• Risk Mitigation Measures in Arsenic-contaminated Soil at the Forest Area Near the Former Janghang Smelter Site: Applicability of Stabilization Technique and Follow-up Management Plan
  • An, Jinsung;Yang, Kyung;Kang, Woojae;Lee, Jung Sun;Nam, Kyoungphile;
  • Dept. of Civil & Environmental Engineering, Seoul National University;Environmental Assessment Group, Korea Environment Institute;JM Enviro Partners Co., Ltd.;Korea Environment Corporation;Dept. of Civil & Environmental Engineering, Seoul National University;
  • (구)장항제련소 주변 송림숲 등 식생지역에서의 비소오염토양 위해도 저감 조치: 안정화 공법 적용성 평가 및 사후관리 계획
  • 안진성;양경;강우재;이정선;남경필;
  • 서울대학교 건설환경공학부;한국환경정책평가연구원 환경평가본부;(주)JM Enviro Partners;한국환경공단;서울대학교 건설환경공학부;
Abstract
This study was conducted to investigate the performance of four commercial chemical agents in stabilizing arsenic (As) in soil at the forest area near the former Janghang smelter site. After amending the stabilizing agents (A, B, C, and D) into As-contaminated soil samples, synthetic precipitation leaching procedure (SPLP) and solubility bioavailability research consortium (SBRC)-extractable As concentrations significantly decreased except for agent D, which is mainly composed of fly ash and calcium carbonate. Increase of SPLP and SBRC-extractable As concentrations in four soil samples (S1, S2, S3, and J2) was attributed to desorption of As adsorbed on iron oxides due to high pH generated by agent D. It is therefore necessary to consider application conditions according to soil characteristics such as pH and buffering capacity. Results of sequential extraction showed that readily extractable fractions of As in soil (i.e., sum of $SO_4-$ and $PO_4-extractable$ As in soil) were converted into non-readily extractable fractions by amending agents A, B, and C. Such changes in the As distribution in soil resulted in the decrease of SPLP and SBRC-extractable As concentration. A series of follow-up monitoring and management plan has been suggested to assess the longevity of the stabilization treatments in the site.

Keywords: Former Janghang smelter;Arsenic;Soil;Stabilization technique;Risk mitigation measures;

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