Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Relationship between Physicochemical Properties, Heavy Metal Contents and Magnetic Susceptibility of Soils

토양의 물리화학적 특성, 중금속 함량, 대자율 간의 상호관계 연구

  • Chon, Chul-Min (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Jeong-Sik (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Jae-Gon (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Youn-Soo (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
  • 전칠민 (한국지질자원연구원 지구환경연구본부) ;
  • 박정식 (한국지질자원연구원 지구환경연구본부) ;
  • 김재곤 (한국지질자원연구원 지구환경연구본부) ;
  • 이윤수 (한국지질자원연구원 지구환경연구본부)
  • Received : 2010.10.05
  • Accepted : 2010.12.08
  • Published : 2010.12.30
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Abstract

This paper deals with magnetic susceptibility, mineralogy, soil properties (pH, EC, CEC, loss on ignition), iron and manganese oxides, the content and partitioning of heavy metals (As, Cd, Cr, Cu, Ni, Pb, Zn), and their mutual relationship in the soil samples of an unpolluted, abandoned mine area, and industrial complex area. The various minerals derived from weathered bedrock were identified by X-ray diffraction in the unpolluted soil samples, except for the magnetic minerals. XRD analysis also revealed the existence of hematite and magnetite related to mine tailings and waste rocks in the abandoned mine area samples. The industrial complex area samples had carbonate minerals, such as calcite and dolomite, that might be due to anthropogenic deposition. The sum of the reducible, oxidizable, and residual fractions was over 80% for the abandoned mine area samples and over 50% for the industrial complex area samples using the sequential extraction method. The industrial complex area samples had a relatively high carbonate fraction that was associated with carbonate minerals. The content of aqua regia-extractable Fe, Mn, As, and Zn had a high positive correlation with the content of the dithionite-citrate-bicarbonate (DCB)-extractable method related to Fe/Mn oxide phases. The 54% and 58% of aqua regia-extractable Fe and As content, respectively, acted together with the concentrations of the DCB-extractable phases. Magnetic susceptibility values of total samples ranged from 0.005 to $2.131{\times}10^{-6}m^3kg^{-1}$. The samples including iron oxide minerals, such as hematite and magnetite, had a high magnetic susceptibility. The magnetic susceptibility showed a significant correlation with the heavy metals, Cd (r=0.544, p<0.05), Cr (r=0.714, p<0.01), Ni (r=0.645, p<0.05), Pb (r=0.703, p<0.01), and Zn (r=0.496, p<0.01), as well as Fe (r=0.608, p<0.01) and Mn (r=0.615, p<0.01). The aqua regia-extractable Fe and Mn content had a significant positive correlation with Cd, Cr, Cu, Ni, and Zn. However, the DCB-extractable Fe and Mn content had a significant positive correlation with As and Ni, indicating that the heavy metals were associated with Fe and Mn oxide minerals.

비오염토양, 폐광산 주변토양, 산업단지 주변토양을 채취하여 X-선 회절분석, pH, 전기전도도, 양이온교환능력, 작열감량, 산화철 산화망간 함량, 중금속 함량 및 중금속 존재형태와 토양대자율의 상관관계를 파악하였다. 시료의 X-선회절분석 정량분석결과 비오염지역 토양에서는 모암에 따라 다양한 광물이 분포하고 있지만, 적철석과 자철석은 거의 관찰되지 않았다. 폐광산 주변토양은 폐광석, 광물찌꺼기 등의 영향으로 적철석이 많이 확인되었고, 일부 시료에서는 자철석도 존재하였다. 산업단지 주변시료에서는 방해석과 철백운석 등의 탄산염 광물들이 대부분의 시료에서 확인되었다. 중금속의 존재형태를 파악하기 위한 연속추출 실험 결과, 폐광산 주변지역 토양시료에서 철, 망간, 중금속 원소들은 reducible, oxidizable, residual 단계별 추출 형태로 80% 이상, 산업단지 주변시료에서는 50% 이상 존재하였다. 산업단지 주변시료의 경우, 탄산염 광물의 영향으로 carbonate 형태가 높게 나타났다. 왕수로 추출된 철, 망간, 비소, 아연 함량은 산화철/산화망간 형태를 지시하는 dithionite-citrate-bicarbonate (DCB) 용출 함량과 매우 밀접한 정의 상관관계를 보여주었다. 철과 비소는 각각 왕수추출함량의 54%, 58%가 산화철/산화망간 형태과 함께 거동하는 것으로 나타났다. 대자율은 $0.005{\sim}2.131{\times}10^{-6}m^3kg^{-1}$의 범위로서, 시료 내에 적철석, 자철석 등 산화철 광물이 존재할 경우 대자율이 높게 측정되었다. 토양 내 중금속 함량과 대자율의 상관관계를 살펴본 결과 철 (r=0.608, p<0.01), 망간(r=0.615, p<0.01)과 유의한 정의 상관관계를 보였으며, 카드뮴(r=0.544, p<0.05), 크롬(r=0.714, p<0.01), 니켈(r=0.645, p<0.05), 납(r=0.703, p<0.01), 아연(r=0.496, p<0.01) 등의 중금속 원소와도 유의한 정의 상관관계를 보였다. 철, 망간 및 중금속원소들 간의 상관관계를 살펴본 결과, 왕수로 용출된 철, 망간 함량과 카드뮴, 크롬, 구리, 니켈, 아연 등의 중금속 함량이 정의 상관관계를 보이고 있다. 또한 산화철 및 산화망간 함량은 비소 및 니켈 함량과 밀접한 상관성이 있는 것으로 나타났다. 이는 비소와 니켈은 산화철 산화망간에 흡착되어 함께 거동함을 암시한다.

Keywords

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