engleski

Distribution of organochlorine compounds in mussels collected at breeding farms along the Croatian Adriatic coast

Polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) belong to the group of Persistent Organic Pollutants. Mussels are good geographical bioindicators of pollution due to their ability to filter seawater and accumulate contaminants. The aim of this study was to investigate the distribution of 17 PCB congeners and 7 OCPs in the edible tissue ofthe aquacultured Mytilus galloprovincialis and natural population Venus verrucosa collected along the Croatian Adriatic. Mussels were collected in January and July 2010 and prepared as lyophilisate. Lyophilisate was cold extracted with n-hexane and cleaned up with sulphuric acid. The analysis was done on two high resolution gas chromatographs with electron capture detectors (HRGC/ECO) on two capillary columns. Seventeen PCB congeners were analysed:PCB- 28, PCB-52, PCB-101, PCB-138, PCB-153, PCB-180, PCB-105, PCB-1l4, PCB-1l8, PCB-123, PCB-156, PCB-157, PCB-167, PCB-170, PCB-189, PCB-60, and PCB-74 (numbered according to IUPAC), as well as the following OCPs: hexachlorobenzene (HCB), a-HCH, p-HCH, y-HCH (a-, p-, y-hexachlorocyclohexanes), 1, I- dichloro-2, 2-di(4- chlorophenyl)ethylene (ODE), 1, 1-dichloro-2, 2- di( 4-chlorophenyl)ethane (DDO) and 1, 1, 1- trichloro-2, 2-di( 4- chlorophenyl)ethane (DOT). All analysed OCPs found in all samples, were in the range between 0.08 ng g-I d. w. for u-HCH and 8.76 ng g' d. w. for DOT. The concentration range of six indicator PĆBs was between 0.09 ng g-I for PCB- 101 and 37.68 ng g-I d. w. for PCB-138. The remain ing 11 PCBs ranged between below determination limit (PCB-157 was not found at 2 sampling sites in January 2010) and 19.03 ng s:' d. w. for PCB-123.

Adriatic sea; biomonitoring; Mytilus galloprovincialis; organochlorine pesticides; persistent organic pollutants; polychlorinated biphenyls; Venus verrucosa

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