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The content of metals in carbonates, sulfides, exchangeable, adsorbed and organically bound forms was determined in bottom sediment by means of a sequential chemical extraction method after Rudd et al. Cadmium, nickel and copper was found mainly in the forms of sulfides (Cd > 40%, Ni > 30%, Cu > 70%), chromium and zinc in the fraction of carbonates and sulfides. Manganese was attributed to...
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