
| 1,4,5-Trimethylnaphthalene | 1,4,5-Trimethylnaphthalene (C10H5(CH3)3), a polycyclic aromatic hydrocarbon (PAH) |
| 1,4,6-Trimethylnaphthalene | 1,4,6-Trimethylnaphthalene (C10H5(CH3)3), a polycyclic aromatic hydrocarbon (PAH) |
| 1,4-Dichlorobenzene | 1,4-Dichlorobenzene (C6H4Cl2) |
| 1,4-Dimethylnaphthalene | 1,4-Dimethylnaphthalene (C10H6(CH3)2), a polycyclic aromatic hydrocarbon (PAH) |
| 1,4-Dinitrobenzene | 1,4-Dinitrobenzene (C6H4N2O4) |
| 1,5-Dimethylnaphthalene | 1,5-Dimethylnaphthalene (C10H6(CH3)2), a polycyclic aromatic hydrocarbon (PAH) |
| 1,6,7-Trimethylnaphthalene | 1,6,7-Trimethylnaphthalene (C10H5(CH3)3), a polycyclic aromatic hydrocarbon (PAH) |
| 1,6-Dimethylnaphthalene | 1,6-Dimethylnaphthalene (C10H6(CH3)2), a polycyclic aromatic hydrocarbon (PAH) |
| 1,8-Dimethylnaphthalene | 1,8-Dimethylnaphthalene (C10H6(CH3)2), a polycyclic aromatic hydrocarbon (PAH) |
| 13b(H),17a(H)-20R-Diacholestane | 13b(H),17a(H)-20R-Diacholestane |
| 13b(H),17a(H)-20S-Diacholestane | 13b(H),17a(H)-20S-Diacholestane |
| 13b(H),17a(H)-20S-Methyldiacholestane | 13b(H),17a(H)-20S-Methyldiacholestane |
| 14a(H),17a(H)-20R-Cholestane | 14a(H),17a(H)-20R-Cholestane |
| 14a(H),17a(H)-20R-Ethylcholestane | 14a(H),17a(H)-20R-Ethylcholestane |
| 14a(H),17a(H)-20R-methylcholestane | 14a(H),17a(H)-20R-methylcholestane |
| 14a(H),17a(H)-20S-Cholestane | 14a(H),17a(H)-20S-Cholestane |
| 14a(H),17a(H)-20S-Ethylcholestane | 14a(H),17a(H)-20S-Ethylcholestane |
| 14a(H),17a(H)-20S-methylcholestane | 14a(H),17a(H)-20S-methylcholestane |
| 14b(H),17b(H)-20R-Cholestane | 14b(H),17b(H)-20R-Cholestane |
| 14b(H),17b(H)-20R-Ethylcholestane | 14b(H),17b(H)-20R-Ethylcholestane |
| 14b(H),17b(H)-20R-Methylcholestane | 14b(H),17b(H)-20R-Methylcholestane |
| 14b(H),17b(H)-20S-Cholestane | 14b(H),17b(H)-20S-Cholestane |
| 14b(H),17b(H)-20S-Ethylcholestane | 14b(H),17b(H)-20S-Ethylcholestane |
| 14b(H),17b(H)-20S-Methylcholestane | 14b(H),17b(H)-20S-Methylcholestane |
| 17a(H),21b(H)-25-Norhopane | 17a(H),21b(H)-25-Norhopane |
| 17a(H),21b(H)-28,30-Bisnorhopane | 17a(H),21b(H)-28,30-Bisnorhopane |
| 17a(H),21b(H)-hopane | 17a(H),21b(H)-hopane |
| 17a(H)-Diahopane | 17a(H)-Diahopane |
| 17b(H),21a(H)-hopane (moretane) | 17b(H),21a(H)-hopane (moretane) |
| 18a(H) and 18b(H)-Oleananes | 18a(H) and 18b(H)-Oleananes |
| 18a(H),21b(H)-30-Norneohopane (C29Ts) | 18a(H),21b(H)-30-Norneohopane (C29Ts) |
| 19-But-Fucoxanthin | 19-But-Fucoxanthin, a pigment |
| 19-Hexanoyloxyfucoxanthin | The phytoplankton pigment 19-Hexanoyloxyfucoxanthin |
| 19-Hex-Fucoxanthin | 19-Hex-Fucoxanthin, a pigment |
| 1-Chloronaphthalene | 1-Chloronaphthalene (C10H7Cl) |
| 1-Ethylnaphthalene | 1-Ethylnaphthalene (C10H7C2H5), a polycyclic aromatic hydrocarbon (PAH) |
| 1-Methylanthracene | 1-Methylanthracene (C15H12), a polycyclic aromatic hydrocarbon (PAH) |
| 1-Methyldibenzothiophene | 1-Methyldibenzothiophene (C13H10S) |
| 1-Methylfluorene | 1-Methylfluorene (C14H12), a polycyclic aromatic hydrocarbon (PAH) |
| 1-Methylnaphthalene | 1-Methylnaphthalene (C10H7CH3), a polycyclic aromatic hydrocarbon (PAH) |
| 1-Methylphenanthrene | 1-Methylphenanthrene (C15H12), a polycyclic aromatic hydrocarbon (PAH) |
| 1-Naphthalenol methylcarbamate | 1-Naphthalenol methylcarbamate (C12H11NO2) |
| 2,2-dichlorovinyl dimethyl phosphate | 2,2-dichlorovinyl dimethyl phosphate (C4H7Cl2O4P) |
| 2,3,4,6-Tetrachlorophenol | 2,3,4,6-Tetrachlorophenol (C6H2Cl4O) |
| 2,3,5-Trimethylnaphthalene | 2,3,5-Trimethylnaphthalene (C13H14), a polycyclic aromatic hydrocarbon (PAH) |
| 2,3,6-Trimethylnaphthalene | 2,3,6-Trimethylnaphthalene (C10H5(CH3)3), a polycyclic aromatic hydrocarbon (PAH) |
| 2,3-Dimethylnaphthalene | 2,3-Dimethylnaphthalene (C10H6(CH3)2), a polycyclic aromatic hydrocarbon (PAH) |
| 2,4,5-Trichlorophenol | 2,4,5-Trichlorophenol (C6H3Cl3O) |
| 2,4,6-Trichlorophenol | 2,4,6-Trichlorophenol (TCP) (C6H2Cl3OH) |
| 2,4-Dichlorophenol | 2,4-Dichlorophenol (C6H4Cl2O) |
| 2,4-Dimethylphenol | 2,4-Dimethylphenol (C8H10O) |
| 2,4-Dinitrophenol | 2,4-Dinitrophenol (C6H4N2O5) |
| 2,4-Dinitrotoluene | 2,4-Dinitrotoluene (C7H6N2O4) |
| 2,6-Dichlorophenol | 2,6-Dichlorophenol (C6H4Cl2O) |
| 2,6-Dinitrotoluene | 2,6-Dinitrotoluene (C7H6N2O4) |
| 2,7-Dimethylnaphthalene | 2,7-Dimethylnaphthalene (C10H6(CH3)2), a polycyclic aromatic hydrocarbon (PAH) |
| 2-Butanone (MEK) | 2-Butanone (MEK) (C4H8O) |
| 2-Butoxyethanol | 2-Butoxyethanol (CH3(CH2)2CH2OCH2OH) |
| 2-Chloronaphthalene | 2-Chloronaphthalene (C10H7Cl) |
| 2-Chlorophenol | 2-Chlorophenol (C6H5ClO) |
| 2-Hexanone | 2-Hexanone (C6H12O) |
| 2-Methylanthracene | 2-Methylanthracene (C15H12), a polycyclic aromatic hydrocarbon (PAH) |
| 2-Methyldibenzothiophene | 2-Methyldibenzothiophene (C13H10S), a polycyclic aromatic hydrocarbon (PAH) |
| 2-Methylnaphthalene | 2-Methylnaphthalene (C10H7CH3), a polycyclic aromatic hydrocarbon (PAH) |
| 2-Methylphenanthrene | 2-Methylphenanthrene (C15H12), a polycyclic aromatic hydrocarbon (PAH) |
| 2-Methylphenol | 2-Methylphenol (C7H8O) |
| 2-Nitroaniline | 2-Nitroaniline (C6H6N2O2) |
| 2-Nitrophenol | 2-Nitrophenol (C6H5NO3) |
| 3,3-Dichlorobenzidine | 3,3-Dichlorobenzidine (C12H10Cl2N2) |
| 3,6-Dimethylphenanthrene | 3,6-Dimethylphenanthrene (C16H14), a polycyclic aromatic hydrocarbon (PAH) |
| 30,31,32,33,34-Pentakishomohopane-22R | 30,31,32,33,34-Pentakishomohopane-22R |
| 30,31,32,33,34-Pentakishomohopane-22S | 30,31,32,33,34-Pentakishomohopane-22S |
| 30,31,32,33-Tetrakishomohopane-22R | 30,31,32,33-Tetrakishomohopane-22R |
| 30,31,32,33-Tetrakishomohopane-22S | 30,31,32,33-Tetrakishomohopane-22S |
| 30,31,32-Trishomohopane-22R | 30,31,32-Trishomohopane-22R |
| 30,31,32-Trishomohopane-22S | 30,31,32-Trishomohopane-22S |
| 30,31-Bishomohopane-22R | 30,31-Bishomohopane-22R |
| 30,31-Bishomohopane-22S | 30,31-Bishomohopane-22S |
| 30-Homohopane-22R | 30-Homohopane-22R |
| 30-Homohopane-22S | 30-Homohopane-22S |
| 30-Norhopane | A series of hopanes with one less methyl group in the sidechain than the hopanes |
| 30-Normoretane | 30-Normoretane, formula : C29H50 |
| 3-Nitroaniline | 3-Nitroaniline (C6H6N2O2) |
| 4,4-DDD | Dichlorodiphenyldichloroethane (C14H10Cl4) |
| 4,4-DDE | Dichlorodiphenyldichloroethylene (C14H8Cl4) |
| 4,4-DDT | Dichlorodiphenyltrichloroethane (C14H9Cl5) |
| 4,4-Methylenebis(2-chloroaniline) | 4,4'-Methylenebis(2-chloroaniline) (C13H12Cl2N2) |
| 4,4-Methylenebis(N,N-dimethylaniline) | 4,4'-Methylenebis(N,N-dimethylaniline) (C17H22N2) |
| 4,6-Dinitro-2-methylphenol | 4,6-Dinitro-2-methylphenol (C7H6N2O5) |
| 4-Bromophenylphenyl ether | 4-Bromophenylphenyl ether (C12H9BrO) |
| 4-Chloro-3-methylphenol | 4-Chloro-3-methylphenol (C7H7ClO) |
| 4-Chloroaniline | 4-Chloroaniline (C6H6ClN) |
| 4-Chlorophenylphenyl ether | 4-Chlorophenylphenyl ether (C12H9ClO) |
| 4-Methylchrysene | 4-Methylchrysene (C19H14), a polycyclic aromatic hydrocarbon (PAH) |
| 4-Methyldibenzothiophene | 4-Methyldibenzothiophene (C13H10S), a polycyclic aromatic hydrocarbon (PAH) |
| 4-Methylphenol | 4-Methylphenol (C7H8O) |
| 4-Nitroaniline | 4-Nitroaniline (C6H6N2O2) |
| 4-Nitrophenol | 4-Nitrophenol (C6H5NO3) |
| 9 cis-Neoxanthin | The phytoplankton pigment 9 cis-Neoxanthin |
| 9,10-Dimethylanthracene | 9,10-Dimethylanthracene (C16H14), a polycyclic aromatic hydrocarbon (PAH) |
| Absorbance | The amount of radiation absorbed by a material |
| Abundance | The relative representation of a species in a particular ecosystem. If this generic term is used, the publisher should specify/qualify the species, class, etc. being measured in the method, qualifier, or other appropriate field. |
| Acenaphthene | Acenaphthene (C12H10) |
| Acenaphthylene | Acenaphthylene (C12H8), a polycyclic aromatic hydrocarbon (PAH) |
| Acetate | Acetate |
| Acetic Acid | Acetic Acid (C2H4O2) |
| Acetone | Acetone (C3H6O) |
| Acetophenone | Acetophenone (C6H5C(O)CH3) |
