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Freely Dissolved Concentrations and Sediment-Water Activity Ratios of PCDD/Fs and PCBs in the Open Baltic Sea
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- Cornelissen, Gerard (author)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM),Norwegian Geotechnical Institute (NGI), Oslo, Norway,Department of Applied Environmental Sciences (ITM), Stockholm University, Stockholm, Sweden
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- Wiberg, Karin (author)
- Umeå universitet,Kemiska institutionen
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- Broman, Dag (author)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM),Department of Applied Environmental Sciences (ITM), Stockholm University, Stockholm, Sweden
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- (creator_code:org_t)
- 2008-10-25
- 2008
- English.
- In: Environmental Science and Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 42:23, s. 8733-8739
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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-mu m thin polyoxymethylene (POM-17), capable of measuring freely dissolved aqueous concentrations (C-W) 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 C-W at two depths (1 m above the seafloor and 25 m below the surface). Median C-W in the overlying water was 2.3 pg toxic equivalents (TEQ)/m(3) 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 (C-PW) 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 C-PW with total sediment concentrations indicated that more than 90% of the compounds were sorbed to sedimentary black carbon.
Subject headings
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- dibenzo-p-dioxins
- organic contaminants
- passive samplers
- harbor sediments
- black carbon
- sorption
- soot
- bioavailability
- temperature
- desorption
- Biology
- Biologi
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Jonsson, Per
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