Chlorinated hydrocarbon insecticides in suspended sediment and bottom material are extracted with acetone-hexane solvent, with the extractants added separately. Co-extractives, including polychlorinated biphenyls and polychlorinated naphthalenes, are isolated by adsorption chromatography. Sulfur is removed by precipitation. Mean recoveries from 8 spiked samples ranged from 75 to 99% for 9 chlorinated hydrocarbon insecticides. An average recovery of 97.9% was obtained for bottom material samples contaminated with chlorinated hydrocarbons. Recoveries were compared with those obtained by exhaustive extraction of the contaminated samples.
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Goerlitz et al. (1974) studied this question.