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Air–sea gas exchange of HCHs and PCBs and enantiomers of α-HCH in the Kattegat Sea region
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
2004 (English)In: Environmental Pollution: Volume 128, Issues 1-2, March 2004, Pages 73-83, ISSN 0269-7491, Vol. 128, no 1-2, 73-83 p.Article in journal (Refereed) Published
Abstract [en]

Concentrations and air–water gas exchange of polychlorinated biphenyls (PCBs) and hexachlorocyclohexanes (HCHs) were determined in nine paired air and water samples. The samples were collected monthly in the Kattegat Sea between December 1998 and November 1999. Average fugacity and flux values indicated that PCBs were oversaturated in the water, while HCHs were net deposited. Variations were large over the year, especially during spring and summer. Air parcel back trajectories suggested that air concentrations over the Kattegat Sea are largely dependent of air mass origin. Seasonal trends were detected for airborne HCHs and for PCBs in water. The air and water enantiomeric compositions of α-HCH indicated that a larger portion of α-HCH in air originated from the underlying water during summer than during winter.

Air–water exchange of PCBs and HCHs is studied in the Kattegat Sea and shows to vary seasonally.

Place, publisher, year, edition, pages
2004. Vol. 128, no 1-2, 73-83 p.
Keyword [en]
HCHs, PCBs, Gas exchange, Kattegat Sea, Enantiomer fraction
URN: urn:nbn:se:umu:diva-14198DOI: doi:10.1016/j.envpol.2003.08.022OAI: diva2:153869
Available from: 2007-05-24 Created: 2007-05-24 Last updated: 2011-01-12Bibliographically approved
In thesis
1. Sources of dioxins and other POPs to the marine environment: Identification and apportionment using pattern analysis and receptor modeling
Open this publication in new window or tab >>Sources of dioxins and other POPs to the marine environment: Identification and apportionment using pattern analysis and receptor modeling
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the studies underlying this thesis, various source tracing techniques were applied to environmental samples from the Baltic region.

Comprehensive sampling and analysis of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in surface sediments in Swedish coastal and offshore areas resulted in a unique data set for this region. Nearly 150 samples of surface sediments were analyzed for all tetra- to octa-chlorinated PCDD/Fs. The levels showed large spatial variability with hotspots in several coastal regions. Neither Sweden nor the EU has introduced guideline values for PCDD/Fs in sediment, but comparisons to available guidelines and quality standards from other countries indicate that large areas of primarily coastal sediments may constitute a risk to marine organisms.

Multivariate pattern analysis techniques and receptor models, such as Principal Component Analysis (PCA) and Positive Matrix Factorization (PMF), were used to trace sources. These analyses suggested that three to six source types can explain most of the observed pattern variations found in the sediment samples. Atmospheric deposition was suggested as the most important source to offshore areas, thus confirming earlier estimates. However, spatial differences indicated a larger fraction of local/regional atmospheric sources, characterized by PCDFs, in the south. This was indicated by the identification of several patterns of atmospheric origin. In coastal areas, the influence of direct emission sources was larger, and among these, chlorophenol used for wood preservation and emissions from pulp/paper production and other wood related industry appeared to be most important. The historic emissions connected to processes involving chemical reactions with chlorine (e.g. pulp bleaching) were found to be of less importance except at some coastal sites.

The analysis of PCDD/Fs in Baltic herring also revealed spatial variations in the levels and pollution patterns along the coast. The geographical match against areas with elevated sediment levels indicated that transfer from sediments via water to organisms was one possible explanation.

Fugacity, a concept used to predict the net transport direction between environmental matrices, was used to explore the gas exchange of hexachlorocyclohexanes (HCHs) and polychlorinated biphenyls (PCBs) between air and water. These estimates suggested that, in the Kattegat Sea, the gaseous exchange of HCHs primarily resulted in net deposition while PCBs were net volatilized under certain environmental conditions. The study also indicated that, while the air concentrations of both PCBs and γ-HCH are mostly dependent upon the origin of the air mass, the fluctuations in α-HCH were primarily influenced by seasonal changes.


Place, publisher, year, edition, pages
Umeå: Umeå University, 2009. 69 p.
air-water gas exchange, chiral, congener pattern, enantiomer, enantiomeric fraction, fugacity, HCH, hexachlorocyclohexane, homologue profile, indicator congener, isomer pattern, pattern analysis, PCA, PCB, PCDD/F, PMF, polychlorinated dibenzofuran, polychlorinated dibenzo-p-dioxin, polychlorinated biphenyl, positive matrix factorization, principal component analysis, receptor modeling, source apportioning, source, source tracing
National Category
Environmental Sciences Environmental Sciences
urn:nbn:se:umu:diva-22266 (URN)978-91-7264-792-3 (ISBN)
Public defence
2009-05-29, KB3B1, KBC-huset, Umeå Universitet, Umeå, 13:00 (English)
Available from: 2009-05-08 Created: 2009-05-04 Last updated: 2009-05-08Bibliographically approved

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