| Acid neutralizing capacity | Acid neutralizing capacity |
| Acidity, CO2 acidity | CO2 acidity |
| Acidity, exchange | The total amount of the Cation Exchange Capacity (CEC) of a soil that is due to H+ and Al3+ ions. It is a proportion of the total acidity and it is dependent on the type of soil and the percentage of the CEC that is composed of exchangeable bases (Ca2+, Mg2+, K+). |
| Acidity, hot | Hot Acidity |
| Acidity, mineral acidity | Mineral Acidity |
| Acidity, total acidity | Total acidity |
| Adamantane | Adamantane (C10H16) |
| Agency code | Code for the agency which analyzed the sample |
| Albedo | The ratio of reflected to incident light. |
| Aldrin | Aldrin (C12H8Cl6) |
| Alkalinity, bicarbonate | Bicarbonate Alkalinity |
| Alkalinity, carbonate | Carbonate Alkalinity |
| Alkalinity, carbonate plus bicarbonate | Alkalinity, carbonate plus bicarbonate |
| Alkalinity, hydroxide | Hydroxide Alkalinity |
| Alkalinity, total | Total Alkalinity |
| Alloxanthin | The phytoplankton pigment Alloxanthin |
| Aluminum, dissolved | Dissolved Aluminum (Al) |
| Aluminum, particulate | Particulate aluminum in suspension |
| Aluminum, total | Aluminum (Al). Total indicates was measured on a whole water sample. |
| Ammonium flux | Ammonium (NH4) flux |
| Aniline | Aniline (C6H7N) |
| Anthracene | Anthracene (C14H10), a polycyclic aromatic hydrocarbon (PAH) |
| Antimony, dissolved | Dissolved antimony (Sb)."Dissolved" indicates measurement was on a filtered sample. |
| Antimony, distribution coefficient | Ratio of concentrations of antimony in two phases in equilibrium with each other. Phases must be specified. |
| Antimony, particulate | Particulate antimony (Sb) in suspension |
| Antimony, total | Total antimony (Sb). "Total" indicates was measured on a whole water (unfiltered) sample. |
| Area | Area of a measurement location |
| Argon | Argon |
| Argon, dissolved | Dissolved Argon |
| Aroclor-1016 | Aroclor-1016 (C24H13Cl7), a PCB mixture |
| Aroclor-1242 | Aroclor-1242 (C12H6Cl4), a PCB mixture |
| Aroclor-1254 | Aroclor-1254 (C12H5Cl5), a PCB mixture |
| Aroclor-1260 | Aroclor-1260 (C12H3Cl7), a PCB mixture |
| Arsenic, dissolved | Dissolved Arsenic. For chemical terms, dissolved represents a filtered sample. |
| Arsenic, distribution coefficient | Ratio of concentrations of arsenic in two phases in equilibrium with each other. Phases must be specified. |
| Arsenic, particulate | Particulate arsenic (As) in suspension |
| Arsenic, total | Total arsenic (As). Total indicates was measured on a whole water sample. |
| Asteridae coverage | Areal coverage of the plant Asteridae |
| Barium, dissolved | Dissolved Barium (Ba) |
| Barium, distribution coefficient | Ratio of concentrations of barium in two phases in equilibrium with each other. Phases must be specified |
| Barium, particulate | Particulate barium (Ba) in suspension |
| Barium, total | Total Barium (Ba). For chemical terms, "total" indicates an unfiltered sample. |
| Barometric pressure | Barometric pressure |
| Baseflow | The portion of streamflow (discharge) that is supplied by groundwater sources. |
| Batis maritima Coverage | Areal coverage of the plant Batis maritima |
| Battery temperature | The battery temperature of a datalogger or sensing system |
| Battery voltage | The battery voltage of a datalogger or sensing system, often recorded as an indicator of data reliability |
| Benthos | Benthic species |
| Benz(a)anthracene | Benz(a)anthracene (C18H12), a polycyclic aromatic hydrocarbon (PAH) |
| Benzene | Benzene (C6H6) |
| Benzo(a)pyrene | Benzo(a)pyrene (C20H12), a polycyclic aromatic hydrocarbon (PAH) |
| Benzo(b)fluoranthene | Benzo(b)fluoranthene (C20H12), a polycyclic aromatic hydrocarbon (PAH) |
| Benzo(b)fluorene | Benzo(b)fluorene (C17H12), a polycyclic aromatic hydrocarbon (PAH) |
| Benzo(e)pyrene | Benzo(e)pyrene (C20H12), a polycyclic aromatic hydrocarbon (PAH) |
| Benzo(g,h,i)perylene | Benzo(g,h,i)perylene (C22H12), a polycyclic aromatic hydrocarbon (PAH) |
| Benzo(k)fluoranthene | Benzo(k)fluoranthene (C20H12), a polycyclic aromatic hydrocarbon (PAH) |
| Benzoic acid | Benzoic acid (C7H6O2) |
| Benzyl alcohol | Benzyl alcohol (C7H8O) |
| Beryllium, dissolved | Dissolved Beryllium (Be) . For chemical terms, "dissolved"indicates a filtered sample. |
| Beryllium, total | Total Beryllium (Be). For chemical terms, "total" indicates an unfiltered sample. |
| Bicarbonate | Bicarbonate (HCO3-) |
| Bifenthrin | Bifenthrin (C23H22ClF3O2) |
| Biogenic silica | Hydrated silica (SiO2 nH20) |
| Biomass | Mass of living biological organisms in a given area or ecosystem at a given time. If this generic term is used, the publisher should specify/qualify the species, class, etc. being measured in the method, qualifier, or other appropriate field. |
| Biomass, phytoplankton | Total mass of phytoplankton, per unit area or volume |
| Biomass, total | Total biomass |
| Biphenyl | Biphenyl ((C6H5)2), a polycyclic aromatic hydrocarbon (PAH), also known as diphenyl or phenylbenzene or 1,1'-biphenyl or lemonene |
| Bis(2-chloroethoxy)methane | Bis(2-chloroethoxy)methane (C5H10Cl2O2) |
| bis(2-Chloroethyl)ether | bis(2-Chloroethyl)ether (C4H8Cl2O) |
| Bis-(2-ethylhexyl) phthalate | Bis-(2-ethylhexyl) phthalate (C6H4(C8H17COO)2) |
| bis-2-chloroisopropyl ether | bis-2-chloroisopropyl ether (C6H12Cl2O) |
| Blue-green algae (cyanobacteria), phycocyanin | Blue-green algae (cyanobacteria) with phycocyanin pigments |
| BOD1 | 1-day Biochemical Oxygen Demand |
| BOD2, carbonaceous | 2-day Carbonaceous Biochemical Oxygen Demand |
| BOD20 | 20-day Biochemical Oxygen Demand |
| BOD20, carbonaceous | 20-day Carbonaceous Biochemical Oxygen Demand |
| BOD20, nitrogenous | 20-day Nitrogenous Biochemical Oxygen Demand |
| BOD3, carbonaceous | 3-day Carbonaceous Biochemical Oxygen Demand |
| BOD4, carbonaceous | 4-day Carbonaceous Biological Oxygen Demand |
| BOD5 | 5-day Biochemical Oxygen Demand |
| BOD5, carbonaceous | 5-day Carbonaceous Biochemical Oxygen Demand |
| BOD5, nitrogenous | 5-day Nitrogenous Biochemical Oxygen Demand |
| BOD6, carbonaceous | 6-day Carbonaceous Biological Oxygen Demand |
| BOD7, carbonaceous | 7-day Carbonaceous Biochemical Oxygen Demand |
| BODu | Ultimate Biochemical Oxygen Demand |
| BODu, carbonaceous | Carbonaceous Ultimate Biochemical Oxygen Demand |
| BODu, nitrogenous | Nitrogenous Ultimate Biochemical Oxygen Demand |
| Body length | Length of the body of an organism |
| Borehole log material classification | Classification of material encountered by a driller at various depths during the drilling of a well and recorded in the borehole log. |
| Boron, dissolved | dissolved boron |
| Boron, total | Total Boron (B) |
| Borrichia frutescens Coverage | Areal coverage of the plant Borrichia frutescens |
| Bromide, dissolved | Dissolved Bromide (Br-) |
| Bromide, total | Total Bromide (Br-) |
| Bromine | Bromine (Br2) |
| Bromine, dissolved | Dissolved Bromine (Br2) |
| Bromodichloromethane | Bromodichloromethane (CHBrCl2) |
| Bromoform | Bromoform (CHBr3), a haloform |
| Bromomethane (Methyl bromide) | Bromomethane (Methyl bromide) (CH3Br) |
| Bulk density | The mass of many particles of the material divided by the total volume they occupy. The total volume includes particle volume, inter-particle void volume and internal pore volume. |
| Bulk electrical conductivity | Bulk electrical conductivity of a medium measured using a sensor such as time domain reflectometry (TDR), as a raw sensor response in the measurement of a quantity like soil moisture. |
| Butane | Butane |
| Butylbenzylphthalate | Butylbenzylphthalate (C19H20O4) |
| Butyric Acid | Butyric Acid (C4H8O2) |
| C1-Chrysenes | A group of alkyl chrysene compounds which all have one carbon group (that is, one methyl group) attached |
