Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Quantitative Determination of Fe-oxidation State by Electron Energy Loss Spectroscopy (EELS)

전자에너지 손실분광 분석법을 이용한 정량적 철산화수 측정

  • Yang, Ki-Ho (Department of Earth System Sciences, Yonsei University) ;
  • Kim, Jin-Wook (Department of Earth System Sciences, Yonsei University)
  • 양기호 (연세대학교 지구시스템과학과) ;
  • 김진욱 (연세대학교 지구시스템과학과)
  • Received : 2012.03.29
  • Accepted : 2012.04.20
  • Published : 2012.04.28
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Abstract

The consequences of microbe-mineral interaction often resulted in the chemical, structural modification, or both in the biologically induced mineral. It is inevitable to utilize the high powered resolution of electron microscopy to investigate the mechanism of biogenic mineral transformation at nano-scale. The applications of transmission electron microscopy (TEM) capable of electron energy loss spectroscopy (EELS) to the study of microbe-mineral interaction were demonstrated for two examples: 1) biogenic illite formation associated with structural Fe(III) reduction in nontronite by Fereducing bacteria; 2) siderite phase formation induced by microbial Fe(III) reduction in magnetite. In particular, quantification of the changes in Fe-oxidation state at nanoscale is essential to understand the dynamic modification of minerals resulted from microbial Fe reduction. The procedure of EELS acquisition and advantages of EELS techniques were discussed.

생지화학적 반응으로 생성된 광물은 화학적 혹은 구조적 변화를 보여주고 있다. 이러한 광물형성의 메커니즘을 밝히기 위해서는 고해상도를 가진 전자현미경을 이용한 나노스케일 분석이 불가피 하다. 투과전자현미경에 장착되어있는 전자에너지 손실분광 분석법 (EELS)을 이용하여 미생물-광물반응 시 일어나는 현상을 두 가지의 예를 들어서 설명하고자 한다. 1) 철 환원 박테리아에 의한 논트로나이트 의 일라이트 로의 전이; 2) 자철석의 환원으로 인한 능철석의 형성. 특히 철산화/환원의 정량적 분석을 통하여 시간적 변화에 따른 철 산화도 측정은 생지화학적 광물변화에 대한연구를 용이하게 해준다. 따라서 본 논문은 EELS의 분석방법 및 장점을 소개함을 목적으로 한다.

Keywords

References

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