The Determination of Some Insecticidal Residues in Soils by Bioassay1

Abstract
Soil samples having received heavy applications of DDT, toxaphene, dieldrin and BHC were bioassayed for residues. Extracts were obtained from 0 to 3 and 3 to 6 inch levels by use of a 4: 1 solution of hexane and acetone. A photomigration technique, employing the use of mosquito larvae, was followed for making the analyses. A comparison is made of the amounts of residues of the insecticides recovered.

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