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Temporal and spatial trends of PCBs, DDTs, HCHs, and HCB in Swedish marine biota 1969-2012
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
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Number of Authors: 6
2015 (English)In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 44, 484-497 p.Article in journal (Refereed) Published
Abstract [en]

In the 1960s, the Baltic Sea was severely polluted by organic contaminants such as PCBs, HCHs, HCB, and DDTs. Elevated concentrations caused severe adverse effects in Baltic biota. Since then, these substances have been monitored temporally and spatially in Baltic biota, primarily in herring (Clupea harengus) and in guillemot (Uria aalge) egg, but also in cod (Gadus morhua), perch (Perca fluviatilis), eelpout (Zoarces viviparous), and blue mussel (Mytilus edulis). These chemicals were banned in Sweden in the late 1970s/early 1980s. Since the start of monitoring, overall significant decreases of about 70-90 % have been observed. However, concentrations are still higher in the Baltic Sea than in, for example, the North Sea. CB-118 and DDE exceed the suggested target concentrations (24 lg kg(-1) lipid weight and 5 lg kg(-1) wet weight, respectively) at certain sites in some of the monitored species, showing that concentrations may still be too high to protect the most sensitive organisms.

Place, publisher, year, edition, pages
2015. Vol. 44, 484-497 p.
Keyword [en]
Ecotoxicology, Baltic Sea biota, POPs, Monitoring
National Category
Environmental Engineering Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-122518DOI: 10.1007/s13280-015-0673-5ISI: 000362290800015OAI: oai:DiVA.org:su-122518DiVA: diva2:866995
Available from: 2015-11-04 Created: 2015-11-03 Last updated: 2017-12-01Bibliographically approved
In thesis
1. Improved Assessment in Environmental Monitoring of POPs: Using monitoring data from the aquatic ecosystem and human milk
Open this publication in new window or tab >>Improved Assessment in Environmental Monitoring of POPs: Using monitoring data from the aquatic ecosystem and human milk
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The thesis deals with several aspects of monitoring of persistent organic contaminants (POPs) in biological matrices, for example choice of sample, sampling design, and statistical treatment of data both for temporal and spatial trends and for compliance towards a set target value. The efficiency has been evaluated through statistical power analyses. Contaminant data from more than 4 decades from the Swedish National Monitoring Programs for monitoring of contaminants in biota (marine, freshwater and human health), has been quantitatively evaluated both temporally and spatially and for compliance. The aim was also to evaluate the suitability of different matrices, i.e. herring (Clupea harengus), guillemot (Uria aalge) egg, cod (Gadus morhua), perch (Perca fluviatilis), eelpout (Zoarces viviparous), blue mussel (Mytilus edulis), pike (Esox lucius), Arctic char (Salvelinus alpinus) and human milk, for monitoring of POPs with the overall aim to improve the assessment within monitoring programs.

The results show that variation can be reduced by using pooled samples including more specimens but fewer chemical analyses, which in turn generate a higher statistical power to a lower cost, at least in cases where the cost of collection and sampling is considerably lower than the cost of chemical analysis. However, there are also a number of advantages using individual samples, such as information of sample variance and maximum value, which allows the choice of an appropriate central measure and direct adjustment of confounding factors.

Generally, the levels of polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethanes (DDTs), hexachlorocyclohexanes (HCHs) and hexachlorobenzene (HCB) have decreased both in marine and freshwater biota but concentrations are still higher in the Baltic compared to e.g. the North Sea. The levels of dioxinlike-PCBs and polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDD/Fs) have decreased in human milk over time, but not to the same extent in fish and guillemot egg from the Baltic and the freshwater environment. This may be explained by the dietary advice developed by the Swedish Food Administration with the goal that girls, reproductive aged, and pregnant women should eat less food containing high levels of PCDD/Fs. Thus the levels in milk could continue to decrease at the same rate although the temporal trend in the environment has slowed down or leveled out.

The most essential regarding the choice of species and matrices for contaminant monitoring, is that the species and organ fit the purpose of the monitoring.

Place, publisher, year, edition, pages
Stockholm: Department of Environmental Science and Analytical Chemistry, Stockholm University, 2016. 83 p.
Keyword
Environmental monitoring, temporal trends, power analysis, sampling strategy, PCBs, DDTs, HCHs, HCB, PCDD/Fs, fish, bird eggs, blue mussels, human milk
National Category
Other Chemistry Topics
Research subject
Environmental Chemistry
Identifiers
urn:nbn:se:su:diva-134769 (URN)978-91-7649-527-8 (ISBN)978-91-7649-528-5 (ISBN)
Public defence
2016-12-09, William-Olssonsalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 14:00 (English)
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Available from: 2016-11-16 Created: 2016-10-18 Last updated: 2016-11-16Bibliographically approved

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