Stabilization of As (arsenic(V) or roxarsone) Contaminated Soils using Zerovalent Iron and Basic Oxygen Furnace Slag

영가철(Zerovalent Iron)과 제강슬래그를 이용한 비소(V) 및 록살슨(Roxarsone) 오염토양의 비소 안정화 효율 평가

  • Lim, Jung-Eun (Department of Biological Environment, Kangwon National University) ;
  • Kim, Kwon-Rae (Division of Environmental Science and Ecological Engineering, Korea University) ;
  • Lee, Sang-Soo (Department of Biological Environment, Kangwon National University) ;
  • Kwon, Oh-Kyung (National Academy of Agricultural Science) ;
  • Yang, Jae-E (Department of Biological Environment, Kangwon National University) ;
  • Ok, Yong-Sik (Department of Biological Environment, Kangwon National University)
  • 임정은 (강원대학교 바이오자원환경학과) ;
  • 김권래 (고려대학교 환경생태공학부) ;
  • 이상수 (강원대학교 바이오자원환경학과) ;
  • 권오경 (국립농업과학원) ;
  • 양재의 (강원대학교 바이오자원환경학과) ;
  • 옥용식 (강원대학교 바이오자원환경학과)
  • Received : 2010.01.13
  • Accepted : 2010.06.25
  • Published : 2010.06.30

Abstract

The objective of this study was to evaluate the efficiency of zerovalent iron and basic oxygen furnace slag on arsenic stabilization in soils. For this, arsenic (V) contaminated soil and roxarsone contaminated soil were incubated after incorporation with zerovalent iron (ZVI) or basic oxygen furnace slage (BOFS) at four different levels (0%, 1%, 3%, and 5%) for 30 days and then the residual concentrations of arsenic were analysed following extraction with aqua reqia, 1N HCl and 0.01 M $CaCl_2$. The total concentration of arsenic was 2,285 mg/kg in the As(V) contaminated soil and 6.5 mg/kg in the roxarsone contaminated soil. 1 N HCl extractable arsenic concentration in the As(V) contaminated soil was initially 1,351 mg/kg and this was significantly declined by 713~1,034 mg/kg following incubation with ZVI while BOFS treatment showed no effect on the stabilization of inorganic arsenate except 5% treatment which showed around 100 mg/kg reduction in 1N HCl extractable arsenic. Similarly, in the roxarsone contaminated soil 1N HCl extractable concentration of arsenic was reduced from 3.13 mg/kg to 0.69 mg/kg with ZVI treatment increased from 1% to 5% while BOFS treatment did not lead to any statistically significant reduction. Available (0.01M $CaCl_2$ extractable) arsenic was initially 0.85 mg/kg in the As(V) contaminated soil and this declined by 0.79 mg/kg following incorporation with 5% ZVI, which accounted for more than 90% of the available As in the control. When As(V)-contaminated soil was treated with BOFS, the available arsenic was increased due to competing effect of the phosphate originated from BOFS with arsenate for the adsorption sites. For the roxarsone contaminated soil, the greater the treatment of ZVI or BOFS, the lower the available arsenic concentration although it was still higher than that of the control.

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