engleski

DISTRIBUTION OF MERCURY, CADMIUM, LEAD, COPPER AND ZINC IN SEDIMENTS OF OF THE RIJEKA HARBOUR AS RECORD OF POLLUTION

Distribution of ecotoxic trace metals cadmium, lead, copper, zinc and mercury was investigated in sediment samples (first 9 centimetres) from 3 locations in area of the Rijeka Harbour. In the first and second location a vertical distribution of trace metal concentrations in investigated sediments is uniform. In a third one vertical distribution reveals increase of metal concentration from the surface down to the sediment column (Hg 1.73-5.65 µ g/g ; Cd 1.28-8.54 µ g/g ; Pb 383-1206 µ g/g ; Cu 232-1156 µ g/g and Zn 562-2225 µ g/g), indicating reduction of pollution in the last decade. Concentrations of cadmium, copper, lead and zinc were determined by differential pulse anodic stripping voltammetry (DPASV), while mercury by the cold vapor atomic absorption spectrometry (CVAAS). As National Regulation on the sediment chemical quality criterion does not exist, measured metal concentrations in sediments were compared with ones in some Croatian (Šibenik) and world’ s harbours (Apra, Kaohsiung, Napoli, Sydney) as well as with ones sampled in the region of the North Adriatic Sea. Results comparison shows that concentrations of ecotoxic metals in sediments of Rijeka Harbour are comparable with results in others harbours but significantly above natural values of North Adriatic Sea.

sediment; Rijeka Harbor; mercury; cadmium; lead; copper; zinc

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