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Retention of Three Insecticides on Different Size Soil Particles Suspended in Water¹

ABSTRACT

Studies were made to determine the retention of DDT, endosulfan and methoxychlor on different sized soil particles. The two soils used were Marshall silt loam from Iowa and Caribou silt loam from Maine. A portion of each soil was treated with H₂O₂ to study the effect of organic matter on pesticide retention.

Retention of DDT and methoxychlor was highest in the clay fraction of both treated and untreated soils. In the untreated soils the greatest retention of the three insecticides was on the colloidal (<0.08 µ) and 0.08–0.5 µ fraction. Removing the organic matter from both soils reduced the retention on the <0.08 µ and 0.08–0.5 µ clay fractions.

The two soils reacted differently to the H₂O₂ treatment, although the three insecticides followed very similar trends within a soil. It appears that although organic matter contributes to the retention of the insecticides studied, other soil properties also are responsible for adsorption.

¹ Contribution from the Soil and Water Conserv. Res. Div., ARS, USDA, the Maine Agr. Exp. Sta., Dep. of Plant and Soil Sciences and the Water Resources Center, University of Maine, Orono 04473. This project is supported in part by funds provided by the US Dep. of Interior as authorized under the Water Resources Research Act of 1964, Public Law 88-379.

² Former Research Assistant, University of Maine, now Pesticide Residue Analyst, Public Health Laboratory, Department of Health and Welfare, State House, Augusta, Maine; and Soil Scientist, USDA, respectively.

Received for publication December 17, 1970. Accepted for publication June 21, 1971.