biology - free floating microscopic aquatic plants and animals

regulatory - the National Environmental Policy Act of 1969, 42 U.S.C §§ 4321-4370c; the federal environmental law that established the Council on Environmental Quality and requires federal agencies to formally consider environmental impacts of planned actions or decisions potentially affecting the quality of the human environment

biology/toxicology - referring to a chemical compound or environmental influence that causes developmental defects

chemistry - atomic absorption, a spectrophotometric instrumental method used to analyze for trace elements

chemistry - atomic absorption spectrophotometer

chemistry - the atomic process whereby an atom or molecule absorbs energy at a given wavelength, causing an electron to move to a higher-energy orbital; the opposite of emission; this term should not be confused with adsorption.

statistics/quality assurance - the closeness of a measured value to the true value

English unit for land area (see unit conversion factors)

English volume unit for water, 1 acre-ft = 1,233.5 m3 = 325,851 gallons, (see unit conversion factors)

American Chemical Society