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Elimination of Aerobic Degradation During Characterization of Pesticide Adsorption—Desorption in Soil¹

ABSTRACT

Two methods for elimination of aerobic pesticide degradation during characterization of pesticide adsorption-desorption in soil were compared, using 2,4,5-T (2,4,5-trichlorophenoxyacetic acid) as the test compound. Steam sterilization of soil significantly decreased 2,4,5-T adsorption by soil, and degradation of 2,4,5-T became noticeable after three days of desorption. Conducting the adsorption-desorption process under a nitrogen atmosphere resulted in little change in 2,4,5-T adsorption characteristics and negligible degradation even after six days of desorption.

¹ Contribution from the Dep. of Agronomy and Soils, Washington State University, Pullman, WA 99164. Scientific Paper no. 6,002. College of Agriculture Research Center, Project no. 1,858.

² Former Graduate Research Assistant and Professor of Soils, respectively. The first Author is now Soil Scientist, Southern Weed Science Laboratory, USDA-ARS, Stoneville, MS 38776.

Received for publication August 24, 1981. Accepted for publication November 16, 1981.