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Optimal Solid-to-Solution Ratios for Organic Chemical Sorption Experiments

Department of Agronomy, Univ. of Kentucky, Lexington, KY 40546-0091

* Corresponding author.

ABSTRACT

The presence of organic chemicals in natural systems requires an understanding of how these chemicals distribute themselves between the different phases of the environment. Partition coefficients (K) then are an important parameter for environmental fate studies. One experimentally critical parameter in the estimation of K for solid-liquid systems is the solid-to-solution ratio. Recommendations for a solid-to-solution ratio have ranged widely. Our objective was to derive a relationship for the variance of K, based on the analytical precision of the experimental variables, that could be used to determine the optimal solid-to-solution ratio for linear and Freundlich-type partitioning. The optimal solid-to-solution ratio occurred at 55% sorption for linear and Freundlich partitioning when the Freundlich constant was between 0.8 and 1.

Contribution from the Dep. of Agronomy, Univ. of Kentucky Agric. Exp. Stn., This investigation (no. 96-06-208) was conducted in connection with a project of the Kentucky Agric. Exp. Stn. and is published with the approval of the director.

Received for publication November 25, 1996.