Influence of Acid Volatile Sulfides and Metal Concentrations on Metal Partitioning in Contaminated Sediments

摘要: The influence of acid volatile sulfide (AVS) on the partitioning Cd, Ni, and Zn in porewater (PW) sediment as reactive metals (SEM, simultaneously extracted metals) was investigated laboratory microcosms. Two spiking procedures were compared, effects vertical geochemical gradients infaunal activity evaluated. Sediments spiked with a Cd−Ni−Zn mixture (0.06, 3, 7.5 μmol/g, respectively) containing four levels AVS (0.5, 7.5, 15, 35 μmol/g). results compared to sediments mixtures at one concentration (7.5 A redox gradient generated each treatment by an 18-d incubation oxidized water column. [AVS] surface decreased 65−95% due oxidation during incubation; initial maintained 0.5−7.5 cm depth. PW metal concentrations correlated [SEM − AVS] among all data. But variable, causing distribution coefficient, Kdpw (the ratio...