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Reactions of As(V) with Fe(II) under the Anoxic Conditions  

Jung, Woo-Sik (Department of Environmental Engineering, Yonsei University)
Lee, Sang-Hun (Department of Natural Resources and Environmental Engineering, Hanyang University)
Chung, Hyung-Keun (Department of Environmental Engineering, Yonsei University)
Kim, Sun-Joon (Department of Natural Resources and Environmental Engineering, Hanyang University)
Choi, Jae-Young (Korea Institute of Science and Technology (KIST), Gangneung Institute)
Jeon, Byong-Hun (Department of Environmental Engineering, Yonsei University)
Publication Information
Economic and Environmental Geology / v.42, no.5, 2009 , pp. 487-494 More about this Journal
Abstract
The purpose of this study was to investigate the feasibility of As(V) reduction by aqueous Fe(II), and subsequent As(III) immobilization by the precipitation of As(III) incorporated magnetite-like material [i.e., co-precipitation of As(III) with Fe(II) and Fe(III)]. Experimental results showed that homogeneous As(V) reduction did not occur by dissolved Fe(II) at various pH values although the thermodynamic calculation was in favor of the redox reaction between As(V) and Fe(II) under the given chemical conditions. Similarly, no heterogeneous reduction of sorbed As(V) by sorbed Fe(II) was observed using synthetic iron (oxy)hydroxide (Goethite, ${\alpha}$-FeOOH) at pH 7. Experimental results for the effect of As(V) on the oxidation of Fe(II) by dissolved oxygen showed that As(V) inhibited the oxidation of Fe(II). These results indicate that As(V) could be stable in the presence of Fe(II) under the anoxic or subsurface environments.
Keywords
groundwater; arsenic pollution; ferrous iron; arsenate; chemical reduction;
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