| C1-Dibenzothiophenes | A group of alkyl dibenzothiophene compounds which all have one carbon group (that is, one methyl group) attached |
| C1-Fluoranthenes/Pyrenes | A group of alkyl fluoranthene and pyrene compounds which all have one carbon group (that is, one methyl group) attached |
| C1-Fluorene | A group of alkyl fluorene compounds which all have one carbon group (that is, one methyl group) attached |
| C1-Naphthalene | A group of alkyl naphthalene compounds which all have one carbon group (that is, one methyl group) attached |
| C1-Phenanthrene/Anthracene | A group of alkyl phenanthrene and anthracene compounds which all have one carbon group (that is, one methyl group) attached |
| C23 Tricyclic Terpane | C23 Tricyclic Terpane |
| C24 Tetracyclic Terpane | C24 Tetracyclic Terpane |
| C24 Tricyclic Terpane | C24 Tricyclic Terpane |
| C25 Tricyclic Terpane | C25 Tricyclic Terpane |
| C26 Tricyclic Terpane-22R | C26 Tricyclic Terpane-22R |
| C26 Tricyclic Terpane-22S | C26 Tricyclic Terpane-22S |
| C28 Tricyclic Terpane-22R | C28 Tricyclic Terpane-22R |
| C28 Tricyclic Terpane-22S | C28 Tricyclic Terpane-22S |
| C29 Tricyclic Terpane-22R | C29 Tricyclic Terpane-22R |
| C29 Tricyclic Terpane-22S | C29 Tricyclic Terpane-22S |
| C2-Chrysenes | A group of alkyl chrysene compounds which all have two carbon groups (that is, dimethyl or ethyl group) attached |
| C2-Dibenzothiophenes | A group of alkyl dibenzothiophene compounds which all have two carbon groups (that is, dimethyl or ethyl group) attached |
| C2-Fluoranthenes/Pyrenes | A group of alkyl fluoranthene and pyrene compounds which all have two carbon groups attached |
| C2-Fluorene | A a group of alkyl fluorene compounds which all have two carbon groups (that is, dimethyl or ethyl group) attached |
| C2-Naphthalene | A group of alkyl naphthalene compounds which all have two carbon groups (that is, dimethyl or ethyl group) attached |
| C2-Phenanthrene/Anthracene | A group of alkyl phenanthrene and anthracene compounds which all have two carbon groups (that is, a dimethyl or ethyl group) attached |
| C3-Chrysenes | A group of alkyl chrysene compounds which all have three carbon groups (that is, trimethyl, methylethyl, or propyl group) attached |
| C3-Dibenzothiophenes | A group of alkyl dibenzothiophene compounds which all have three carbon groups (that is, trimethyl, methylethyl, or propyl group) attached |
| C3-Fluoranthenes/Pyrenes | A group of alkyl fluoranthene and pyrene compounds which all have three carbon groups attached |
| C3-Fluorene | A group of alkyl fluorene compounds which all have three carbon groups (that is, trimethyl, methylethyl, or propyl group) attached |
| C3-Naphthalene | A group of alkyl naphthalene compounds which all have three carbon groups (that is, trimethyl, methylethyl, or propyl group) attached |
| C3-Phenanthrene/Anthracene | A group of alkyl phenanthrene and anthracene compounds which all have three carbon groups (that is, a trimethyl, methylethyl, or propyl group) attached |
| C4-Chrysenes | A group of alkyl chrysene compounds which all have four carbon groups (that is, tetramethyl, butyl, methylpropyl, or diethyl group) attached |
| C4-Dibenzothiophenes | A group of alkyl dibenzothiophene compounds which all have four carbon groups attached |
| C4-Naphthalene | A group of alkyl naphthalene compounds which all have four carbon groups (that is, tetramethyl, butyl, methylpropyl, or diethyl group) attached |
| C4-Phenanthrene/Anthracene | A group of alkyl phenanthrene and anthracene compounds which all have four carbon groups (that is, a tetramethyl, diethyl, or methylpropyl group) attached |
| Cadmium, dissolved | Dissolved Cadmium. For chemical terms, "dissolved" indicates a filtered sample. |
| Cadmium, distribution coefficient | Ratio of concentrations of cadmium in two phases in equilibrium with each other. Phases must be specified. |
| Cadmium, particulate | Particulate cadmium (Cd) in suspension |
| Cadmium, total | Total Cadmium (Cd). For chemical terms, "total" indciates an unfiltered sample. |
| Calcium, dissolved | Dissolved Calcium (Ca) |
| Calcium, total | Total Calcium (Ca) |
| Canthaxanthin | The phytoplankton pigment Canthaxanthin |
| Carbaryl | Carbaryl (C12H11NO2) |
| Carbazole | Carbazole (C12H9N) |
| Carbon consumption rate | Aggregate microbial activity in water measured as microbial electron transfer rate measured in milliamperes and converted to carbon consumption rate. |
| Carbon dioxide | Carbon dioxide |
| Carbon dioxide flux | Carbon dioxide (CO2) flux |
| Carbon dioxide storage flux | Carbon dioxide (CO2) storage flux |
| Carbon Dioxide, dissolved | Dissolved Carbon dioxide (CO2) |
| Carbon dioxide, transducer signal | Carbon dioxide (CO2), raw data from sensor |
| Carbon disulfide | Carbon disulfide (CS2) |
| Carbon monoxide, dissolved | Dissolved carbon monoxide (CO) |
| Carbon tetrachloride | Carbon tetrachloride (CCl4) |
| Carbon to nitrogen mass ratio | Carbon to nitrogen (C:N) mass ratio |
| Carbon to nitrogen molar ratio | Carbon to nitrogen (C:N) molar ratio |
| Carbon, dissolved inorganic | Dissolved Inorganic Carbon |
| Carbon, dissolved organic | Dissolved Organic Carbon |
| Carbon, dissolved total | Dissolved Total (Organic+Inorganic) Carbon |
| Carbon, particulate organic | Particulate organic carbon in suspension |
| Carbon, suspended inorganic | Suspended Inorganic Carbon |
| Carbon, suspended organic | DEPRECATED -- The use of this term is discouraged in favor of the use of the synonymous term "Carbon, particulate organic". |
| Carbon, suspended total | Suspended Total (Organic+Inorganic) Carbon |
| Carbon, total | Total (Dissolved+Particulate) Carbon |
| Carbon, total inorganic | Total (Dissolved+Particulate) Inorganic Carbon |
| Carbon, total organic | Total (Dissolved+Particulate) Organic Carbon |
| Carbon, total solid phase | Total solid phase carbon |
| Carbon-13, stable isotope ratio delta | Difference in the 13C:12C ratio between the sample and standard (del C 13) |
| Carbon-14 | A radioactive isotope of carbon which undergoes beta decay |
| Carbonate | Carbonate ion (CO3-2) concentration |
| Cesium, dissolved | Dissolved Cesium (Cs) |
| Cesium, total | Total Cesium (Cs) |
| Cesium-137 | A radioactive isotope of cesium which is formed as a fission product by nuclear fission of uranium or plutonium. |
| Chloride | Chloride (Cl-) |
| Chloride, dissolved | Dissolved Chloride (Cl-) |
| Chloride, total | Total Chloride (Cl-) |
| Chlorine | Chlorine (Cl2) |
| Chlorine, dissolved | Dissolved Chlorine (Cl2) |
| Chlorobenzene | Chlorobenzene (C6H5Cl) |
| Chlorobenzilate | Chlorobenzilate (C16H14Cl2O3) |
| Chloroethane | Chloroethane (C2H5Cl) |
| Chloroethene | Chloroethene (C2H3Cl) |
| Chloroform | Chloroform (CHCl3), a haloform |
| Chloromethane | Chloromethane (CH3Cl) |
| Chlorophyll (a+b+c) | Chlorophyll (a+b+c) |
| Chlorophyll a | Chlorophyll a |
| Chlorophyll a allomer | The phytoplankton pigment Chlorophyll a allomer |
| Chlorophyll a plus pheopigment | Sum of chlorophyll a and phaeopigments |
| Chlorophyll a to pheopigment ratio | Ratio of chlorophyll a to pheopigment |
| Chlorophyll a, corrected for pheophytin | Chlorphyll a corrected for pheophytin |
| Chlorophyll a, uncorrected for pheophytin | Chlorophyll a uncorrected for pheophytin |
| Chlorophyll b | Chlorophyll b |
| Chlorophyll c | Chlorophyll c |
| Chlorophyll c1 and c2 | Chlorophyll c1 and c2 |
| Chlorophyll c2 | Chlorophyll c2, a form of chlorophyll |
| Chlorophyll fluorescence | Chlorophyll Fluorescence |
| Chromium (III) | Trivalent Chromium |
| Chromium (VI) | Hexavalent Chromium |
| Chromium (VI), dissolved | Dissolved Hexavalent Chromium |
| Chromium, dissolved | Dissolved Chromium |
| Chromium, distribution coefficient | Ratio of concentrations of chromium in two phases in equilibrium with each other. Phases must be specified. |
| Chromium, particulate | Particulate chromium (Cr) in suspension |
