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Adsorption of DDT on Solid Particles¹

ABSTRACT

DDT adsorption from water by ion exchange resins, aluminum oxides, ion exchange celluloses, and soils was determined by measuring carbon-14 labeled DDT remaining in solution. The positively charged adsorbents adsorbed more DDT from solution than the negatively charged adsorbents. In addition, the association of DDT with organic matter and colloidal clay in the aqueous phase resulting from sedimented soils increased DDT in solution.

The chlorine atoms on the ethyl group of the DDT molecule possess a slight negative charge which appeared mainly responsible for the adsorption of DDT.

¹ Contribution from Northern Plains Branch, Soil and Water Conservation Research Division, ARS, USDA, in cooperation with Colorado Agr. Exp. Sta. Scientific Journal Series 1398.

² Soil Scientist, and Research Investigations Leader, respectively, USDA, Plant Science Bldg., Colorado State Univ., Ft. Collins 80521.

Received for publication November 2, 1970. Accepted for publication July 30, 1971.