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Sensitive equilibrium sampling to study polychlorinated biphenyl disposition in Baltic Sea sediment
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
2012 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 46, no 18, 10114-10122 p.Article in journal (Refereed) Published
Abstract [en]

An equilibrium sampling approach using glass jars with pm thin coatings of the silicone polydimethylsiloxane (PDMS) was validated and applied to background sediment samples from a >50 km transect in the Stockholm Archipelago. Equilibrium between the sediment and the PDMS was demonstrated using different coating thicknesses. From the concentrations of polychlorinated biphenyls (PCBs) in the PDMS, we assessed (i) freely dissolved concentrations in the sediment interstitial porewater (C-Sediment_free); (ii) the equilibrium brium status between sediment and water; (iii) the equilibrium status between sediment and biota; and (iv) site-specific sediment/water distribution ratios (K-D). The results showed that (i) Stockholm was a source of PCBs to the Baltic Sea as evidenced by significantly higher C-Sediment_free in Stockholm Harbor; (ii) the fugacity in sediment exceeded that in water (monitoring samples collected in February) by an average factor of 4.0; (iii) the fugacity in sediment exceeded that in herring by an average factor of 5.2; and (iv) K-D near Stockholm Harbor was 0.3-1.7 log units greater than in the outer archipelago. The coated glass jar method with its high precision and built-in QA/QC opens new possibilities to study the disposition of hydrophobic chemicals at trace levels (C-Sediment_free down to 1.06 fg/L) in background environments.

Place, publisher, year, edition, pages
2012. Vol. 46, no 18, 10114-10122 p.
National Category
Environmental Sciences
Research subject
Environmental Chemistry
Identifiers
URN: urn:nbn:se:su:diva-81843DOI: 10.1021/es302330vISI: 000308787800037OAI: oai:DiVA.org:su-81843DiVA: diva2:564100
Funder
Formas, 216-2005-1200
Note

AuthorCount:3;

Available from: 2012-11-01 Created: 2012-11-01 Last updated: 2017-12-07Bibliographically approved

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Jahnke, AnnikaMcLachlan, Michael S.
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