| Chromium, total | Total chromium (Cr). Total indicates was measured on a whole water (unfiltered) sample. |
| Chrysene | Chrysene (C18H12), a polycyclic aromatic hydrocarbon (PAH) |
| cis-1,2-Dichloroethene | cis-1,2-Dichloroethene (C2H2Cl2) |
| cis-1,3-Dichloropropene | cis-1,3-Dichloropropene (C3H4Cl2) |
| Clay, total | Total clay |
| Cobalt, dissolved | Dissolved Cobalt (Co) |
| Cobalt, total | Total Cobalt (Co) |
| Cobalt-60 | A synthetic radioactive isotope of cobalt with a half-life of 5.27 years. |
| COD | Chemical oxygen demand |
| Coliform, fecal | Fecal Coliform |
| Coliform, total | Total Coliform |
| Color | Color in quantified in color units |
| Colored dissolved organic matter | The concentration of colored dissolved organic matter (humic substances) |
| Container number | The identifying number for a water sampler container. |
| Copper, dissolved | Dissolved Copper (Cu) |
| Copper, distribution coefficient | Ratio of concentrations of copper in two phases in equilibrium with each other. Phases must be specified. |
| Copper, particulate | Particulate copper (Cu) in suspension |
| Copper, total | Total copper (Cu). "Total" indicates was measured on a whole water (unfiltered) sample. |
| Counter | The total number of events within the measurement period |
| Cryptophytes | The chlorophyll a concentration contributed by cryptophytes |
| Cuscuta spp. coverage | Areal coverage of the plant Cuscuta spp. |
| Cyanide | Cyanide (CN) |
| Cyanobacteria | The chlorophyll a concentration contributed by cyanobacteria |
| Cyclohexane | Cyclohexane (C6H6Cl6) |
| Cytochrome P450, family 1, subfamily A, polypeptide 1, delta cycle threshold | Delta cycle threshold for Cytochrome P450, family 1, subfamily A, polypeptide 1 (cyp1a1). Cycle threshold is the PCR cycle number at which the fluorescent signal of the gene being amplified crosses the set threshold. Delta cycle threshold for cyp1a1 is the difference between the cycle threshold (Ct) of cyp1a1 gene expression and the cycle threshold (Ct) for the gene expression of the reference gene (e.g., beta-actin). |
| Cytosolic protein | The total protein concentration within the cytosolic fraction of cells. The cytosol refers to the intracellular fluid or cytoplasmic matrix of a eukaryotic cell. |
| Data shuttle attached | A categorical variable marking the attachment of a coupler or data shuttle to a logger. This is used for quality control. |
| Data shuttle detached | A categorical variable marking the detatchment of a coupler or data shuttle to a logger. This is used for quality control. |
| delta-13C of C2H6 | Isotope 13C of ethane |
| delta-13C of C3H8 | Isotope 13C of propane |
| delta-13C of C4H10 | Isotope 13C of butane |
| delta-13C of CH4 | Isotope 13C of methane |
| delta-13C of CO2 | Isotope 13C of carbon dioxide |
| delta-13C of DIC | Isotope 13C of dissolved inorganic carbon (DIC) |
| delta-13C of DOC | Isotope 13C of dissolved organic carbon (DOC) |
| delta-13C of POC | Isotope 13C of particulate organic carbon (POC) |
| delta-14C of DIC | Isotope 14C of dissolved inorganic carbon (DIC) |
| delta-14C of DOC | Isotope 14C of dissolved organic carbon (DOC) |
| delta-14C of POC | Isotope 14C of particulate organic carbon (POC) |
| delta-15N of PN | Isotope 15N of particulate nitrogen (PN) |
| delta-18O of H2O | Isotope 18O of water |
| delta-D of CH4 | hydrogen isotopes of methane |
| delta-D of H2O | hydrogen isotopes of water |
| Density | Density |
| Deuterium | Deuterium (2H), Delta D |
| Diadinoxanthin | The phytoplankton pigment Diadinoxanthin |
| Diallate (cis or trans) | Diallate (cis or trans) (C10H17Cl2NOS) |
| Diatoms | The chlorophyll a concentration contributed by diatoms |
| Diatoxanthin | The phytoplankton pigment Diatoxanthin |
| Dibenz(a,h)anthracene | Dibenz(a,h)anthracene (C22H14), a polycyclic aromatic hydrocarbon (PAH) |
| Dibenzofuran | Dibenzofuran (C12H8O) |
| Dibenzothiophene | Dibenzothiophene (C12H8S), a polycyclic aromatic hydrocarbon (PAH) |
| Dibromochloromethane | Dibromochloromethane (CHBr2Cl) |
| Dieldrin | Dieldrin (C12H8Cl6O) |
| Diethyl phthalate | Diethyl phthalate (C12H14O4) |
| Diethylene glycol | Diethylene glycol (C4H10O3) |
| Diisopropyl Ether | Diisopropyl Ether (C6H14O) |
| Dimethyl Phthalate | Dimethyl Phthalate (C10H10O4) |
| Dimethylphenanthrene | Dimethylphenanthrene (C16H14) |
| Di-n-butylphthalate | Di-n-butylphthalate (C16H22O4) |
| Di-n-octyl phthalate | Di-n-octyl phthalate (C24H38O4) |
| Dinoflagellates | The chlorophyll a concentration contributed by Dinoflagellates |
| Dinoseb | Dinoseb (C10H12N2O5) |
| Discharge | Discharge |
| Distance | Distance measured from a sensor to a target object such as the surface of a water body or snow surface. |
| Distichlis spicata Coverage | Areal coverage of the plant Distichlis spicata |
| Disulfoton | Disulfoton (C8H19O2PS3) |
| d-Limonene | d-Limonene (C10H16) |
| DNA damage, olive tail moment | In a single cell gel electrophoresis assay (comet assay), olive tail moment is the product of the percentage of DNA in the tail and the distance between the intesity centroids of the head and tail along the x-axis (Olive, et al., 1990) |
| DNA damage, percent tail DNA | In a single cell gel electrophoresis assay (comet assay), percent tail DNA is the ratio of fluorescent intensity of the tail over the total fluorescent intensity of the head (nuclear core) and tail multiplied by 100. |
| DNA damage, tail length | In a single cell gel electrophoresis assay (comet assay), tail length is the distance of DNA migration from the body of the nuclear core |
| E-coli | Escherichia coli |
| Electric Current | A flow of electric charge |
| Electric Energy | Electric Energy |
| Electric Power | Electric Power |
| Electrical conductivity | Electrical conductivity |
| End of file | A categorical variable marking the end of a data file. This is used for quality control. |
| Endosulfan I (alpha) | Endosulfan I (alpha) (C9H6Cl6O3S) |
| Endosulfan II (beta) | Endosulfan II (beta) (C9H6Cl6O3S) |
| Endosulfan Sulfate | Endosulfan Sulfate (C9H6Cl6O4S) |
| Endrin | Endrin (C12H8Cl6O) |
| Endrin aldehyde | Endrin aldehyde (C12H8Cl6O) |
| Endrin Ketone | Endrin Ketone (C12H9Cl5O) |
| Enterococci | Enterococcal bacteria |
| Ethane | Ethane |
| Ethane, dissolved | Dissolved Ethane (C2H6) |
| Ethanol | Ethanol (C2H6O) |
| Ethoxyresorufin O-deethylase, activity | Ethoxyresorufin O-deethylase (EROD) activity |
| Ethyl tert-Butyl Ether | Ethyl tert-Butyl Ether (C6H14O) |
| Ethylbenzene | Ethylbenzene (C8H10) |
| Ethylene | Ethylene (C2H4) |
| Ethylene glycol | Ethlene Glycol (C2H4(OH)2) |
| Ethylene, dissolved | Dissolved ethylene |
| Ethyne | Ethyne (C2H2) |
| Evaporation | Evaporation |
| Evapotranspiration | Evapotranspiration |
| Evapotranspiration, potential | The amount of water that could be evaporated and transpired if there was sufficient water available. |
| Fish detections | The number of fish identified by the detection equipment |
| Flash memory error count | A counter which counts the number of datalogger flash memory errors |
| Fluoranthene | Fluoranthene (C16H10), a polycyclic aromatic hydrocarbon (PAH) |
| Fluorene | Fluorene (C13H10), a polycyclic aromatic hydrocarbon (PAH) |
| Fluoride | Fluoride (F-) |
| Fluoride, dissolved | Dissolved Fluoride (F-) |
| Fluorine | Fluorine (F2) |
| Fluorine, dissolved | Dissolved Fluorine (F2) |
| Formate | Formate |
| Formic acid | Formic acid (CH2O2) |
| Frequency of Rotation | Number of rotations within a time period |
| Friction velocity | Friction velocity |
| Fucoxanthin | A xanthophyll, with formula C42H58O6 |
| Gage height | Water level with regard to an arbitrary gage datum (also see Water depth for comparison) |
| Global Radiation | Solar radiation, direct and diffuse, received from a solid angle of 2p steradians on a horizontal surface.
