Journal of Soil and Groundwater Environment (한국지하수토양환경학회지:지하수토양환경)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
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Assessment of Risk Based Pollution Level of Pb and Cd in Metal Contaminated Soils Using Biotic Ligand Model

Biotic ligand model에 근거한 중금속 오염지역의 Pb 및 Cd 위해오염도 평가기법 개발

  • An, Jin-Sung (Dept. of Civil and Environmental Engineering, Seoul National University) ;
  • Jeong, Seul-Ki (Dept. of Civil and Environmental Engineering, Seoul National University) ;
  • Moon, Hee-Sun (School of Earth and Environmental Sciences, Seoul National University) ;
  • Nam, Kyoung-Phile (Dept. of Civil and Environmental Engineering, Seoul National University)
  • 안진성 (서울대학교 공과대학 건설환경공학부) ;
  • 정슬기 (서울대학교 공과대학 건설환경공학부) ;
  • 문희선 (서울대학교 자연과학대학 지구환경과학부) ;
  • 남경필 (서울대학교 공과대학 건설환경공학부)
  • Received : 2011.02.16
  • Accepted : 2011.08.01
  • Published : 2011.08.31
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Abstract

Risk based pollution level of Pb and Cd in metal contaminated soils depending on physicochemical properties of soil in a target site was assessed using biotic ligand model. Heavy metal activity in soil solution defined as exposure activity (EA) was assumed to be toxic to Vibrio fischeri and soil organisms. Predicted effective activity (PEA) determined by biotic ligand model was compared to EA value to calculate risk quotient. Field contaminated soils (n = 10) were collected from a formes area and their risk based pollution levels were assessed in the present study using the calculated risk quotient. Concentrations of Pb determined by aqua regia were 295, 258, and 268 mg/kg in B, H and J points and concentrations of Cd were 4.73 and 6.36 mg/kg in G and I points, respectively. These points exceeded the current soil conservation standards. However, risk based pollution levels of the ten points were not able to be calculated because concentrations of Pb and Cd in soil solution were smaller than detection limits or one (i.e., non toxic). It was because heavy metal activity in soil solution was dominant toxicological form to organisms, not a total heavy metal concentration in soil. In addition, heavy metal toxicity was decreased by competition effect of major cations and formation of complex with dissolved organic carbon in soil solution. Therefore, it is essential to consider site-specific factors affecting bioavailability and toxicity for estimating reliable risk of Pb and Cd.

Keywords

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