Reductive dissolution and metal transport in Lake Coeur dAlene sediments
The benthic sediments in Lake Coeur dAlene, northern Idaho, have been contaminated by metals (primarily Zn, Pb, and Cu) from decades of upstream mining activities. As part of ongoing research on the biogeochemical cycling of metals in this area, a diffusive reactive-transport model has been developed to simulate metal transport in the lake sediments. The model includes 1-D inorganic diffusive transport coupled to a biotic reaction network with multiple terminal electron acceptors under redox disequilibrium conditions.Here, the model is applied to evaluate the competing effects of heavy-metal mobilization through biotic reductive dissolution of Fe(Ⅲ) (hydr)oxides, and immobilization as biogenic sulfide minerals. Results indicate that the relative rates of Fe and sulfate reduction could play an important role in metal transport through the environment,and that the formation of(bi)sulfide complexes could significantly enhance metal solubility, as well as desorption from Fe hydroxides.
S.S.Sengor N.F.Spycher T.R.Ginn J.Moberly B.Peyton R.K.Sani
University of California, Civil and Environmental Engineering Department, Davis, CA, USA Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA Montana State University, Chemical and Biological Engineering Department, Bozeman, MT, USA South Dakota School of Mines and Technology, Chemical and Biological Engineering Department, Rapid C
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
895-899
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）