Journal of Soil and Groundwater Environment (한국지하수토양환경학회지:지하수토양환경)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
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Oxalic Acid-based Remediation of Arsenic-contaminated Soil

옥살산 기반의 비소오염토양 정화 연구

  • Lee, Myeong Eun (Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University) ;
  • Jeon, Eun-Ki (Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University) ;
  • Kim, Jong-Gook (Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University) ;
  • Baek, Kitae (Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University)
  • 이명은 (전북대학교 환경공학과 및 전북대학교 토양환경연구센터) ;
  • 전은기 (전북대학교 환경공학과 및 전북대학교 토양환경연구센터) ;
  • 김종국 (전북대학교 환경공학과 및 전북대학교 토양환경연구센터) ;
  • 백기태 (전북대학교 환경공학과 및 전북대학교 토양환경연구센터)
  • Received : 2018.01.10
  • Accepted : 2018.02.20
  • Published : 2018.03.31
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Abstract

Arsenic (As) usually is bound to amorphous iron oxides in the soils, and it can be removed via dissolution of iron oxides. Inorganic acid and chelating agent are widely used to extract As in the soil washing. However, the overall performance is highly dependent on the state of As fractionation. In this study, oxalic acid and inorganic acids (HCl, $H_2SO_4$, and $H_3PO_4$) were applied to enhance the dissolution of iron oxides for remediation of As-contaminated soils. Oxalic acid was most effective to extract As from soils and removal of As was two times greater than other inorganic acids. Additionally, 75% of As bound to amorphous iron oxides was removed by 0.2 M oxalic acid. Arsenic removal by oxalic acid was directly proportional to the sum of labile fractions of As instead of the total concentration of As. Therefore, the oxalic acid could extract most As bound to amorphous iron oxides.

Keywords

References

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