Partitioning of chloroaromatic compounds between the aqueous phase and dissolved and particulate soil organic matter at chlorophenol contaminated sites.
The retention and mobility of hydrophobic organic contaminants (HOCs) in soil is mainly determined by hydrophobic partitioning to dissolved and particulate organic matter (DOM and POM, respectively). The aqueous phase, DOM, and POM fractions were extracted and separated from soils at three sites contaminated with technical chlorophenol formulations. Concentrations of chlorophenols (CP), polychlorinated phenoxyphenols (PCPP), polychlorinated diphenyl ethers (PCDE) and polychlorinated dibenzo-p-dioxins and furans (PCDD/F) were determined. The partitioning to POM, in relation to DOM, increased in all three soils with increasing hydrophobicity in the order CP < PCPP ~ PCDE ~ PCDF < PCDD. Differences in partitioning to DOM (logK(DOC)) and POM (logK(POC)) could not be explained by differences in gross organic C chemistry. Black carbon did not contribute significantly to the sorption of PCDDs, whereas >70% wood fibre in one soil resulted in a decrease of logK(POC) of 0.5 units for CPs and PCDDs. We conclude that logK(OC) for both DOM and POM need to be explicitly determined when the retention and mobility of HOCs is described and modelled in soils.
Frankki
Sofia
S
Department of Forest Ecology, Swedish University of Agricultural Sciences, Umeå, Sweden.
Persson
Ylva
Y
Shchukarev
Andrei
A
Tysklind
Mats
M
Skyllberg
Ulf
U
D000327:Adsorption; D005591:Chemical Fractionation; D002733:Chlorophenols / Q000737:chemistry*; D004784:Environmental Monitoring / Q000379:methods; D004787:Environmental Pollution; D006812:Humic Substances; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry*; D052638:Particulate Matter; D012989:Soil Pollutants / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D002733:Chlorophenols; D006812:Humic Substances; D006843:Hydrocarbons, Chlorinated; D052638:Particulate Matter; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical