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1H a/b/c - Pesticides, pharmaceuticals, perfluoroalkylated substances, antibiotics (WEP/18) Perfluorooctane sulfonate concentrations in Swedish urban and background fish samples. Jarnberg, Ulf1, Holmstrom, Katrin1, 1 Institute of Applied Environmental Research, Stockholm, Sweden ABSTRACT- Results from a Swedish national two-year survey of perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) in 180 urban and background fish samples, mainly perch (Perca fluviatilis) are presented. The survey also includes a comparative study of the distribution of PFOS in different tissues of perch. Background concentrations of PFOS in perch muscle from sites without local pollution were 1-2ng/g on a fresh weight basis. Slightly elevated concentrations (3-8 ng/g) were found in perch from urban sites in the vicinity of municipal sewage treatment plants. Clearly elevated concentrations (20-44 ng/g) were found in perch muscle from all locations in the Lake Malaren in the Stockholm waterways upstream as well as downstream the city of Stockholm, and also downstream of one small municipal in the southern part of Sweden. PFOS concentrations showed a gradual decrease down to close to background values throughout the Stockholm archipelago. The average liver-to-muscle concentration ratio was 3 (n=10) Relative standard deviation of PFOS concentration was studied in perch muscle and was found to be 33 percent (n=10). The concentrations found in this study fall within the lower third of the range of previously reported values in fish muscle samples from the Great Lakes (6-190 ng/g). PFOA could not be found at detectable concentrations (detection limit 0.5ng/g) in any of the samples investigated. Key words: fish, PFOS, muscle, liver |
