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Résumé :
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This manual describes procedures for characterizing the physical/chemical nature of toxicants in acutely toxic effluent samples. To detect the presence and potency of the toxicants as the sample is manipulated the measurement of toxicity using organisms is essential. The final stop is to separate the toxicants from other sample constituents to simplify the analytical process. Usually the toxicants must be concentrated for analysis. Sample manipulations to alter toxicity include sparging, PH, changes, filtration, solid phase extraction and addition of chelating and reducing agents. The results will often reveal information about the physical/chemical characteristics of the toxicants. Subsequent manuals in preparation describe methods to specifically identify the toxicants and to confirm that the suspected constituents are the true toxicants.
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