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Empirical Prediction of Organic Pollutant Sorption in Natural Sediments¹

ABSTRACT

An empirical relationship between the octanol/water partition coefficients (K_ow) and sediment sorption coefficients (K_oc) was determined for nine chloro-s-triazine and dinitroaniline compounds. Results were compared with earlier work that reported an excellent correlation between K_ow and K_oc for polynuclear aromatic and chlorinated hydrocarbons. The more polar character of the present compounds, however, reduced the precision of estimating sorption from octanol/water partition coefficients. A fit of the combined data sets for a total of 19 compounds of widely varied properties (five orders of magnitude variation in solubility) yielded a relationship that should be useful for predicting simple partition coefficients (K_p) in a number of modeling and assessment applications. Reasonable estimates of K_p or K_oc can be obtained from a single determination of the octanol/water partition coefficient and knowledge of the organic carbon content of the sediment.

Key Words: triazines • dinitroanilines • physical sorption • octanol/water partitioning

¹ Contribution of the Environ. Res. Lab., U.S. Environ. Prot. Agency, College Station Rd., Athens, GA 30613.

² Research Soil Scientist and Chemist, respectively, Environ. Res. Lab., USEPA.

Received for publication June 26, 1980.