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The concentration of 9 polychlorinated biphenyls (PCB 28, 52, 101, 151, 153, 170, 180, 183 and 194) and of 8 micropollutants commonly classified as organochlorinated pesticides, or OCPs (alpha-HCH, beta-HCH, gamma-HCH, QCB, HCB, pp'-DDT, pp'-DDE and pp'-DDD), was determined in 22 sediment samples of lake Simbirizzi, an artificial reservoir supplying drinking water to the city of Cagliari (Sardinia, Italy). The quantification was performed by analysing purified sediment extracts through high resolution capillary column gas chromatography - electron capture detection (HRGC-ECD). The average concentrations proved to be relatively low. In the case of pp'-DDE, the contaminant with the highest concentration, a mean value of 0.84 parts per billion (ppb) (µg/kg dry matter) was found. These relatively low concentrations and the comparison with data relating to other lakes suggest that, as far as PCBs and the majority of OCPs are considered, atmospheric inputs are likely to be the main source of contamination. Only for lindane (gamma-HCH) and its isomers (alpha-HCH and beta-HCH) is it possible to assume a contribution from agricultural activities.

Additional information

Authors: KALAJZIC T, JRC Ispra (IT);MUNTAU H, JRC Ispra (IT);BIANCHI M, Ecoconsult, Gavirate (IT);KETTRUP A, Technische Universität München, Institut für Chemie, Freising Weihenstephan (DE)
Bibliographic Reference: Article: Chemosphere
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