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Role of Humic Carrier Substances in DDT Movement through Forest Soil¹

ABSTRACT

In DDT-treated forest floor columns, over 30 times as much DDT was recovered by leaching with water when urea was added to disperse the humic acids. Using similar treatment and analysis, alundum tension lysimeters in soil 2 cm below the forest floor yielded no detectable levels of DDT. In DDT-treated humic extracts, 91% of added o,p'-DDT was recovered in humic acids and 9% in fulvic acids plus water.

¹ Contribution from College of Forest Resources, University of Washington, Seattle. Research supported by a grant from the US Forest Service.

² Formerly, Research Associate, College of Forest Resources, University of Washington; presently, Assistant Professor, Department of Soil Science and Faculty of Forestry, University of British Columbia, Vancouver, Canada.

Received for publication July 6, 1970. Accepted for publication October 5, 1970.