| Term | Definition |

| Ag | Expressed as silver |

| Al | Expressed as aluminium |

| As | Expressed as arsenic |

| B | Expressed as boron |

| Ba | Expressed as barium |

| Be | Expressed as beryllium |

| Br | Expressed as bromine |

| C | Expressed as carbon |

| C10H10O4 | Expressed as dimethyl terephthalate |

| C10H4(CH3)4 | Expressed as tetramethylnaphthalene |

| C10H5(CH3)3 | Expressed as trimethylnaphthalene |

| C10H6(CH3)2 | Expressed as dimethylnaphthalene |

| C10H7C2H5 | Expressed as ethylnaphthalene |

| C10H7CH3 | Expressed as methylnaphthalene |

| C10H8 | Expressed as naphthalene |

| C12H10 | Expressed as C12H10, e.g., acenaphthene, biphenyl |

| C12H14O4 | Expressed as diethyl phthalate |

| C12H8 | Expressed as acenaphthylene |

| C12H8O | Expressed as dibenzofuran |

| C12H8S | Expressed as dibenzothiophene |

| C12H9N | Expressed as carbazole |

| C13H10 | Expressed as fluorene |

| C13H10S | Expressed as methyldibenzothiophene |

| C14H10 | Expressed as phenanthrene |

| C14H12 | Expressed as methylfluorene |

| C15H12 | Expressed as C15H12, e.g., methylphenanthrene, Methylanthracene |

| C15H32 | Expressed as C15 n-alkane |

| C16H10 | Expressed as C16H10, e.g., fluoranthene, pyrene |

| C16H14 | Expressed as dimethylphenanthrene |

| C16H34 | Expressed as C16 n-alkane |

| C17H12 | Expressed as C17H12, e.g., benzo(a)fluorene, methylfluoranthene, methylpyrene |

| C17H36 | Expressed as C17 n-alkane |

| C18H12 | Expressed as C18H12, e.g., benz(a)anthracene, chrysene, triphenylene |

| C18H18 | Expressed as retene |

| C18H38 | Expressed as C18 n-alkane |

| C19H14 | Expressed as methylchrysene |

| C19H20O4 | Expressed as benzyl butyl pththalate |

| C19H40 | Expressed as C19 n-alkane |

| C20H12 | Expressed as C20H12, e.g., benzo(b)fluoranthene, benzo(e)pyrene, perylene |

