Journal of Soil and Groundwater Environment (한국지하수토양환경학회지:지하수토양환경)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
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Study on Soil Extraction Methods for the Human Health Risk Assessment of Crop Intake Pathway around Abandoned Metal Mine Areas

폐금속광산 지역 농작물섭취경로의 인체위해도 산정을 위한 생물농축계수와 토양분석방법에 관한 연구

  • Lim, Tae-Yong (Department of Geology and Research Institute of Natural Science (RINS), Gyeongsang National University (GNU)) ;
  • Lee, Sang-Woo (Department of Geology and Research Institute of Natural Science (RINS), Gyeongsang National University (GNU)) ;
  • Yun, Seong-Taek (Department of Earth and Environmental Sciences, Korea University) ;
  • Kim, Soon-Oh (Department of Geology and Research Institute of Natural Science (RINS), Gyeongsang National University (GNU))
  • 임태용 (경상대학교 지질과학과 및 기초과학연구소) ;
  • 이상우 (경상대학교 지질과학과 및 기초과학연구소) ;
  • 윤성택 (고려대학교 지구환경과학과) ;
  • 김순오 (경상대학교 지질과학과 및 기초과학연구소)
  • Received : 2016.09.09
  • Accepted : 2016.11.07
  • Published : 2016.12.31
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Abstract

Generally, the contribution of crop-intake pathway (CIP) is remarkable in human health assessment (HHA) of heavy metal contamination. Although the crop exposure concentrations (Cp) should directly be used for calculating the average daily dose (ADD) of CIP, the soil exposure concentration (Cs) multiplied by soil-crop bio-concentration factor (BCF) has frequently been used instead of using Cp values. Thus, the BCF values are significant in the HHA, and care should be taken to ensure the reasonable acquisition of BCF values. Meanwhile, the BCF values are known to be significantly affected by analytical methods. Nevertheless, they have been calculated from the concentrations of soil and crop analyzed by only one method: total digestion (aqua regia extraction). For this reason, this study was initiated to seek appropriate soil analysis methods for effective computation of the ADD of CIP. The concentrations of 5 metal contaminants (As, Cd, Cu, Pb, and Zn) in 127 soil samples obtained from 4 abandoned metal mine areas were analyzed by several methods including total digestion and partial digestions using 0.1/1 N HCl, 1M $NH_4NO_3$, 0.1 M $NaNO_3$, and 0.01M $CaCl_2$. The heavy metal concentrations in 127 crop samples (rice grains) were analyzed by total digestion as well. Using the concentrations of soils and crops, the BCF values of each contaminant were calculated according to the kind of soil extraction methods applied. Finally, the errors between Cp and $C_s{\times}BCF$ were computed to evaluate the relevance of each method. The results indicate that the partial extraction using 0.1 N and 1 N HCl was superior or equivalent to total digestion. In addition, the 0.1M $NaNO_3$ method combined with total digestion is recommended for improving the reliability of BCF values.

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References

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