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Partitioning of chloroaromatic compounds between the aqueous phase and dissolved and particulate soil organic matter at chlorophenol contaminated sites
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
2007 (English)In: Environmental Pollution, Vol. 148, no 1, 182-90 p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
Hydrophobic organic contaminants, Soil organic matter, Dissolved organic matter, Particulate organic matter, Partitioning coefficients
URN: urn:nbn:se:umu:diva-13670DOI: doi:10.1016/j.envpol.2006.10.029OAI: diva2:153341
Available from: 2007-05-14 Created: 2007-05-14 Last updated: 2011-01-11Bibliographically approved
In thesis
1. Chlorinated organic pollutants in soil and groundwater at chlorophenol-contaminated sawmill sites
Open this publication in new window or tab >>Chlorinated organic pollutants in soil and groundwater at chlorophenol-contaminated sawmill sites
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Mixtures of chlorinated organic pollutants can be found in the soils at chlorophenol-contaminated sawmill, including (inter alia) polychlorinated phenols (CPs), phenoxyphenols (PCPPs), diphenyl ethers (PCDEs), dibenzofurans (PCDFs) and dioxins (PCDDs). These hydrophobic compounds have low water solubility and hence low mobility as truly dissolved compounds. However, they may migrate through the soil at significant rates via co-transport with dissolved organic matter (DOM) and colloids of fine, waterborne particulate matter. In the work underlying this thesis the distribution of chlorinated hydrophobic pollutants between these two mobile fractions in soil samples from five sawmill sites was studied

Soils at five sites at which CPs were formerly used were characterized, and found to have complex profiles of chlorinated hydrophobic pollutants. CPs, PCPPs, PCDEs and PCDD/Fs were present at up to ppm-levels. Furthermore, the relative proportions of the pollutants differed from their relative proportions in the preservatives used at the sites, indicating that they have been transported from, and/or degraded in, the soil at different rates. These organic pollutants have low water solubility and strong affinity for soil organic matter (SOM). The importance of SOM for the fate of CPs, PCPPs, PCDEs, PCDFs and PCDDs in soil was investigated by examining the distribution of compounds between the mobile DOM and the immobile particulate organic matter (POM). The partitioning of CPs between DOM and POM was found to be approximately equal. However, the relative strength of association with POM of groups of chlorinated organic pollutants was positively correlated with their hydrophobicity, and thus increased in the order CP < PCPP < PCDE < PCDF < PCDD.

Despite the weak association of PCDD/Fs with DOM our investigations found that considerable concentrations of these pollutants were bound to mobile fractions (DOM and colloids, >0.2 µm) in both a groundwater analysis and a leaching test. CPs and PCPP were present at up to ppm- and ppb-levels, respectively, and PCDEs and PCDD/Fs at up to ppt-levels. The importance of transport in association with the mobile fraction (DOM and colloids) increased with increasing hydrophobicity e.g. PCDDs were almost entirely associated with fine particulate matter, while CPs were largely found in the water phase and only minor proportions were associated with colloids.

Place, publisher, year, edition, pages
Umeå: Kemi, 2007. 50 p.
contaminated soil, hydrophobic organic contaminant, chlorinated phenoxyphenol, chlorinated diphenyl ether, chlorinated dibenzofuran, chlorinated dibenzo-p-dioxin, preservation, mobility, colloid, dissolved organic matter, particulate organic matter, groundwater, equilibrium column test, chlorophenol
National Category
Environmental Sciences
urn:nbn:se:umu:diva-989 (URN)978-91-7264-251-5 (ISBN)
Public defence
2007-02-23, KB3B1, KBC-huset, Linnaeus väg 6, Umeå, 10:00 (English)
Available from: 2007-02-01 Created: 2007-02-01 Last updated: 2009-12-03Bibliographically approved

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