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This article in JEQ

  1. Vol. 30 No. 5, p. 1618-1623
     
    Received: Nov 22, 2000
    Published: Sept, 2001


    * Corresponding author(s): liangxm@mail.dlptt.ln.cn
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doi:10.2134/jeq2001.3051618x

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

  1. Feng Xua,
  2. Xinmiao Liang *a,
  3. Bingcheng Lina,
  4. Fan Sua,
  5. Karl-Werner Schrammb and
  6. Antonius Kettrupb
  1. 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

Abstract

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 k w could be obtained by linearly extrapolating capacity factors in methanol–water eluents (k′) with various volume fractions of methanol (φ). 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 φ ranging from 0 to 0.50. The smaller the φ, the higher the r Therefore, it is recommended that the eluent of smaller φ, 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.

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Copyright © 2001. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyPublished in J. Environ. Qual.30:1618–1623.