Source: World Meteorological Organization, Meteoterm |
| Glutaraldehyde | Glutaraldehyde (C5H8O2) |
| Glutathione S-transferase, activity | Glutathione S-transferase (GST) activity |
| Glutathione S-transferase, delta cycle threshold | Delta cycle threshold for glutathione S-transferase (gst). Cycle threshold is the PCR cycle number at which the fluorescent signal of the gene being amplified crosses the set threshold. Delta cycle threshold for gst is the difference between the cycle threshold (Ct) of gst gene expression and the cycle threshold (Ct) for the gene expression of the reference gene (e.g., beta-actin). |
| Gravel, total | Total gravel |
| Green algae | The chlorophyll a concentration contributed by green algae |
| Gross alpha radionuclides | Gross Alpha Radionuclides |
| Gross beta radionuclides | Gross Beta Radionuclides |
| Ground heat flux | Ground heat flux |
| Groundwater Depth | Groundwater depth is the distance between the water surface and the ground surface at a specific location specified by the site location and offset. |
| Hardness, Calcium | Hardness of calcium |
| Hardness, carbonate | Carbonate hardness also known as temporary hardness |
| Hardness, Magnesium | Hardness of magnesium |
| Hardness, non-carbonate | Non-carbonate hardness |
| Hardness, total | Total hardness |
| Heat index | The combination effect of heat and humidity on the temperature felt by people. |
| height, above sea floor | Vertical distance from the sea floor to a point. |
| Helium | Helium |
| Helium, dissolved | Dissolved Helium (He) |
| Heptachlor | Heptachlor (C10H5Cl7) |
| Heptachlor epoxide | Heptachlor epoxide (C10H5Cl7O) |
| Hexachlorobenzene | Hexachlorobenzene (C6Cl6) |
| Hexachlorobutadiene | Hexachlorobutadiene (C4Cl6) |
| Hexachlorocyclopentadiene | Hexachlorocyclopentadiene (C5Cl6) |
| Hexachloroethane | Hexachloroethane (C2Cl6) |
| Hexane | Hexane |
| Host connected | A categorical variable marking the attachment of a host computer to a logger. This is used for quality control. |
| Hydrogen | Hydrogen |
| Hydrogen sulfide | Hydrogen sulfide (H2S) |
| Hydrogen, dissolved | Dissolved Hydrogen |
| Hydrogen-2, stable isotope ratio delta | Difference in the 2H:1H ratio between the sample and standard |
| Imaginary dielectric constant | Soil reponse of a reflected standing electromagnetic wave of a particular frequency which is related to the dissipation (or loss) of energy within the medium. This is the imaginary portion of the complex dielectric constant. |
| Indeno(1,2,3-cd)pyrene | Indeno(1,2,3-cd)pyrene (C22H12) |
| Indicator | Binary status to indicate the status of an instrument or other piece of equipment. |
| Instrument status code | Code value recorded by instrument indicating some information regarding the status of the instrument |
| Intercept | The point at which one of the variables in a function equals 0. |
| Iodide, dissolved | Dissolved Iodide (I-) |
| Iron sulfide | Iron sulfide (FeS2) |
| Iron, dissolved | Dissolved Iron (Fe) |
| Iron, ferric | Ferric Iron (Fe+3) |
| Iron, ferrous | Ferrous Iron (Fe+2) |
| Iron, particulate | Particulate iron (Fe) in suspension |
| Iron, total | Total Iron (Fe) |
| Isobutane | Isobutane |
| Isobutyric acid | Isobutyric acid (C4H8O2) |
| Isopentane | Isopentane |
| Isophorone | Isophorone (C9H14O) |
| Isoprenoid RRT 1380 | Isoprenoid RRT 1380 |
| Isoprenoid RRT 1470 | Isoprenoid RRT 1470 |
| Isopropyl alcohol | Isopropyl alcohol (C3H8O) |
| Isopropylbenzene | Isopropylbenzene (C9H12) |
| Iva frutescens coverage | Areal coverage of the plant Iva frutescens |
| Lactic Acid | Lactic Acid (C3H6O3) |
| Latent heat flux | Latent Heat Flux |
| Latitude | Latitude as a variable measurement or observation (Spatial reference to be designated in methods). This is distinct from the latitude of a site which is a site attribute. |
| Lead, dissolved | Dissolved Lead (Pb). For chemical terms, dissolved indicates a filtered sample |
| Lead, distribution coefficient | Ratio of concentrations of lead in two phases in equilibrium with each other. Phases must be specified. |
| Lead, particulate | Particulate lead (Pb) in suspension |
| Lead, total | Total Lead (Pb). For chemical terms, total indicates an unfiltered sample. |
| Lead-210 | A naturally-occurring radioisotope of lead with a half-life of 22.20 years. |
| Leaf wetness | The effect of moisture settling on the surface of a leaf as a result of either condensation or rainfall. |
| Light attenuation coefficient | Light attenuation coefficient |
| Limonium nashii Coverage | Areal coverage of the plant Limonium nashii |
| Lipid content | Lipid content |
| Lithium, dissolved | Dissolved Lithium (Li). For chemical terms, dissolved indicates a filtered sample. |
| Lithium, total | Total Lithium (Li). For chemical terms, total indicates an unfiltered sample. |
| Liver, mass | Mass of the sample of liver tissue used for analyses |
| Logger stopped | A categorical variable indicating that a logger was told to stop recording data. This is used for quality control. |
| Longitude | Longitude as a variable measurement or observation (Spatial reference to be designated in methods). This is distinct from the longitude of a site which is a site attribute. |
| Low battery count | A counter of the number of times the battery voltage dropped below a minimum threshold |
| LSI | Langelier Saturation Index is an indicator of the degree of saturation of water with respect to calcium carbonate |
| Luminous Flux | A measure of the total amount of visible light present |
| Lycium carolinianum Coverage | Areal coverage of the plant Lycium carolinianum |
| Magnesium, dissolved | Dissolved Magnesium (Mg) |
| Magnesium, total | Total Magnesium (Mg) |
| Malathion | Butanedioic acid, [(dimethoxyphosphinothioyl)thio]-, diethyl ester (C10H19O6PS2) |
| Manganese, dissolved | Dissolved Manganese (Mn) |
| Manganese, particulate | Particulate manganese (Mn) in suspension |
| Manganese, total | Total manganese (Mn). "Total" indicates was measured on a whole water (unfiltered) sample. |
| Mercury, dissolved | Dissolved Mercury (Hg). For chemical terms, dissolved indicates a filtered sample. |
| Mercury, total | Total Mercury (Hg). For chemical terms, total represents an unfiltered sample. |
| Methane | Methane (CH4) |
| Methane, dissolved | Dissolved Methane (CH4) |
| Methanol | Methanol (CH3OH) |
| Methoxychlor | Methoxychlor (C16H15Cl3O2) |
| Methyl tert-butyl ether (MTBE) | Methyl tert-butyl ether (MTBE) (C5H12O) |
| Methylchrysene | Methylchrysene (C19H14) |
| Methylene blue active substances | Methylene Blue Active Substances (MBAS) |
| Methylene chloride (Dichloromethane) | Methylene chloride (Dichloromethane) (CH2Cl2) |
| Methylfluoranthene | Methylfluoranthene (C17H12) |
| Methylfluorene | Methylfluorene (C14H12) |
| Methylmercury | Methylmercury (CH3Hg) |
| Methylpyrene | Methylpyrene (C17H12) |
| Mevinphos | Mevinphos (C7H13O6P) |
| Microsomal protein | The total protein concentration within the microsomal fraction of cells. Microsomes refer to vesicle-like artifacts reformed from pieces of endoplasmic reticulum when eukaryotic cells are broken up in a laboratory. |
| Molbydenum, dissolved | Dissolved Molbydenum (Mo). For chemical terms, dissolved indicates a filtered sample. |
| Molybdenum, total | total Molybdenum (Mo). For chemical terms, total represents an unfiltered sample. |
| Momentum flux | Momentum flux |
| Monanthochloe littoralis Coverage | Areal coverage of the plant Monanthochloe littoralis |
| N, albuminoid | Albuminoid Nitrogen |
| n-alkane, C10 | C10 alkane, normal (i.e. straight-chain) isomer, common name: n-Decane, formula : C10H22 |
| n-alkane, C11 | C11 alkane, normal (i.e. straight-chain) isomer, common name: n-Undecane, formula : CH3(CH2)9CH3 |
| n-alkane, C12 | C12 alkane, normal (i.e. straight-chain) isomer, common name: n-Dodecane, formula : C12H26 |
| n-alkane, C13 | C13 alkane, normal (i.e. straight-chain) isomer, common name: n-Tridecane, formula : C13H28 |
| n-alkane, C14 | C14 alkane, normal (i.e. straight-chain) isomer, common name: n-Tetradecane, formula : C14H30 |
| n-alkane, C15 | C15 alkane, normal (i.e. straight-chain) isomer, common name: n-Pentadecane, formula : C15H32 |
| n-alkane, C16 | C16 alkane, normal (i.e. straight-chain) isomer, common name: n-Hexadecane, formula: C16H34. Synonym: cetane |
| n-alkane, C17 | C17 alkane, normal (i.e. straight-chain) isomer, common name: n-Heptadecane, formula : C17H36 |
| n-alkane, C18 | C18 alkane, normal (i.e. straight-chain) isomer, common name: n-Octadecane, formula : C18H38 |
| n-alkane, C19 | C19 alkane, normal (i.e. straight-chain) isomer, common name: n-Nonadecane, formula : C19H40 |
| n-alkane, C20 | C20 alkane, normal (i.e. straight-chain) isomer, common name: n-Icosane, formula : C20H42. Synonyms: didecyl, eicosane. |
| n-alkane, C21 | C21 alkane, normal (i.e. straight-chain) isomer, common name: n-Henicosane, formula : C21H44. |
| n-alkane, C22 | C22 alkane, normal (i.e. straight-chain) isomer, common name: n-Docosane, formula : C22H46 |
| n-alkane, C23 | C23 alkane, normal (i.e. straight-chain) isomer, common name: n-Tricosane, formula : C23H48 |
| n-alkane, C24 | C24 alkane, normal (i.e. straight-chain) isomer, common name: n-Tetracosane, formula : C24H50 |
| n-alkane, C25 | C25 alkane, normal (i.e. straight-chain) isomer, common name: n-Pentacosane, formula : C25H52 |
| n-alkane, C26 | C26 alkane, normal (i.e. straight-chain) isomer, common name: n-Hexacosane, formula : C26H54, synonyms: cerane, hexeikosane |
| n-alkane, C27 | C27 alkane, normal (i.e. straight-chain) isomer, common name: n-Heptacosane, formula : C27H56 |
| n-alkane, C28 | C28 alkane, normal (i.e. straight-chain) isomer, common name: n-Octacosane, formula : C28H58 |
| n-alkane, C29 | C29 alkane, normal (i.e. straight-chain) isomer, common name: n-Nonacosane, formula : C29H60 |
| n-alkane, C30 | C30 alkane, normal (i.e. straight-chain) isomer, common name: n-Triacontane, formula : C30H62 |
| n-alkane, C31 | C31 alkane,normal (i.e. straight-chain) isomer, common name: n-Hentriacontane, formula : C31H64, Synonym: untriacontane |
| n-alkane, C32 | C32 alkane, normal (i.e. straight-chain) isomer, common name: n-Dotriacontane, formula : C32H66, Synonym: dicetyl |
| n-alkane, C33 | C33 alkane, (i.e. straight-chain) isomer, common name: n-Tritriacontane, formula : C33H68 |
| n-alkane, C34 | C34 alkane, normal (i.e. straight-chain) isomer, common name: n-Tetratriacontane, formula : n-alkane, C34H70 |
