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Freely dissolved concentrations and sediment-water activity ratios of PCDD/Fs and PCBs in the open Baltic Sea
Norwegian Geotechnical Institute (NGI), Oslo, Norway. (Department of Applied Environmental Sciences (ITM), Stockholm University, Stockholm, Sweden)
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Department of Applied Environmental Sciences (ITM), Stockholm University, Stockholm, Sweden.
Norwegian Geotechnical Institute (NGI), Oslo, Norway.
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2008 (English)In: Environmental Science & Technology, Vol. 42, no 23, 8733-8739 p.Article in journal (Refereed) Published
Abstract [en]

Aqueous concentrations of polychlorinated dibenzo-p-dioxins and -furans (PCDD/Fs) as well as polychlorinated biphenyls (PCBs) in the open sea have heretofore been measured by filtering and extracting large amounts of water. Measurement of freely dissolved concentrations with this technique is difficult because of corrections for sorption to dissolved organic matter. In this study we use a novel, more economic technique using equilibrium passive samplers consisting of 17-μm thin polyoxymethylene (POM-17), capable of measuring freely dissolved aqueous concentrations (CW) in pristine (i.e., background) locations. POM-17 was employed in an extensive field campaign at five stations in the open Baltic sea to obtain CW at two depths (1 m above the seafloor and 25 m below the surface). Median CW in the overlying water was 2.3 pg toxic equivalents (TEQ)/m3 PCDD/Fs and 15 pg/L sum 7-PCB, with generally less than a factor two variation among sites and depths. Also freely dissolved concentrations of native compounds in the surface sediment porewater (CPW) were determined in laboratory batch experiments. The data were used to derive sediment-water activity ratios, which indicate the diffusive flux direction. It was found that the PCDD/Fs and PCBs were in close equilibrium between the sediment porewater and the overlying water. Comparison of CPW with total sediment concentrations indicated that more than 90% of the compounds were sorbed to sedimentary black carbon.

Place, publisher, year, edition, pages
2008. Vol. 42, no 23, 8733-8739 p.
National Category
Chemical Sciences
URN: urn:nbn:se:umu:diva-10464DOI: 10.1021/es8018379OAI: diva2:150135
Available from: 2008-12-02 Created: 2008-12-02 Last updated: 2013-08-13Bibliographically approved

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Wiberg, KarinPersson, YlvaSundqvist, Kristina
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