Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Efficiency and Longevity of In-situ Stabilization Methods in Heavy Metal Contaminated Arable Soils

농경지 중금속 안정화 방법의 효율성 및 지속성 평가

  • Kim, Seo Jun (Department of Environmental Engineering, College of Health Science, Yonsei University) ;
  • Oh, Se jin (Yeongheung Division, Korea South-East Power Co.) ;
  • Kim, Sung-Chul (Department of Bio-Environmental Chemistry, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Lee, Sang Soo (Department of Environmental Engineering, College of Health Science, Yonsei University)
  • 김서준 (연세대학교 보건과학대학 환경공학과) ;
  • 오세진 (남동발전 영흥발전본부) ;
  • 김성철 (충남대학교 농업생명과학대학 생물환경화학과) ;
  • 이상수 (연세대학교 보건과학대학 환경공학과)
  • Received : 2018.09.19
  • Accepted : 2018.09.27
  • Published : 2018.09.30
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Abstract

BACKGROUND: Reclamation of heavy metal-contaminated agricultural fields has intensively been done to ensure the soil quality and food security. This study evaluated the efficiency and longevity of current physical and chemical approaches for heavy metal-contaminated soils. METHODS AND RESULTS: Concentrations of 0.1 N HCl-leachable trace metals of Cd, Pb, and As from the stabilizing agents-treated soils decreased by 50%, 70%, and 40%, respectively, compared to the control. Among the stabilizing agents, the $CaCO_3$ was the best for stabilization. For physical stabilization, the soil dressing reduced the concentrations of Cd, Pb, and As by 88%, 94%,and 88%, respectively, compared to the control. Moreover, the dilution of the contaminated soils decreased the metals by an average of 25.3% when compared with the control. The longevity of each stabilization method was determined by using the availability assessment of heavy metals in the soils. Results showed that the leaching methods using HCl and $NH_4NO_3$ had 120 and 32 weeks longevity, respectively. Interestingly, any stabilization efficacy was not found over the time for Cd and Pb (i.e., cation metals), whereas the stabilization efficacy of As was sharply decreased under 50% after 32 weeks. However, the change of metal concentration was not significant with the physical stabilization compared to the chemical stabilization. CONCLUSION: The stabilization methods should carefully be selected based on long-term monitoring under climate conditions.

Keywords

References

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