Author(s)

T. Zvonaric & N. Odzak

Abstract

Determination of Hg, Cu, Zn and Cd mass fractions in surface sediment where the state of pollution, both past and present, of an ecosystem are recorded, started in 1983 at six main stations in the study area. Recently Pb, As, Mn and Sb have been included in analysis. The results of analysis and statistical calculations for 1983-1995 show that the highest mass fractions of almost all studied heavy metals are found in the naturally enclosed areas with marginal biodegradation abilities (KaStela, Sibenik, Gruz Bays). Even though these bays are still receiving uncontrolled quantities of different pollutants, it is still encouraging that the concentrations of some elements (As, Mn, and Sb) showed a slightly decreasing tendency during the te

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