Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Reactions of As(V) with Fe(II) under the Anoxic Conditions

무산소 조건에서의 Fe(II)와 As(V)의 반응에 관한 연구

  • 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)
  • 정우식 (연세대학교 환경공학부) ;
  • 이상훈 (한양대학교 지구환경시스템공학과) ;
  • 정형근 (연세대학교 환경공학부) ;
  • 김선준 (한양대학교 지구환경시스템공학과) ;
  • 최재영 (한국과학기술원 강릉분원) ;
  • 전병훈 (연세대학교 환경공학부)
  • Published : 2009.10.28
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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.

본 연구에서는 무산소 환경에서 As(III)로 대체된 자철석으로의 침전 가능성을 확인하기 위하여 Fe(II)와 As(V)의 반응을 통한 As(V)의 As(III)로의 환원 여부를 조사하였다. Fe(II)와 As(V)가 용액상으로 존재하는 균질조건에서의 환원반응 실험은 pH에 따른 영향을 알아보기 위해 수행되었고, 주어진 pH 조건(3.0~7.3)에서 용해된 Fe(II)에 의한 As(V)의 As(III)로의 환원반응은 일어나지 않았다. 균질조건에서의 환원반응 실험결과와 유사하게 침철석을 이용한 불균질조건에서의 환원반응 실험에서도 침철석에 흡착된 Fe(II)에 의한 As(V)의 환원반응은 일어나지 않았다. 또한 Fe(II)의 산화에 미치는 As(V)의 영향에 대한 회분식 실험결과, As(V)가 Fe(II)의 산화반응을 저해하는 영향을 주었고 균질한 조건에서보다 불균질한 조건에서 As(V)의 영향이 명확하게 나타난 것으로 사료된다. 이런 결과들은 무산소 및 지하 환경에서 Fe(II)와 공존할 때, As(V)는 안정한 상태로 존재함을 시사한다.

Keywords

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