PuSH - Publication Server of Helmholtz Zentrum München: Soil column chromatography for correlation between capacity factors and soil organic partition coefficients for eight pesticides.

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Xu, F.* ; Liang, X.* ; Lin, B.* ; Su, F.* ; Schramm, K.-W. ; Kettrup, A.

Soil column chromatography for correlation between capacity factors and soil organic partition coefficients for eight pesticides.

Chemosphere 39, 2239-2248 (1999)

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Open Access Gold as soon as Publ. Version/Full Text is submitted to ZB.

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A soil column chromatographic method was developed to measure the capacity factors (k′) of pesticides, in which soil acted as a stationary phase and methanol-water mixture as an eluent. The k′ values of eight pesticides, including three insecticides (methiocarb, azinphos-methyl, fenthion), four fungicides (triadimenol, fuberidazole, tebuconazole, pencycuron), and one herbicide (atrazine), were found to be well fitted to a retention equation, ln k′ = ln k′_w-Sθ. Due to similar interactions of solutes with soil and solvent in both sorption determination and retention experiment, log k′ has a good linear correlation with log K_oc for the eight pesticides from different classes, in contrast with poor correlation between log k′ from C₁₈ column and log K_oc. So the method provides a tool for rapid estimation K_oc from experimental k′.

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