Reductive dissolution and metal transport in lake coeur d alenesediments

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The benthic sediments in Lake Coeur d Alene, northern Idaho,have been contaminated by metals (primarily Zn, Pb, and Cu) from decadesof upstream mining activities. As part of ongoing research on thebiogeo-chemical cycling of metals in this area, a diffusivereactive-transport model has been developed to simulate metal transportin the lake sediments. The model includes 1-D inorganic diffusivetransport coupled to a biotic reaction network with multiple terminalelectron acceptors under redox disequilibrium conditions. Here, the modelis applied to evaluate the competing effects of heavy-metal mobilizationthrough biotic reductive dissolution of Fe(III) (hydr)oxides, andimmobilization as biogenic sulfide minerals. Results indicate that therelative rates of Fe ... continued below

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Sengor, Sevinc.S.; Spycher, Nicolas.F.; Ginn, Timothy.R.; Moberly, James; Peyton, B. & Sani, Rajesh.K. April 27, 2007.

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Description

The benthic sediments in Lake Coeur d Alene, northern Idaho,have been contaminated by metals (primarily Zn, Pb, and Cu) from decadesof upstream mining activities. As part of ongoing research on thebiogeo-chemical cycling of metals in this area, a diffusivereactive-transport model has been developed to simulate metal transportin the lake sediments. The model includes 1-D inorganic diffusivetransport coupled to a biotic reaction network with multiple terminalelectron acceptors under redox disequilibrium conditions. Here, the modelis applied to evaluate the competing effects of heavy-metal mobilizationthrough biotic reductive dissolution of Fe(III) (hydr)oxides, andimmobilization as biogenic sulfide minerals. Results indicate that therelative rates of Fe and sulfate reduction could play an important rolein metal transport through the envi-ronment, and that the formation of(bi)sulfide complexes could significantly enhance metal solubility, aswell as desorption from Fe hydroxides.

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  • Water Rock Interaction 12, Kunming, China, July31 - August 5, 2007

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  • Report No.: LBNL--63045
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 918674
  • Archival Resource Key: ark:/67531/metadc886537

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  • April 27, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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Sengor, Sevinc.S.; Spycher, Nicolas.F.; Ginn, Timothy.R.; Moberly, James; Peyton, B. & Sani, Rajesh.K. Reductive dissolution and metal transport in lake coeur d alenesediments, article, April 27, 2007; (digital.library.unt.edu/ark:/67531/metadc886537/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.