The Rate of Leaching of Dieldrin from Attapulgite Clay Granules1

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Abstract
Formulations of 30/40 mesh attapulgite clay granules containing 10% dieldrin applied as a solution in zylene, a heavy aromatic hydrocarbon, or a non-hydrocarbon solvent (mixture of diethylene glycol and water) were leached with water to determine the role of solvents in affecting the tenacity of the insecticide. Weighed undried and dried samples were leached continuously for 32 days with samples being taken initially and at intervals of 1, 2, 4, 8, 16, and 32 days. The dieldrin content of the leachate was determined with a bioassay procedure using Aedes aegypti (L.) larvae. The undried xylene samples allowed a much higher initial release of dieldrin than any other of the undried or dried solvents used. A large reduction in release of dieldrin resulted with all solvents between the first 200-ml. sample and the sample taken at the end of the first day. After the first 200-ml. sample there was very little difference in the ppm of dieldrin released by leaching with water, due either to solvent used or to the evaporation of the solvent after formulation.

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