Partitioning of chloroaromatic compounds between the aqueous phase and dissolved and particulate soil organic matter at chlorophenol contaminated sites
2007 (English)In: Environmental Pollution, Vol. 148, no 1, 182-90 p.Article in journal (Refereed) Published
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 (log KDOC) and POM (log KPOC) 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 log KPOC of 0.5 units for CPs and PCDDs. We conclude that log KOC for both DOM and POM need to be explicitly determined when the retention and mobility of HOCs is described and modelled in soils.
Increasing hydrophobicity of organic compounds increases the partitioning to particulate natural organic matter relative to dissolved natural organic matter.
Place, publisher, year, edition, pages
2007. Vol. 148, no 1, 182-90 p.
Hydrophobic organic contaminants, Soil organic matter, Dissolved organic matter, Particulate organic matter, Partitioning coefficients
IdentifiersURN: urn:nbn:se:umu:diva-13670DOI: doi:10.1016/j.envpol.2006.10.029OAI: oai:DiVA.org:umu-13670DiVA: diva2:153341