Effect of Short-Term Resuspension Events on Trace Metal Speciation in Polluted Anoxic Sediments

摘要: The effects of the short-term resuspension a contaminated anoxic estuarine sediment on solid-phase metal speciation have been studied. Preliminary experiments investigated oxidation rates model sulfide phases to provide mechanistic information for interpreting observations natural sediment. FeS and MnS were particularly labile oxidized rapidly in aerated waters. In contrast, CdS, CuS, PbS, ZnS kinetically stable over periods several hours. rate free (HS-) was significantly slower than that MnS. Upon resuspension, rapid decrease acid volatile (AVS) could be accounted by iron monosulfide phases. Over prolonged (>300 min), AVS decreased values lower simultaneously extracted metals [SEM = ∑Cd, Cu, Ni, Pb, Zn (1 M HCl extraction, 30 min)] concentration, indicating significant fraction trace may ox...