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Extraction of Chlorinated Hydrocarbon Insecticides from Soils¹

A Soxhlet procedure is described for the quantitative extraction from soils of -BHC, aldrin, dieldrin, heptachlor epoxide, p,p'-DDD, p,p'-DDT, and methoxychlor in mixtures containing all these insecticides. On prolonged equilibration (30 days) of the insecticides with soil, indicatons of -BHC and aldrin degradation were noted. When soils were incubated in sealed containers to restrict O₂ availability the rates of -BHC and aldrin degradation were enhanced. No effect of soil H₂O content at the time of incubation or extraction on the efficiency of the extraction procedure was found.

Key Words: -BHC • aldrin • dieldrin • heptachlor epoxide • p,p'-DDD • p,p'-DDT • methoxychlor • gas chromatography

² Contribution from the Department of Soils, University of Wisconsin, Madison, Wis. 53706. Published with the approval of the Director, Wisconsin Agr. Exp. Sta. Supported in part by the Agricultural Research Service of the U.S. Department of Agriculture under Contract No. 12-14-100-8154 (41).

Received for publication December 9, 1967.