Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Arsenic Adsorption onto Pseudomonas aeruginosa Cell Surface

Pseudomonas aeruginosa 표면에 대한 비소의 흡착특성

  • Lee Jong-Un (Microbial Geochemistry Lab.(MIGEL), Department of Geosystem Engineering, Chonnam National University) ;
  • Park Hyun-Sung (Microbial Geochemistry Lab.(MIGEL), Department of Geosystem Engineering, Chonnam National University)
  • 이종운 (전남대학교 지구시스템공학과 미생물지구화학연구실) ;
  • 박현성 (전남대학교 지구시스템공학과 미생물지구화학연구실)
  • Published : 2005.12.01
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Abstract

Adsorption experiments for As(V) and As(III) onto the surfaces of aerobic Pseudomonas aeruginosa, which can be readily isolated from natural media, were conducted under nutrient-absent conditions. While a small amount of As(III) was adsorbed on the bacterial cell surfaces, As(V) was not effectively removed from the solution through adsorption. The result was likely due to the electrostatic repulsion between anionic compounds of aqueous As(V) and cell surfaces of f aeruginosa. However, the bacteria forming biofilm reduced a large amount of aqueous As(V) to As(III), which indicated that microorganisms in most oligotrophic, natural geologic settings can mediate the behavior of aqueous As. Biobarriers designed to remove the various heavy metals in contaminant plume may practically lead to the enhancement of toxicity and mobility of As.

지질매체에서 흔하게 발견되는 호기성 박테리아인 Pseudomonas aeuginosa에 대하여 영양분을 공급하지 않은 상태에서 As(V) 및 As(III) 흡착실험을 수행하였다. As(111)의 경우 P. aeruginosa에 의한 소규모의 흡착이 관찰된 반면, As(V)는 효과적인 흡착이 적용되지 않음을 확인할 수 있었다 이는 As(V)는 수용액 상태에서 음전하 화합물로 존재하고 박테리아 표면 역시 음전하를 띠고 있기 때문에 상호 인력이 작용하지 않기 때문인 것으로 파악된다. 그러나 바이오필름 상태의 박테리아는 많은 양의 용존 As(V)를 As(III)로 환원하는 것으로 나타났다. 이는 빈영양 환경인 대부분의 지질환경에서도 미생물이 용존 비소의 거동에 미치는 영향이 크다는 것을 의미한다. 다양한 중금속으로 오염된 지하수를 처리하기 위하여 구축된 미생물 반응벽체는 비소의 흡착을 촉진하기보다는 오히려 비소의 독성과 이동도를 증가시키는 부의 효과를 유도할 수도 있다.

Keywords

References

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