Epoxidation of Aldrin and Heptachlor in Soils As Influenced by Autoclaving, Moisture, and Soil Types12

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Abstract
Aldrin was applied to Quartz sand, Plainfield sand, Carrington loam and muck soils in order to study its persistence and epoxidation. In addition autoclaved-wet and nonautoclaved dry sand and loam soils were used. Aldrin was readily transformed into dieldrin in a wet-nonautoclaved Carrington loam, but less rapidly so in a muck soil. The amounts of aldrin and dieldrin recovered from aldrin-treated Carrington loam soils were equal 3.3 months after treatment under laboratory conditions at 37• C. and 16 months after treatment under field conditions. In soils containing a low number of microorganisms (autoc1aved loam, Plainfield sand) or in dry soils the amount of dieldrin formed was small. After heptachlor had been applied to a Carrington loam it was found that this insecticide persisted slightly longer than aldrin, but the amount of heptachlorepoxide formed was smaller than that of dieldrin. A similar study on lindane persistence in a Miami silt loam is also reported.

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