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Pesticide Adsorption Measurement by Flow Equilibration and Subsequent Displacement¹

ABSTRACT

Adsorption of pesticides from solution was measured by continuous-flow equilibration and subsequent displacement from the soil by organic solvents. This new method and the conventional batch-equilibration method gave similar results for adsorption of diuron and atrazine on three surface soils. The flow method gave superior precision to the batch method on the subsoils studied. The new procedure is well adapted to studies of adsorption reversibility and also has the advantage of limited destruction of soil aggregates during equilibration.

¹ Joint contribution from the Savannah River Lab., E. I. du Pont de Nemours & Co., Aiken, S.C. 29801 and the Univ. of Hawaii, Honolulu, Hawaii 96822. Journal Series no. 1206 of the Hawaii Agr. Exp. Sta. The information contained in this article was developed during the course of work under Contract AT(07-2)-1 with the US Atomic Energy Commission.

² Associate Professor of Soil Science, Univ. of Hawaii, and Research Physicist, Savannah River Lab. The work was done while the senior author was an Oak Ridge Associated Universities Research Participant at the Savannah River Lab.

Received for publication June 29, 1970. Accepted for publication April 5, 1971.