Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Geochemical Investigation on Arsenic Contamination in the Alluvial Ground-water of Mankyeong River Watershed

만경강유역 충적대수층 지하수의 비소오염현황 및 지구화학적 특성

  • Moon, Jeong-Tae (School of Civil and Environmental Engineering, Kunsan National University) ;
  • Kim, Kang-Joo (School of Civil and Environmental Engineering, Kunsan National University) ;
  • Kim, Seok-Hwi (School of Civil and Environmental Engineering, Kunsan National University) ;
  • Jeong, Cheon-Sung (School of Civil and Environmental Engineering, Kunsan National University) ;
  • Hwang, Gab-Soo (School of Civil and Environmental Engineering, Kunsan National University)
  • Published : 2008.12.28
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Abstract

As-rich alluvial groundwaters occurring in the agricultural area of Mankyeong River watershed were geochemically studied. 15 out of 29 investigated wells (52%) showed As levels exceeding the WHO drinking water standard ($10{\mu}g/L$). Their chemistry is characterized by low Eh levels, low $NO_3$ and $SO_4$ concentrations, and high pH, alkalinity, Fe, $NH_4$, and $PO_4$ levels. This suggests that arsenic is enriched by the reductive dissolution of As-bearing Fe-/Mn-(hydro)oxides, the commonest process in Bangladesh and West Bengal of India, of which groundwaters are severely contaminated by As. It was also revealed that As concentrations in the area are strongly regulated by the presence of agrochemicals such as $NO_3$ and $SO_4$.

본 연구에서는 만경강에 의해 형성된 충적대수층에서 나타나는 고비소지하수를 지구화학적으로 고찰하였다. 연구지역에서는 조사된 관정 29개 중 15개에 해당하는 총 52%가 WHO의 비소 먹는물기준치($10{\mu}g/L$)를 초과하는 것으로 조사되었다. 비소가 부화된 지하수는 다른 지하수에 비하여 낮은 Eh값과 낮은 $NO_3$ 및 $SO_4$농도, 그리고 높은 pH, alkalinity와 Fe, $NH_4$ 및 $PO_4$농도를 보였다. 이는 세계최대의 비소오염지역인 벵갈만 충적층지역에서 흔히 관찰되는 비소용출기작인 철, 망간수산화물의 환원적 용해현상과 일치하는 수질특성이며, 국내의 충적층 지하수도 비소오염으로부터 자유롭지 못함을 지시하는 결과이기도 하다. 특히, 연구지역에서는 농업기원화학종인 $NO_3$와 $SO_4$의 존재가 비소 농도를 낮추는데 크게 공헌함으로써 농업활동이 비소의 농도를 낮추는 역할을 하였다.

Keywords

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