Change search
ReferencesLink to record
Permanent link

Direct link
Validating Possible Effects of Eutrophication Using PCB Concentrations in Bivalves and Sediment of the US Musselwatch and Benthic Surveillance Programs.
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
2000 (English)In: Ambio, ISSN 0044-7447, Vol. 29, no 4-5, 246-251 p.Article in journal (Refereed) Published
Abstract [en]

In order to examine the possible interactions of eutrophication and hydrophobic organic contaminants, data for polychlorinated biphenyl (PCB) concentrations (C-PCB) in three species of bivalves and in sediments were examined. These were correlated to total organic carbon content of sediments (TOCsed), which was assumed to represent the trophic status of the sampling sites. Almost all C-PCB on dry weight basis in the bivalves and in the sediments were positively linearly correlated to TOCsed. Regarding the sediments, this simply reflects the high affinity of these compounds for TOC, but for the bivalves the correlation was not explained. In the bivalves, the difference in PCB homologue concentration was positively linearly correlated to TOCsed. To understand these field data, a box model was used to simulate the fate of PCB in oligotrophic, mesotrophic, eutrophic, and hypertrophic marine environments. The calculated results qualitatively predicted the change in C-PCB for the sediment correctly. For increased trophic status of the water compartment, on a scale from oligo- to hypertrophic, the model predicted decreasing fugacities for the PCBs, and thus could not support the observations of increased bivalve C-PCB seen in the field data study. It was suggested that the PCB pattern change in the bivalves could be influenced by algae-growth dynamics in the watercolumn. This would selectively intensify the washout of the lighter chlorinated homologues from the water and, thereby, decrease their concentrations in the bivalves.

Place, publisher, year, edition, pages
2000. Vol. 29, no 4-5, 246-251 p.
Keyword [en]
URN: urn:nbn:se:su:diva-22769OAI: diva2:189413
Part of urn:nbn:se:su:diva-11Available from: 2003-09-23 Created: 2003-09-23 Last updated: 2009-10-07Bibliographically approved
In thesis
1. Models of the Distribution of Persistent Organic Pollutants in the Marine Environment
Open this publication in new window or tab >>Models of the Distribution of Persistent Organic Pollutants in the Marine Environment
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Persistent organic pollutants (POPs) is a group of chemicals that are toxic, undergo long-range transport and accumulate in biota. Due to their persistency the distribution and recirculation in the environment often continues for a long period of time. Thereby they appear virtually everywhere within the biosphere, and poses a toxic stress to living organisms. In this thesis, attempts are made to contribute to the understanding of factors that influence the distribution of POPs with focus on processes in the marine environment. The bioavailability and the spatial distribution are central topics for the environmental risk management of POPs. In order to study these topics, various field studies were undertaken. To determine the bioavailable fraction of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), polychlorinated naphthalenes (PCNs), and polychlorinated biphenyls (PCBs) the aqueous dissolved phase were sampled and analysed. In the same samples, we also measured how much of these POPs were associated with suspended particles. Different models, which predicted the phase distribution of these POPs, were then evaluated. It was found that important water characteristics, which influenced the solid-water phase distribution of POPs, were particulate organic matter (POM), particulate soot (PSC), and dissolved organic matter (DOM). The bioavailable dissolved POP-phase in the water was lower when these sorbing phases were present. Furthermore, sediments were sampled and the spatial distribution of the POPs was examined. The results showed that the concentration of PCDD/Fs, and PCNs were better described using PSC- than using POM-content of the sediment. In parallel with these field studies, we synthesized knowledge of the processes affecting the distribution of POPs in a multimedia mass balance model. This model predicted concentrations of PCDD/Fs throughout our study area, the Grenlandsfjords in Norway, within factors of ten. This makes the model capable to validate the effect of suitable remedial actions in order to decrease the exposure of these POPs to biota in the Grenlandsfjords which was the aim of the project. Also, to evaluate the influence of eutrophication on the marine occurrence PCB data from the US Musselwatch and Benthic Surveillance Programs are examined in this thesis. The dry weight based concentrations of PCB in bivalves were found to correlate positively to the organic matter content of nearby sediments, and organic matter based concentrations of PCB in sediments were negatively correlated to the organic matter content of the sediment.

Place, publisher, year, edition, pages
Stockholm: Institutionen för systemekologi, 2003. 42 p.
persistent organic pollutants, mass balance models, fugacity models, eutrophication, PCDD/F, PCB, PCN, soot carbon.
National Category
Environmental Sciences
urn:nbn:se:su:diva-11 (URN)91-7265-665-4 (ISBN)
Public defence
2003-06-05, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 8 A, Stockholm, 13:00
Available from: 2003-09-23 Created: 2003-09-23Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Broman, D
By organisation
Department of Applied Environmental Science (ITM)
In the same journal

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 121 hits
ReferencesLink to record
Permanent link

Direct link