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Sorption and dialysis experiments to assess the binding of phenolic xenobiotics to dissolved organic matter in soil

: Höllrigl-Rosta, A.; Vinken, R.; Lenz, M.; Schäffer, A.


Environmental toxicology and chemistry 22 (2003), No.4, pp.746-752
ISSN: 0730-7268
Journal Article
Fraunhofer IME ()
phenolic compound; dissolved oranic matter; soil; sorption; dialysis

The binding of two phenolic compounds, nonylphenol (NP) and bisphenol A (BPA), and the herbicide metabolite hydroxydesethyl terbuthylazine (HDT) to dissolved organic matter (DOM) as well as its impact an the environmental fate of the compounds in soil have been investigated. In sorption studies with an acidic silty loam soil and a neutral loam soil, no impact of added DOM an adsorption and desorption coefficients was observed. Adsorption coefficients normalized to soil organic carbon (KOC) of the compounds an the loamy silt soil spanned three orders of magnitude: 90, 890, and 9,140 L/kg for HDT, BPA, and NP, respectively. Significantly lower KOC values for HDT on the neutral loam soil as compared to the acidic loamy silt soil indicated additional polar interactions between the latter and the basic herbicide metabolite. In dialysis experiments with fulvic acid from silty loam soil (FA) and peat humic acid (HA), a formation of analyte-DOM associates was observed only for HA. The degree of association was characterized by distribution coefficients normalized to the dissolved organic carbon concentration (KDOC). Values for NP (8,970 L/kg) and BPA (860 L/kg) corresponded with the respective soil sorption coefficients, suggesting similar binding mechanisms in both cases.