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<br />0181 <br /> <br />were composited into each sample. Aquatic plants, exclusive of roots, were <br />collected by hand and were rinsed free of inorganic debris with site water <br />before placing in a sample container. All inorganic samples were placed in <br />either chemically-clean glass jars (bird livers and eggs) or plastic bags <br />(whole birds, fish, and crayfish). Samples for organic-compound analysis were <br />placed in chemically-clean glass jars (livers) or wrapped in aluminum foil <br />(whole fish). Samples were frozen onsite in dry ice, except for avian livers, <br />which were removed by dissection and frozen late in the day of collection. <br />Eggs were not frozen onsite but were refrigerated until the contents were <br />removed and frozen within a few days of collection. <br /> <br />Analytical Support <br /> <br />Water samples were analyzed at the U.S. Geological Survey National Water <br />Quality Laboratory in Arvada, Colo. Analyses were performed using analytical <br />procedures described by Fishman and Friedman (1985) and quality-assurance <br />practices described by Friedman and Erdman (1982). Bottom-sediment samples <br />were analyzed for inorganic constituents at the U.S. Geological Survey <br />Environmental Geochemistry Laboratory in Denver, Colo., using procedures <br />described by Severson and others (1987). The sediment samples were air dried <br />at the laboratory and passed through a 2-mm sieve. The samples then were <br />split, and one split from each sample was passed through a 0.062-mm sieve. <br />Analyses were performed on both size fractions. Pesticide residues in bottom <br />sediment were analyzed at the National Water Quality Laboratory using proce- <br />dures described by Wershaw and others (1987). These samples were washed <br />through a metal sieve at the sample site, and the less than 2-mm size fraction <br />was analyzed. <br /> <br />All biological specimens were analyzed following procedures and quality <br />assurance/quality control protocols prescribed by the U.S. Fish and Wildlife <br />Service's Patuxent Analytical Control Facility in Laurel, Md. (U.S. Fish and <br />Wildlife Service, 1985). Organic analyses of avian and fish samples from <br />reservoirs were analyzed at Mississippi State Chemical Laboratory at <br />Mississippi State University. The minimum reporting limit was 0.01 ~g/g wet <br />weight. Organic analyses of fish samples from stream sites were performed at <br />Texas A&M Research Foundation in College Station, Texas. The minimum reporting <br />limit was 0.05 ~g/g wet weight. Concentrations of organic compounds were <br />determined using organic solvent extraction followed by electron-capture gas <br />chromatography. Inorganic analyses of all June samples from reservoirs were <br />done at the Environmental Trace Substances Research Center in Columbia, <br />Missouri, and the August and October samples were analyzed at Hazelton <br />Laboratories America, Inc. in Madison, Wis. Reporting limits for elemental <br />constituents varied with the element and method used. The methods used for <br />inorganic analyses were: arsenic and selenium by hydride generation; mercury <br />by cold vapor reduction; and the remaining elements by inductively coupled <br />plasma emission spectroscopy (ICP). <br /> <br />27 <br />