| n-alkane, C35 | C35 alkane, normal (i.e. straight-chain) isomer, common name: n-Pentatriacontane, formula : n-alkane, C35H72 |
| n-alkane, C36 | C36 alkane, normal (i.e. straight-chain) isomer, common name: n-Hexatriacontane, formula : n-alkane, C36H74 |
| n-alkane, C37 | C37 alkane, normal (i.e. straight-chain) isomer, common name: n-Heptatriacontane, formula : n-alkane, C37H76 |
| n-alkane, C38 | C38 alkane, normal (i.e. straight-chain) isomer, common name: n-Octatriacontane, formula : n-alkane, C38H78 |
| n-alkane, C39 | C39 alkane, normal (i.e. straight-chain) isomer, common name: n-Nonatriacontane, formula : n-alkane, C39H80 |
| n-alkane, C40 | C40 alkane, normal (i.e. straight-chain) isomer, common name: n-Tetracontane, formula : n-alkane, C40H82 |
| n-alkane, C9 | C9 alkane, normal (i.e. straight-chain) isomer, common name: n-Nonane, formula : C9H20 |
| n-alkane, long-chain | long-chain alkanes, normal (i.e. straight chain) isomer (isomer range of alkanes measured should be specified) |
| n-alkane, short-chain | short-chain alkanes, normal (i.e. straight chain) isomer (isomer range of alkanes measured should be specified) |
| n-alkane, total | Total alkane, normal (i.e. straight chain) isomer (isomer range of alkanes measured should be specified) |
| Naphthalene | Naphthalene (C10H8) |
| NDVI | Normalized difference vegetation index |
| Net heat flux | Outgoing rate of heat energy transfer minus the incoming rate of heat energy transfer through a given area |
| Nickel, dissolved | Dissolved Nickel (Ni) |
| Nickel, distribution coefficient | Ratio of concentrations of nickel in two phases in equilibrium with each other. Phases must be specified. |
| Nickel, particulate | Particulate nickel (Ni) in suspension |
| Nickel, total | Total Nickel (Ni). "Total" indicates was measured on a whole water (unfiltered) sample. |
| Nitrobenzene | Nitrobenzene (C6H5NO2) |
| Nitrogen, dissolved (free+ionized) Ammonia (NH3) + (NH4) | Dissolved (free+ionized) Ammonia |
| Nitrogen, dissolved inorganic | Dissolved inorganic nitrogen |
| Nitrogen, dissolved Kjeldahl | Dissolved Kjeldahl (organic nitrogen + ammonia (NH3) + ammonium (NH4))nitrogen |
| Nitrogen, dissolved nitrate (NO3) | Dissolved nitrate (NO3) nitrogen |
| Nitrogen, dissolved nitrite (NO2) | Dissolved nitrite (NO2) nitrogen |
| Nitrogen, dissolved nitrite (NO2) + nitrate (NO3) | Dissolved nitrite (NO2) + nitrate (NO3) nitrogen |
| Nitrogen, dissolved organic | Dissolved Organic Nitrogen |
| Nitrogen, gas | Gaseous Nitrogen (N2) |
| Nitrogen, gas production rate | Rate nitrogen gas increase in sample, indicates potential denitrification |
| Nitrogen, inorganic | Total Inorganic Nitrogen |
| Nitrogen, NH3 | Free Ammonia (NH3) |
| Nitrogen, NH3 + NH4 | Total (free+ionized) Ammonia |
| Nitrogen, NH4 | Ammonium (NH4) |
| Nitrogen, nitrate (NO3) | Nitrate (NO3) Nitrogen |
| Nitrogen, nitrite (NO2) | Nitrite (NO2) Nitrogen |
| Nitrogen, nitrite (NO2) + nitrate (NO3) | Nitrite (NO2) + Nitrate (NO3) Nitrogen |
| Nitrogen, organic | Organic Nitrogen |
| Nitrogen, organic kjeldahl | Organic Kjeldahl (organic nitrogen + ammonia (NH3) + ammonium (NH4)) nitrogen |
| Nitrogen, particulate | Particulate nitrogen (N) in suspension |
| Nitrogen, particulate organic | Particulate Organic Nitrogen |
| Nitrogen, total | Total Nitrogen (NO3+NO2+NH4+NH3+Organic) |
| Nitrogen, total dissolved | Total dissolved nitrogen |
| Nitrogen, total kjeldahl | Total Kjeldahl Nitrogen (Ammonia+Organic) |
| Nitrogen, total nitrite | Total nitrite (NO2) |
| Nitrogen, total organic | Total (dissolved + particulate) organic nitrogen |
| Nitrogen-15 | 15 Nitrogen, Delta Nitrogen |
| Nitrogen-15, stable isotope ratio delta | Difference in the 15N:14N ratio between the sample and standard (del N 15) |
| Nitrous oxide | Nitrous oxide (N2O) |
| N-Nitrosodiethylamine | N-Nitrosodiethylamine (C4H10N2O) |
| N-Nitrosodimethylamine | N-Nitrosodimethylamine (C2H6N2O) |
| N-Nitrosodi-n-butylamine | N-Nitrosodi-n-butylamine (C8H18N2O) |
| N-Nitrosodi-n-propylamine | N-Nitrosodi-n-propylamine (C6H14N2O) |
| N-Nitrosodiphenylamine | N-Nitrosodiphenylamine (C12H10N2O) |
| N-Nitrosomethylethylamine | N-Nitrosomethylethylamine (C3H8N2O) |
| No vegetation coverage | Areal coverage of no vegetation |
| Norpristane (1650) | Norpristane (1650) |
| Odor | Odor |
| Offset | Constant to be added as an offset to a variable of interest. |
| Oil and grease | Oil and grease |
| Organic matter | The organic matter component of a complex material. |
| Orientation | Azimuth orientation of sensor platform |
| Osmotic pressure | Osmotic pressure |
| Oxygen | Oxygen |
| Oxygen flux | Oxygen (O2) flux |
| Oxygen uptake | Consumption of oxygen by biological and/or chemical processes |
| Oxygen, dissolved | Dissolved oxygen |
| Oxygen, dissolved percent of saturation | Dissolved oxygen, percent saturation |
| Oxygen, dissolved, transducer signal | Dissolved oxygen, raw data from sensor |
| Oxygen-18 | 18 O, Delta O |
| Oxygen-18, stable isotope ratio delta | Difference in the 18O:16O ratio between the sample and standard |
| o-Xylene | o-Xylene (C8H10) |
| Ozone | Ozone (O3) |
| Parameter | Parameter related to a hydrologic process. An example usage would be for a starge-discharge relation parameter. |
| Parathion-ethyl | Parathion-ethyl (C10H14NO5PS) |
| Pentachlorobenzene | Pentachlorobenzene (C6HCl5) |
| Pentachlorophenol | Pentachlorophenol (C6HCl5O) |
| Pentane | Pentane |
| Percent full scale | The percent of full scale for an instrument |
| Peridinin | The phytoplankton pigment Peridinin |
| Permethrin | Permethrin (C21H20Cl2O3) |
| Permittivity | Permittivity is a physical quantity that describes how an electric field affects, and is affected by a dielectric medium, and is determined by the ability of a material to polarize in response to the field, and thereby reduce the total electric field inside the material. Thus, permittivity relates to a material's ability to transmit (or "permit") an electric field. |
| Perylene | Perylene (C20H12), a polycyclic aromatic hydrocarbon (PAH) |
| Petroleum hydrocarbon, total | Total petroleum hydrocarbon |
| pH | pH is the measure of the acidity or alkalinity of a solution. pH is formally a measure of the activity of dissolved hydrogen ions (H+). Solutions in which the concentration of H+ exceeds that of OH- have a pH value lower than 7.0 and are known as acids. |
| Phenanthrene | Phenanthrene (C14H10), a polycyclic aromatic hydrocarbon (PAH) |
| Phenol | Phenol (C6H5OH) |
| Phenolics, total | Total Phenolics |
| Pheophorbide a | Pheophorbide a is a degradation product of Chlorophyll, C35H36N4O5 |
| Pheophytin | Pheophytin (Chlorophyll which has lost the central Mg ion) is a degradation product of Chlorophyll |
| Pheopigment, total | Total pheopigments, a non-photosynthetic degradation product of algal chlorophyll pigments |
| Phorate | Phorate (C7H17O2PS3) |
| Phosphorodithioic acid | Phosphorodithioic acid (C10N12N3O3PS2) |
| Phosphorus, dissolved | Dissolved Phosphorus (P) |
| Phosphorus, dissolved organic | Dissolved organic phosphorus |
| Phosphorus, inorganic | Inorganic Phosphorus |
| Phosphorus, organic | Organic Phosphorus |
| Phosphorus, orthophosphate | Orthophosphate Phosphorus |
| Phosphorus, orthophosphate dissolved | Dissolved orthophosphate phosphorus |
| Phosphorus, orthophosphate total | Total orthophosphate phosphorus |
| Phosphorus, particulate | Particulate phosphorus |
| Phosphorus, particulate organic | Particulate organic phosphorus in suspension |
| Phosphorus, phosphate (PO4) | Phosphate phosphorus |
| Phosphorus, phosphate flux | Phosphate (PO4) flux |
| Phosphorus, polyphosphate | Polyphosphate Phosphorus |
| Phosphorus, total | Total Phosphorus |
| Phosphorus, total dissolved | Total dissolved phosphorus |
| Phytane | Phyane, a type of diterpenoid alkane, formula : C20H42. Synonyms: 2,6,10,14-Tetramethylhexadecane |
| Phytoplankton | Measurement of phytoplankton with no differentiation between species |
| Piperonyl Butoxide | Piperonyl Butoxide (C19H30O5) |
| Polycyclic aromatic hydrocarbon, alkyl | Polycyclic aromatic hydrocarbon (PAH) having at least one alkyl sidechain (methyl, ethyl or other alkyl group) attached to the aromatic ring structure |
| Polycyclic aromatic hydrocarbon, parent | Unsubstituted (i.e., non-alkylated) polycyclic aromatic hydrocarbon (PAH) |
| Polycyclic aromatic hydrocarbon, total | total polycyclic aromatic hydrocarbon (PAH), also known as poly-aromatic hydrocarbons or polynuclear aromatic hydrocarbons |
| Position | Position of an element that interacts with water such as reservoir gates |
| Potassium, dissolved | Dissolved Potassium (K) |
| Potassium, total | Total Potassium (K) |
| Prasinoxanthin | Prasinoxanthin, C40H56O4 |
| Precipitation | Precipitation such as rainfall. Should not be confused with settling. |
| Pressure, absolute | Pressure |
| Pressure, gauge | Pressure relative to the local atmospheric or ambient pressure |
| Primary productivity | Primary Productivity |
| Primary productivity, gross | Rate at which an ecosystem accumulates energy by fixation of sunlight, including that consumed by the ecosystem. |
| Priority Pollutant PAH | The original 16 PAH compounds that the United States Environmental Protection Agency (EPA) has designated as priority pollutants: naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benzo[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, dibenz(ah)anthracene, benzo[ghi]perylene, and indeno[1,2,3-cd]pyrene. |
| Pristane | Pristane, a natural or synthetic isoprenoid hydrocarbon (C19) derivative, formula : C19H40. Synonyms: 2,6,10,14-Tetramethylpentadecane |
| Program signature | A unique data recorder program identifier which is useful for knowing when the source code in the data recorder has been modified. |
| Pronamide | Pronamide (C12H11Cl2NO) |
| Propane | Propane |
| Propane, dissolved | Dissolved Propane (C3H8) |
| Propanoic acid | Propanoic acid (C3H6O2) |
| Propylene glycol | Propylene glycol (C3H8O2) |
| Pyrene | Pyrene (C16H10), a polycyclic aromatic hydrocarbon (PAH) |
| Pyridine | Pyridine (C5H5N) |
| Pyropheophorbide a | Pyropheophorbide a, C33H34N4O3 |
| Radiation, incoming | Incoming radiation |
| Radiation, incoming longwave | Incoming Longwave Radiation |
| Radiation, incoming PAR | Incoming Photosynthetically-Active Radiation |
| Radiation, incoming shortwave | Incoming Shortwave Radiation |
| Radiation, incoming UV-A | Incoming Ultraviolet A Radiation |
| Radiation, incoming UV-B | Incoming Ultraviolet B Radiation |
