engleski

Background of Some Heavy Metals on the Croatian Carst

The aim of the research is to prove the influence of air pollution with heavy metals on the Carst area of Croatia. The following heavy metals were monitored: lead (Pb) copper (Cu), zinc (Zn) and cadmium (Cd). At 55 localities in the Croatian carst the organic layer (0-3 cm) and mineral soil of cambisols (5-25 cm) were collected and analyzed. On average 1 kg of soil was collected from each locality for analysis. On the mountain Velebit 4 samples from deep pit-cave were also collected (Lukina jama-Trojama pit) as a reference point. During sampling maximum caution is required in order to avoid errors when taking 'natural' and pure sediment samples in "Lukina jama" pit. Research was undertaken in the carst forest ecosystem area in the Mediterranean region of Croatia. From the results obtained, it can be concluded that there is a higher level of lead, and especially cadmium, in the upper layers of the soil (0-3 cm), while in the mineral layer (5-25 cm) this level is somewhat lower. The amount of cadmium is close to the boundary value of 2, 0 mg/kg. The mean value for lead in the upper layer is 43, 1 mg Pb/kg while for the mineral area of the soil it is 29, 8 mg Pb/kg, for cadmium the mean value in the upper layer is 1, 7 mg Cd/kg while for the mineral layer it is 1, 8 mg Cd/kg. The mean values for copper are 9, 9 mg Cu/kg for the upper layer and 10, 1 mg Cu/kg for the mineral layer of the soil ; while for zinc they are 19, 0 mg Zn/kg for the upper layer and 7, 6 mg Zn/kg for the mineral area of the soil. Copper and zinc can be found in low concentrations in the carst area of the Mediterranean region of Croatia. Samples from deep pit Lukina jama-Trojama (-1343m) have low concentration of heavy metals compare with the soil on the carst area.

Heavy metals; Croatian carst; cambisol; "Lukina jama-Trojama" pit

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