engleski

Cadmium and lead distribution in sediment of the Baćina Lakes (Croatia)

The Baćina lakes are small coastal inter-connected lakes in a karst area. The lakes are artificially connected to the hinterland Vrgorac field and the nearby sea in order to drain the field during heavy rains and floods. The storm water has changed the natural conditions in the lakes. In this paper the distribution of cadmium, lead and organic matter in the upper 10-cm sediment layer, as well as granulometric composition were studied. The sediment is a fine grained, with prevailing carbonate particles. Cadmium and lead concentration in the sediment ranges from 0.21 to 1.37 mg/kg (dry weight- d.w.), and from 2.3 to 30.2 mg/kg (d.w.), respectively, which is higher than the concentration of both trace metals in the nearby source rocks. The main origin for cadmium is the Vrgorac field and its nearby rocks, while for lead the main origin is traffic along the nearby roads.

Baćina lakes; cadmium; lead; organic matter; sediment

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