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TECHNICAL REPORT
Organic Compounds in the Environment

Prediction of Soil Organic Partition Coefficients by a Soil Leaching Column Chromatographic Method

^a Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 161 Zhongshan Road, Dalian 116011, P.R. China
^b GSF-National Research Center for Environment and Health, Institute of Ecological Chemistry, Ingolstädter Landstrasse 1, D-85764 Neuherberg, Germany

* Corresponding author (liangxm{at}mail.dlptt.ln.cn)

Received for publication November 22, 2000. The soil organic partition coefficient (K_oc) is one of the most important parameters to depict the transfer and fate of a chemical in the soil–water system. Predicting K_oc by using a chromatographic technique has been developing into a convenient and low-cost method. In this paper, a soil leaching column chromatograpy (SLCC) method employing the soil column packed with reference soil GSE 17201 (obtained from Bayer Landwirtschaftszentrum, Monheim, Germany) and methanol–water eluents was developed to predict the K_oc of hydrophobic organic chemicals (HOCs), over a log K_oc range of 4.8 orders of magnitude, from their capacity factors. The capacity factor with water as an eluent could be obtained by linearly extrapolating capacity factors in methanol–water eluents (k') with various volume fractions of methanol (). The important effects of solute activity coefficients in water on k^'_w and K_oc were illustrated. Hence, the correlation between log K_oc and log k^'_w (and log k') exists in the soil. The correlation coefficient (r) of the log K_oc vs. log k^'_w correlation for 58 apolar and polar compounds could reach 0.987, while the correlation coefficients of the log K_oc–log k' correlations were no less than 0.968, with ranging from 0 to 0.50. The smaller the , the higher the r. Therefore, it is recommended that the eluent of smaller , such as water, be used for accurately estimating K_oc. Correspondingly, the r value of the log K_oc–log k^'_w correlation on a reversed-phase Hypersil ODS (Thermo Hypersil, Kleinostheim, Germany) column was less than 0.940 for the same solutes. The SLCC method could provide a more reliable route to predict K_oc indirectly from a correlation with k^'_w than the reversed-phase liquid chromatographic (RPLC) one.

Abbreviations: HOC, hydrophobic organic chemical • RPLC, reversed-phase liquid chromatography • SLCC, soil leaching column chromatography

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