Persistent Organic Pollutants in sediment and fish in the River Thames Catchment (UK)

Some organic pollutants including polychlorinated biphenyls (PCBs), polybrominated diphenylethers (PBDEs) and hexachlorobenzene (HCB) have been banned from production and use in the UK for >30years but due to their toxicity and persistence are still of concern. However, due to their hydrophobicit...

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Bibliographic Details
Published in:The Science of the total environment 2017-01, Vol.576, p.78-84
Main Authors: Lu, Qiong, Jürgens, Monika D., Johnson, Andrew C., Graf, Carola, Sweetman, Andy, Crosse, John, Whitehead, Paul
Format: Article
Language:English
Subjects:
Fish
POPs
River Thames
Sediment
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Summary:Some organic pollutants including polychlorinated biphenyls (PCBs), polybrominated diphenylethers (PBDEs) and hexachlorobenzene (HCB) have been banned from production and use in the UK for >30years but due to their toxicity and persistence are still of concern. However, due to their hydrophobicity they are present at very low concentrations and are difficult to measure in water, and so other matrices need to be sampled in order to best assess contamination. This study measured concentrations of ΣICES 7 PCBs (PCB congeners 28, 52, 101, 118, 138, 153 and 180) and Σ6 PBDEs (PBDE congeners 28, 47, 99, 100, 153, 154) and HCB in both bed-sediments and wild roach (a common pelagic fish) in the Thames Basin. The highest sediment concentrations were detected in an urbanised tributary of the Thames, The Cut at Bracknell (HCB: 0.03–0.40μg/kg dw; ICES 7 PCBs: 4.83–7.42μg/kg dw; 6 BDEs: 5.82–23.10μg/kg dw). When concentrations were expressed on a dry weight basis, the fish were much more contaminated than the sediments, but when sediment concentrations were normalised to organic carbon concentration they were comparable to the fish lipid normalised concentrations. Thus, despite the variability in the system, both sediments and wild fish can be considered suitable for representing the level of POPs contamination of the river system given sufficient sample numbers. [Display omitted] •The mean PBDEs concentrations in fish exceeded the proposed European standards.•The highest sediment POPs values were found in an urbanised tributary of the Thames.•A higher dw concentration of POPs was found in the fish compared to the sediment.•When normalised to OC/lipid, a similar POPs level in sediment and fish can be seen.•The data suggests the contaminations of sediment and fish by POPs are connected.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2016.10.067