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>Effects of Dissolved Organic Matter Surrogates on the Partitioning of 17beta-Estradiol and p-Nonylphenol between Synthetic Membrane Vesicles and Water
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Effects of Dissolved Organic Matter Surrogates on the Partitioning of 17beta-Estradiol and p-Nonylphenol between Synthetic Membrane Vesicles and Water
Partition coefficients of two estrogenic compounds,17beta-estradiol (E2) and p-nonylphenol (NP),between synthetic membrane vesicles (K'_(lipw) values) and water were determined using equilibrium dialysis to evaluate the potential biological uptake of these compounds with and without the presence of dissolved natural organic matter (DOM) surrogates,Suwannee River fulvic acid,dialyzed Aldrich humic acid,and polyphenolic tannic acid.Overall,K'_(lipw)values for E2 and NP reduced by 20-30 with the increase of DOM concentration from 0 to approximately 4 mg of C/L,a typical DOM concentration in the aquatic environment.This trend for E2 and NP is similar to that obtained by other researchers for moderately hydrophobic compounds including polycyclic aromatic hydrocarbons with three or four rings.A three-phase compartment model with three independent interactions,the sorption of E2 or NP by DOM surrogate (K_(oc)),the sorption of DOM surrogates by membrane vesicles (K_(LIPDOM)),and the partition of E2 or NP by membrane vesicles (K_lipw)),was proposed,and K'_(lipw) values for E2 or NP in the presence of DOM were calculated.The model predicted the decrease in K'_(lipw) values with the increase of DOM concentration,and the predictions using the three linear interactions agreed satisfactorily with the experimental results at relatively lower concentration of DOM.
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Department of Civil Engineering,The University of Texas at Austin,1 University Station C1786,Austin,Texas 78712-0273,and Research Center for Environmental Quality Control,Kyoto University,1-2 Yumihama,Otsu,Shiga,520-0811 Japan;