| Radiation, net | Net Radiation |
| Radiation, net longwave | Net Longwave Radiation |
| Radiation, net PAR | Net Photosynthetically-Active Radiation |
| Radiation, net shortwave | Net Shortwave radiation |
| Radiation, outgoing longwave | Outgoing Longwave Radiation |
| Radiation, outgoing PAR | Outgoing Photosynthetically-Active Radiation |
| Radiation, outgoing shortwave | Outgoing Shortwave Radiation |
| Radiation, total incoming | Total amount of incoming radiation from all frequencies |
| Radiation, total outgoing | Total amount of outgoing radiation from all frequencies |
| Radiation, total shortwave | Total Shortwave Radiation |
| Radium-226 | An isotope of radium in the uranium-238 decay series |
| Radium-228 | An isotope of radium in the thorium-232 decay series |
| Radon-222 | An isotope of radon |
| Rainfall rate | A measure of the intensity of rainfall, calculated as the depth of water to fall over a given time period if the intensity were to remain constant over that time interval (in/hr, mm/hr, etc) |
| Real dielectric constant | Soil reponse of a reflected standing electromagnetic wave of a particular frequency which is related to the stored energy within the medium. This is the real portion of the complex dielectric constant. |
| Recorder code | A code used to identifier a data recorder. |
| Reduction potential | Oxidation-reduction potential |
| Relative humidity | Relative humidity |
| Remark | Manually added comment field to provide additional information about a particular record. |
| Reservoir storage | Reservoir water volume |
| Respiration, ecosystem | Gross carbon dioxide production by all organisms in an ecosystem. Ecosystem respiration is the sum of all respiration occurring by the living organisms in a specific ecosystem. |
| Respiration, net | Net respiration |
| Retene | Retene (C18H18), a polycyclic aromatic hydrocarbon (PAH), also known as methyl isopropyl phenanthrene or 1-methyl-7-isopropyl phenanthrene |
| Rhenium, total | Total Rhenium (Re) |
| Rubidium to Strontium molar ratio | Rubidium to Strontium (Rb:Sr) molar ratio |
| Rubidium, dissolved | Dissolved Rubidium (Rb) |
| Ruthenium-106 | The most stable isotope of ruthenium with a half life of 373.59 days. |
| Salicornia bigelovii coverage | Areal coverage of the plant Salicornia bigelovii |
| Salicornia virginica coverage | Areal coverage of the plant Salicornia virginica |
| Salinity | Salinity |
| Sand, total | Total sand |
| Sap flow | movement of xylem sap in trees |
| Saturated petroleum hydrocarbon, total | Total saturated petroleum hydrocarbon, i.e., total SHC |
| Secchi depth | Secchi depth |
| Sediment, passing sieve | The amount of sediment passing a sieve in a gradation test |
| Sediment, retained on sieve | The amount of sediment retained on a sieve in a gradation test |
| Sediment, suspended | Suspended Sediment |
| Selenium, dissolved | Dissolved selenium (Se). For chemical terms, dissolved indicates a filtered sample. |
| Selenium, distribution coefficient | Ratio of concentrations of selenium in two phases in equilibrium with each other. Phases must be specified. |
| Selenium, particulate | Particulate selenium (Se) in suspension |
| Selenium, total | Total Selenium (Se). For chemical terms, total indicates an unfiltered sample |
| Sensible heat flux | Sensible Heat Flux |
| Sequence number | A counter of events in a sequence |
| Shannon diversity index | A diversity index that is based on the number of taxa, and the proportion of individuals in each taxa relative to the entire community, evaluated as entropy.
Also known as Shannon-Weaver diversity index, the Shannon-Wiener index, the Shannon index and the Shannon entropy. |
| Shannon evenness index | A dimensionless diversity index, calculated as a ratio of the Shannon diversity index over its maximum. Also known as the Shannon Weaver evenness index |
| Sigma-t | Density of seawater calculated with in situ salinity and temperature, but pressure equal to zero, rather than
the in situ pressure, and 1000 kg/m^3 is subtracted. Defined as (S,T)-1000 kg m-3, where (S,T) is the density of a sample of seawater at temperature T and salinity S, measured in kg m-3, at standard atmospheric pressure. |
| Signal-to-noise ratio | Signal-to-noise ratio (often abbreviated SNR or S/N) is defined as the ratio of a signal power to the noise power corrupting the signal. The higher the ratio, the less obtrusive the background noise is. |
| Silica | Silica (SiO2) |
| Silica, dissolved | Dissolved silica (SiO2) |
| Silicate | Silicate. Chemical compound containing silicon, oxygen, and one or more metals, e.g., aluminum, barium, beryllium, calcium, iron, magnesium, manganese, potassium, sodium, or zirconium. |
| Silicic acid | Hydrated silica disolved in water |
| Silicic acid flux | Silicate acid (H4SiO4) flux |
| Silicon | Silicon (Si) |
| Silicon, dissolved | Dissolved Silicon (Si) |
| Silicon, particulate | Particulate silicon (Si) in suspension |
| Silt, total | Total silt |
| Silver, dissolved | Dissolved silver (Ag). For chemical terms, dissolved indicates a filtered sample. |
| Silver, total | Total Silver (Ag). For chemical terms, total represents an unfiltered sample. |
| Slope | Ratio between two variables in a linear relationship. |
| Snow depth | Snow depth |
| Snow water equivalent | The depth of water if a snow cover is completely melted, expressed in units of depth, on a corresponding horizontal surface area. |
| Sodium adsorption ratio | Sodium adsorption ratio |
| Sodium plus potassium | Sodium plus potassium |
| Sodium, dissolved | Dissolved Sodium (Na) |
| Sodium, fraction of cations | Sodium, fraction of cations |
| Sodium, total | Total Sodium (Na) |
| Solids, fixed dissolved | Fixed Dissolved Solids |
| Solids, fixed suspended | Fixed Suspended Solids |
| Solids, total | Total Solids |
| Solids, total dissolved | Total Dissolved Solids |
| Solids, total fixed | Total Fixed Solids |
| Solids, total suspended | Total Suspended Solids |
| Solids, total volatile | Total Volatile Solids |
| Solids, volatile dissolved | Volatile Dissolved Solids |
| Solids, volatile suspended | Volatile Suspended Solids |
| Spartina alterniflora coverage | Areal coverage of the plant Spartina alterniflora |
| Spartina spartinea coverage | Areal coverage of the plant Spartina spartinea |
| Specific conductance | Specific conductance |
| Speed of sound | Speed of sound in the medium sampled |
| Squalene | Squalene (C30H50) |
| Streamflow | The volume of water flowing past a fixed point. Equivalent to discharge |
| Streptococci, fecal | Fecal Streptococci |
| Strontium, dissolved | Dissolved Strontium (Sr) |
| Strontium, stable isotope ratio | Ratio of radiogenic Strontium to naturally occurring Strontium (Sr87:Sr86) |
| Strontium, total | Total Strontium (Sr) |
| Styrene | Styrene (C8H8) |
| Suaeda linearis coverage | Areal coverage of the plant Suaeda linearis |
| Suaeda maritima coverage | Areal coverage of the plant Suaeda maritima |
| Sulfate, dissolved | Dissolved Sulfate (SO4) |
| Sulfate, total | Total Sulfate (SO4) |
| Sulfide, dissolved | Dissolved Sulfide |
| Sulfide, total | Total sulfide |
| Sulfur | Sulfur (S) |
| Sulfur dioxide | Sulfur dioxide (SO2) |
| Sulfur, dissolved | Dissolved Sulfur (S) |
| Sulfur, organic | Organic Sulfur |
| Sulfur, pyritic | Pyritic Sulfur |
| Sunshine duration | Sunshine duration |
| Superoxide dismutase, activity | Superoxide dismutase (SOD) activity |
| Superoxide dismutase, delta cycle threshold | Delta cycle threshold for superoxide dismutase (sod). Cycle threshold is the PCR cycle number at which the fluorescent signal of the gene being amplified crosses the set threshold. Delta cycle threshold for sod is the difference between the cycle threshold (Ct) of sod gene expression and the cycle threshold (Ct) for the gene expression of the reference gene (e.g., beta-actin). |
| SUVA254 | Specific ultraviolet absorbance at 254 nm. Determined by absorbance normalized to DOC concentration. |
| Table overrun error count | A counter which counts the number of datalogger table overrun errors |
| Tactile Water Presence | A Boolean indicator for the tactile presence of water on the landscape or on the soil surface, as it feels to a human observer's touch. Typically this variable is employed for wet/dry mapping or citizen science efforts. |
| Taxa count | Count of unique taxa. A taxon (plural: taxa) is a group of one (or more) populations of organism(s), which is judged to be a unit. |
| TDR waveform relative length | Time domain reflextometry, apparent length divided by probe length. Square root of dielectric |
| Temperature | Temperature |
| Temperature change | temperature change |
| Temperature, datalogger | Temperature, raw data from datalogger |
| Temperature, dew point | Dew point temperature |
| Temperature, initial | initial temperature before heating |
| Temperature, sensor | Temperature, raw data from sensor |
| Temperature, transducer signal | Temperature, raw data from sensor |
| Temperature, wet-bulb | Temperature of air when cooled to saturation by evaporation of water |
| Terbufos | Terbufos (C9H21O2PS3) |
| Terpineol | Terpineol (C10H18O) |
| Tert-Amyl Methyl Ether | Tert-Amyl Methyl Ether (C6H14O) |
| Tertiary Butyl Alcohol | Tertiary Butyl Alcohol (C4H10O) |
| Tetracene | Tetracene (C18H12), a polycyclic aromatic hydrocarbon (PAH), also known as naphthacene or benz[b]anthracene |
| Tetrachloroethene | Tetrachloroethene (C2Cl4) |
| Tetraethylene glycol | Tetraethylene glycol (C8H18O5) |
| Tetrahydrofuran | Tetrahydrofuran (C4H8O) |
| Tetramethylnaphthalene | Tetramethylnaphthalene (C10H4(CH3)4), a polycyclic aromatic hydrocarbon (PAH) |
| Thallium, dissolved | Dissolved thallium (Tl). "dissolved" indicates measurement was made on a filtered sample. |
| Thallium, distribution coefficient | Ratio of concentrations of thallium in two phases in equilibrium with each other. Phases must be specified. |
| Thallium, particulate | Particulate thallium (Tl) in suspension |
| Thallium, total | Total thallium (Tl). "Total" indicates was measured on a whole water (unfiltered) sample. |
| Thorium | Thorium (Th) |
| Thorium, dissolved | Dissolved thorium. For chemical terms, dissolved indicates a filtered sample. |
| Thorium-228 | An isotope of thorium in the thorium-232 decay series |
| Thorium-230 | An isotope of thorium in the thorium-232 decay series |
| Thorium-232 | A radioactive isotope of thorium which undergoes alpha decay |
