Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Arsenic Movement in the Soils around a Closed Zinc Mine

폐 아연 광산 주변 토양에서 비소의 이동양상

  • Seo, Young-Jin (Gyeongsangbukdo Agriculture Research and Extension Services) ;
  • Choi, Jyung (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Kang, Yun-Ju (Gyeongsangnbukdo Government Public Institute of Health and Environment) ;
  • Park, Man (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Kim, Kwang-Seop (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Lee, Young-Han (Gyeongsangnamdo Agriculture Research and Extension Services) ;
  • Komarneni, Sridhar (205 Material Research Laboratory, The Pennsylvania State University)
  • 서영진 (경상북도농업기술원) ;
  • 최정 (경북대학교 농화학과) ;
  • 강윤주 (경상북도보건환경연구원) ;
  • 박만 (경북대학교 농화학과) ;
  • 김광섭 (경북대학교 농화학과) ;
  • 이영한 (경상남도농업기술원) ;
  • Received : 2010.01.20
  • Accepted : 2010.01.29
  • Published : 2010.02.28
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Abstract

The sediments and soils around a mine are likely to be exposed to contamination of arsenic (As) through mining operations. In this study, the factors associated with As movement in soils around a closed zinc (Zn) mine were evaluated by the relationship of As distributions to physico-chemical properties of soils. A sequential extraction scheme, based on a soil P fractionation, was used to assess the As distributionsin solid phases. A significant difference in As distributions was found between paddy and upland soils. While As contents of paddy soils increased with soil depth, those of upland soils decreased with soil depth. In upland soils, As showed additional significant relationships to oxides of Si, Al and Fe. Although a major fraction of As in soils was found to be in the NaOH extractable fraction, As exhibited highly significant relationship to the Zn species that apparently originated from the mine. Therefore, As mobility around Zn mine seems to be governed by mass flow of the particulates containing As-associated Zn in paddy soils, whereas retention reactions such as adsorption, complexation, and precipitation seem to predominate in upland soils.

광산 주변 토양 및 하천퇴적물은 광산활동기간 뿐만 아니라 폐광 이후에도 비소 (As)의 오염에 노출될 가능성이 높다. 본 연구에서는 아연 (Zn) 광산 주변 토양의 비소 이동 특성을 규명하기 위한 방법으로 토양 중 비소의 분포와 토양이화학성과의 상관관계를 조사하였다. 인 분획법 (P fractionation) 을 이용하여 토양중 비소의 분포 특성을 조사한 결과, 논토양과 밭토양에서 큰 차이를 나타내었다. 논토양의 비소함량은 깊이가 깊어짐에 따라 증가하였으나, 밭토양은 감소하였다. 또한 밭토양에서 비소는 Si, Al 및 Fe 산화물과 밀접한 상관관계를 보였다. 토양에서 비소는 주로 NaOH용액으로 추출가능한 형태로 발견되었지만, 광산으로부터 유입된 아연과도 높은 상관관계를 보였다. 포화상태의 수리조건이 형성되는 논토양과 비교적 건조한 상태인 밭상태에서 비소의 분포양상이 다르고 이들의 상관관계 결과를 고려할 때 비소의 이동에 물의 영향은 매우 결정적인 요인으로 작용하였다. 특히 논토양에서 비소의 이동은 공극을 통한 물의 mass flow에 영향을 받는 반면, 밭토양에서는 교질표면에 비소의 adsorption, surface complexation, surface precipitation등 retention 반응에 더 큰 영향을 받는 것으로 판단되었다.

Keywords

References

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