| C20H42 | Expressed as C20 n-alkane |

| C21H44 | Expressed as C21 n-alkane |

| C22H14 | Expressed as Dibenz(a,h)anthracene |

| C22H46 | Expressed as C22 n-alkane |

| C23H48 | Expressed as C23 n-alkane |

| C24H50 | Expressed as C24 n-alkane |

| C25H52 | Expressed as C25 n-alkane |

| C26H54 | Expressed as C26 n-alkane |

| C27H56 | Expressed as C27 n-alkane |

| C28H58 | Expressed as C28 n-alkane |

| C29H60 | Expressed as C29 n-alkane |

| C2Cl4 | Expressed as tetrachloroethylene |

| C2Cl6 | Expressed as hexachloroethane |

| C2H2Cl4 | Expressed as tetrachloroethane |

| C2H3Cl | Expressed as vinyl chloride |

| C2H3Cl3 | Expressed as trichloroethane |

| C2H4Cl2 | Expressed as dichloroethane |

| C2H5Cl | Expressed as chloroethane |

| C2H6 | Expressed as ethane |

| C2H6O2 | Expressed as Ethylene glycol |

| C2HCl3 | Expressed as trichloroethylene |

| C31H64 | Expressed as C31 n-alkane |

| C3H6O | Expressed as acetone |

| C4Cl6 | Expressed as hexchlorobutadiene |

| C4H8Cl2O | Expressed as bis(chloroethyl) ether |

| C4H8O | Expressed as butanone |

| C5Cl6 | Expressed as hexachlorocyclopentadiene |

| C6Cl6 | Expressed as hexachlorobenzene |

| C6H3Cl3 | Expressed as trichlorobenzene |

| C6H4(CH3)2 | Expressed as xylenes |

| C6H4Cl2 | Expressed as dichlorobenzene |

| C6H4N2O5 | Expressed as dinitrophenol |

| C6H5Cl | Expressed as chlorobenzene |

| C6H5NH2 | Expressed as aniline |

| C6H5NO2 | Expressed as nitrobenzene |

| C6H5OH | Expressed as phenol |

| C6H6 | Expressed as benzene |

| C6HCl5O | Expressed as pentachlorophenol |

| C7H6N2O4 | Expressed as dinitrotoluene |

| C7H8 | Expressed as Toluene |

| C8H10 | Expressed as ethylbenzene |

| C8H8 | Expressed as styrene |

| C9H14O | Expressed as isophorone |

| Ca | Expressed as calcium |

| CaCO3 | Expressed as calcium carbonate |

| Cd | Expressed as cadmium |

| CH2Cl2 | Expressed as dichloromethane |

| CH3Br | Expressed as bromomethane |

| CH3Cl | Expressed as chloromethane |

| CH3Hg | Expressed at methylmercury |

| CH4 | Expressed as methane |

| CHBr2Cl | Expressed as dibromochloromethane |

| CHBr3 | Expressed as bromoform |

| CHBrCl2 | Expressed as bromodichloromethane |

| CHCl3 | Expressed as chloroform |

| Chlorophyll a | Expressed as chlorophyll a |

| Cl | Expressed as chlorine |

| CN- | Expressed as cyanide |

| Co | Expressed as cobalt |

| CO2 | Expressed as carbon dioxide |

| CO3 | Expressed as carbonate |

| Cr | Expressed as chromium |

| Cu | Expressed as copper |

| delta 2H | Expressed as deuterium |

| delta N15 | Expressed as nitrogen-15 |

| delta O18 | Expressed as oxygen-18 |

| EC | Expressed as electrical conductivity |

| F | Expressed as fluorine |

| Fe | Expressed as iron |

| H2O | Expressed as water |

| HCO3 | Expressed as hydrogen carbonate |

| Hg | Expressed as mercury |

| K | Expressed as potassium |

| Mg | Expressed as magnesium |

| Mn | Expressed as manganese |

| Mo | Expressed as molybdenum |

| N | Expressed as nitrogen |

| Na | Expressed as sodium |

| NH4 | Expressed as ammonium |

| Ni | Expressed as nickel |

| NO2 | Expressed as nitrite |

| NO3 | Expressed as nitrate |

| Not Applicable | Speciation is not applicable |

| O2 | Expressed as oxygen (O2) |

| P | Expressed as phosphorus |

| Pb | Expressed as lead |

| pH | Expressed as pH |

| PO4 | Expressed as phosphate |

| QSE | Expressed as quinine sulfate equivalents |

| Ra | Expressed as Radium. Also known as "radium equivalent." The radium equivalent concept allows a single index or number to describe the gamma output from different mixtures of uranium (i.e., radium), thorium, and 40K in a material. |

| Re | Expressed as rhenium |

| S | Expressed as Sulfur |

| Sb | Expressed as antimony |

| Se | Expressed as selenium |

| Si | Expressed as silicon |

| SiO2 | Expressed as silicate |

| Sn | Expressed as tin |

| SO4 | Expressed as Sulfate |

| Sr | Expressed as strontium |

| TA | Expressed as total alkalinity |

| Th | Expressed as thorium |

| Ti | Expressed as titanium |

| Tl | Expressed as thallium |

| U | Expressed as uranium |

| Unknown | Speciation is unknown |

| V | Expressed as vanadium |

| Zn | Expressed as zinc |

| Zr | Expressed as zirconium |