| Threshold | A level above or below which an action is performed. |
| THSW Index | The THSW Index uses temperature, humidity, solar radiation, and wind speed to calculate an apparent temperature. |
| THW Index | The THW Index uses temperature, humidity, and wind speed to calculate an apparent temperature. |
| Tide stage | Tidal stage |
| Time Stamp | The time at which a sensor produces output |
| Time, elapsed | Time elapsed since an event occurred |
| Tin, dissolved | Dissolved tin (Sn). "Dissolved " indicates a the measurement was made on a filtered sample. |
| Tin, total | Total tin (Sn)."Total" indicates was measured on a whole water (unfiltered) sample. |
| Titanium | Titanium (Ti) |
| Titanium, dissolved | Dissolved Titanium |
| Tm-17a(H),21b(H)-22,29,30-Trisnorhopane | Tm-17a(H),21b(H)-22,29,30-Trisnorhopane |
| Toluene | Toluene (C6H5CH3) |
| trans-1,2-Dichloroethene | trans-1,2-Dichloroethene (C2H2Cl2) |
| trans-1,3-Dichloropropene | trans-1,3-Dichloropropene (C3H4Cl2) |
| Transient species coverage | Areal coverage of transient species |
| Transpiration | Transpiration |
| Tributoxyethyl phosphate | Tributoxyethyl phosphate (C42H87O13P) |
| Trichloroethene | Trichloroethene (C2HCl3) |
| Triethylene glycol | Triethylene glycol (C6H14O4) |
| Trifluralin | Trifluralin (C13H16F3N3O4) |
| Triphenylene | Triphenylene (C18H12) |
| Tritium (3H), Delta T of H2O | Isotope 3H of water |
| Ts-18a(H),21b(H)-22,29,30-Trisnorhopane | Ts-18a(H),21b(H)-22,29,30-Trisnorhopane |
| TSI | Carlson Trophic State Index is a measurement of eutrophication based on Secchi depth |
| Turbidity | Turbidity |
| Uranium | Uranium (U) |
| Uranium, dissolved | Dissolved Uranium. For chemical terms, dissolved indicates a filtered sample. |
| Uranium-234 | An isotope of uranium in the uranium-238 decay series |
| Uranium-235 | An isotope of uranium that can sustain fission chain reaction |
| Uranium-238 | Uranium's most common isotope |
| Urea | Urea ((NH2)2CO) |
| Urea flux | Urea ((NH2)2CO) flux |
| Vanadium, dissolved | Dissolved vanadium (V). "Dissolved" indicates the measurement was made on a filtered sample. |
| Vanadium, particulate | Particulate vanadium (V) in suspension |
| Vanadium, total | Total vanadium (V). "Total" indicates was measured on a whole water (unfiltered) sample. |
| Vapor pressure | The pressure of a vapor in equilibrium with its non-vapor phases |
| Vapor pressure deficit | The difference between the actual water vapor pressure and the saturation of water vapor pressure at a particular temperature. |
| Velocity | The velocity of a substance, fluid or object |
| Visibility | Visibility |
| Visible Water Presence | A Boolean indicator for the visible presence of water on the landscape or on the soil surface, as it appears to a human observer's eyes. Typically this variable is employed for wet/dry mapping or citizen science efforts. |
| Voltage | Voltage or Electrical Potential |
| Volume | Volume. To quantify discharge or hydrograph volume or some other volume measurement. |
| Volumetric water content | Volume of liquid water relative to bulk volume. Used for example to quantify soil moisture |
| Watchdog error count | A counter which counts the number of total datalogger watchdog errors |
| Water column equivalent height, absolute | The absolute pressure (combined water + barometric) on a sensor expressed as the height of an equivalent column of water. |
| Water column equivalent height, barometric | Barometric pressure expressed as an equivalent height of water over the sensor. |
| Water Content | Quantity of water contained in a material or organism |
| Water depth | Water depth is the distance between the water surface and the bottom of the water body at a specific location specified by the site location and offset. |
| Water depth, averaged | Water depth averaged over a channel cross-section or water body. Averaging method to be specified in methods. |
| Water flux | Water Flux |
| Water level | Water level relative to datum. The datum may be local or global such as NGVD 1929 and should be specified in the method description for associated data values. |
| Water potential | Water potential is the potential energy of water relative to pure free water (e.g. deionized water) in reference conditions. It quantifies the tendency of water to move from one area to another due to osmosis, gravity, mechanical pressure, or matrix effects including surface tension. |
| Water Presence | A Boolean indicator for the presence of water on the landscape or on the soil surface, in excess of a detection threshold, as indicated by a sensor |
| Water Use, Agriculture | Water pumped for Agriculture |
| Water Use, Aquaculture | Water use associated with the farming of finfish, shellfish, and other organisms that live in water, and offstream water use associated with fish hatcheries.
This term and definition are used in the USGS high level Water-Use Categories.
https://water.usgs.gov/watuse/WU-Category-Changes.html |
| Water Use, Commercial | Water for motels, hotels, restaurants, office buildings, other commercial facilities, military and nonmilitary institutions, and (for 1990 and 1995) offstream fish hatcheries. Water may be obtained from a public-supply system or may be self-supplied. Commercial water-use estimates were included in industrial water use until 1985, then were reported as a separate category.
This term and definition are used in the USGS high level Water-Use Categories.
https://water.usgs.gov/watuse/WU-Category-Changes.html |
| Water Use, Commercial + Industrial + Power | Water pumped by commercial, industrial users. |
| Water Use, Conveyance Loss | Water that is lost in transit from a pipe, canal, conduit, or ditch by leakage or evaporation. Leakage from an irrigation ditch, for example, may percolate to a groundwater source and be available for further use.
This term and definition are used in the USGS high level Water-Use Categories.
https://water.usgs.gov/watuse/WU-Category-Changes.html |
| Water Use, Domestic | Water used for indoor household purposes such as drinking, food preparation, bathing, washing clothes and dishes, flushing toilets, and outdoor purposes such as watering lawns and gardens. Domestic water use includes potable and non-potable water provided to households by a public water supplier (domestic deliveries) and self-supplied water.
This term and definition are used in the USGS high level Water-Use Categories.
https://water.usgs.gov/watuse/WU-Category-Changes.html |
| Water Use, Domestic wells | Water pumped by domestic wells; residents and landowners not using public supply. Nonagriculture wells. |
| Water Use, Hydroelectric Power | The use of water in the generation of electricity at plants where the turbine generators are driven by moving water. Hydroelectric water use is most commonly an instream use.
This term and definition are used in the USGS high level Water-Use Categories.
https://water.usgs.gov/watuse/WU-Category-Changes.html |
| Water Use, Industrial | Water used for fabrication, processing, washing, and cooling. Includes industries such as chemical and allied products, food, mining, paper and allied products, petroleum refining, and steel.
This term and definition are used in the USGS high level Water-Use Categories.
https://water.usgs.gov/watuse/WU-Category-Changes.html |
| Water Use, Livestock | Water used for livestock watering, feedlots, dairy operations, and other on-farm needs. Types of livestock include dairy cows and heifers, beef cattle and calves, sheep and lambs, goats, hogs and pigs, horses and poultry.
This term and definition are used in the USGS high level Water-Use Categories.
https://water.usgs.gov/watuse/WU-Category-Changes.html |
| Water Use, Public Supply | Water withdrawn by public and private water suppliers that furnish water to at least 25 people or have a minimum of 15 connections. Public suppliers provide water for a variety of uses, such as domestic, commercial, industrial, thermoelectric-power, and public water use. See also commercial water use, domestic water use, industrial water use, public-supply deliveries, public water use, and thermoelectric-power water use.
This term and definition are used in the USGS high level Water-Use Categories.
https://water.usgs.gov/watuse/WU-Category-Changes.html |
| Water Use, Recreation | Recreational water use, for example golf courses. |
| Water Use, Thermoelectric power | Water used in the process of generating electricity with steam-driven turbine generators. Term used in previous water-use circulars to describe the combined public-supply deliveries to thermoelectric-power plants and self-supplied thermoelectric-power withdrawals.
This term and definition are used in the USGS high level Water-Use Categories.
https://water.usgs.gov/watuse/WU-Category-Changes.html |
| Water vapor concentration | Water vapor concentration |
| Water vapor density | Water vapor density |
| Wave height | The height of a surface wave, measured as the difference in elevation between the wave crest and an adjacent trough. |
| Weather conditions | Weather conditions |
| Well flow rate | Flow rate from well while pumping |
| Wellhead pressure | The pressure exerted by the fluid at the wellhead or casinghead after the well has been shut off for a period of time, typically 24 hours |
| Wind chill | The effect of wind on the temperature felt on human skin. |
| Wind direction | Wind direction |
| Wind gust direction | Direction of gusts of wind |
| Wind gust speed | Speed of gusts of wind |
| Wind Run | The length of flow of air past a point over a time interval. Windspeed times the interval of time. |
| Wind speed | Wind speed |
| Wind stress | Drag or trangential force per unit area exerted on a surface by the adjacent layer of moving air |
| Wrack coverage | Areal coverage of dead vegetation |
| Xylenes, total | Total xylenes: C6H4(CH3)2 |
| Zeaxanthin | The phytoplankton pigment Zeaxanthin |
| Zinc, dissolved | Dissolved Zinc (Zn) |
| Zinc, distribution coefficient | Ratio of concentrations of zinc in two phases in equilibrium with each other. Phases must be specified. |
| Zinc, particulate | Particulate zinc (Zn) in suspension |
| Zinc, total | Total zinc (Zn)."Total" indicates was measured on a whole water (unfiltered) sample. |
| Zircon, dissolved | Dissolved Zircon (Zr) |
| Zirconium, dissolved | Dissolved Zirconium |
| Zirconium-95 | A radioactive isotope of zirconium with a half-life of 63 days |
| Zooplankton | Zooplanktonic organisms, non-specific |
