Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Distribution of Organic and Inorganic Arsenic Species in Groundwater and Surface Water Around the Ulsan Mine

울산광산 주변지역 수계에서 유기 및 무기 비소 종 분포

  • Kim, Youn-Tae (Department of Earth System Sciences, Yonsei University) ;
  • Woo, Nam-Chil (Department of Earth System Sciences, Yonsei University) ;
  • Yoon, Hye-On (Hazardous Substance Research Team, Korea Basic Science Institute) ;
  • Yoon, Cheol-Ho (Hazardous Substance Research Team, Korea Basic Science Institute)
  • 김연태 (연세대학교 지구시스템과학과) ;
  • 우남칠 (연세대학교 지구시스템과학과) ;
  • 윤혜온 (한국기초과학지원연구원 유해물질분석팀) ;
  • 윤철호 (한국기초과학지원연구원 유해물질분석팀)
  • Published : 2006.12.30
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Abstract

Distribution and speciation of arsenic in water resources was investigated in the Ulsan mine area. In 62% of uoundwater samples from the mine area, total As concentrations exceeded 0.05 mg/l, the Korean Drinking Water Standard. As(V) was the major type in groundwater with minor As(III). Arsenic species appeared to be in transition stages following redox changes after exposure to the air through the monitoring wells. In areas around the mine, the mine and Cheongog spring appeared to be the sources of arsenic contamination of water resources. The spring showed 0.345 mg/1-As, as much as seven times of the Korean standard. Groundwater and stream samples showed As-concentrations greater than 0.05 mg/l in 30% and 33% samples, respectively, and 60 and 67% of samples exceeded 0.01 mg/l of WHO guideline, respectively. Again, As(V) was a dominant species, however, several samples had As(III) in appreciable levels. In one stream sample, organic species including DMA and AsB were detected in low levels, probably resulted from transformation or related biogeochemical processes.

비소 오염이 심각한 것으로 알려진 울산광산과 인근지역의 수환경에 대한 비소 오염도와 종 분포 특성을 조사하였다. 채취한 광산 내 지하수 시료의 62%에서 우리나라 먹는물 수질 기준인 0.05 mg/l를 초과하는 비소 농도가 검출되었다. 비소는 모두 무기종으로, As(V)가 우세하고 일부 지점에서 As(III)이 검출되었다. 지하수 내 비소는 관측정을 통한 산화환원환경의 변화로 인해 새로운 평형으로 이동하는 과정 중으로 유추된다. 주변수계는 울산광산과 천곡약수가 비소의 주 오염원으로 파악되며, 지하수와 하천수 시료의 $30{\sim}33%$가 총 비소농도 0.05 mg/l를, $60{\sim}67%$ 시료가 0.01 mg/l를 초과하였다. 특히 천곡약수는 0.345 mg/l의 비소 농도를 보여 먹는물 수질기준의 7배에 달하는 오염도를 보인다. 지하수와 천곡약수에서 비소는 모두 As(V) 형태로 존재하였으나, 농도가 높은 일부 지점에서는 As(III)이 검출되었다. 한 지점에서는 DMA, AsB와 같은 유기비소가 소량 검출되어, 비소의 종 변이 또는 유기적 기작의 관련성을 제시한다.

Keywords

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