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Multi element analysis of animal feed animal wastes and sewage sludge



Multi element analysis of animal feed animal wastes and sewage sludge



Environmental Science and Technology 12(7): 785-790



Animal excreta and sewage sludge are currently being used as animal feed ingredients on an experimental basis. The levels of 30 elements are reported for a typical cattle feedlot diet, 2 dried cattle manures, a commercial cattle waste product, 2 dried poultry manures and a metropolitan sewage sludge. The analyses are conducted using neutron activation analysis, induction coupled plasma spectroscopy, atomic absorption spectroscopy and anodic stripping voltammetry. The levels of most inorganic elements are considerably higher in animal wastes and sewage sludge than in traditional animal feeds. For most elements, the levels determined by several techniques are in good agreement. Problems of loss of Pb with precipitate formation, accurate quantitation of elements present at high levels and obtaining homogeneous samples for analysis are discussed.

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