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Application of X-ray Absorption Spectroscopy (XAS) in the Field of Stabilization of As and Heavy Metal Contaminated Soil

비소 및 중금속 오염토양 안정화 분야에서의 X선 흡수분광법(XAS) 활용

  • Lim, Jung Eun (Korea Biochar Research Center & Department of Biological Environment, Kangwon National University) ;
  • Moon, Deok Hyun (Department of Environmental Engineering, Chosun University) ;
  • Kim, Kwon-Rae (Department of Agronomy and Medicinal Plant Resources, Gyeongnam National University of Science and Technology) ;
  • Ok, Yong Sik (Korea Biochar Research Center & Department of Biological Environment, Kangwon National University)
  • Received : 2014.11.13
  • Accepted : 2015.01.12
  • Published : 2015.03.31

Abstract

X-ray absorption fine structure (XAFS) analysis using X-ray absorption spectroscopy is being applied as a state-of-the-art method in a wide range of disciplines. This review article summarizes the overall procedure of XAFS analysis from the preparation of soil samples to the analysis of data in X-ray absorption near edge structure (XANES) region and extended Xray absorption fine structure (EXAFS) region. The previous studies on application of XANES and EXAFS techniques in environmental soil science field are discussed and classified them according to metal(loid)s (As, Cd, Cu, Ni, Pb, and Zn). A significant number of previous studies of XAFS application in the environmental soil science field have focused on the identification of Pb chemical species in soil. Moreover, XANES and EXAFS techniques have been widely used to investigate the contamination source via identification of metal species. Similarly, these techniques were applied to identify the mechanisms of metal stabilization in soil after application of various amendments, phytoremediation, etc.

X선 흡수분광법(X-ray absorption spectroscopy, XAS)을 이용하는 X선 흡수미세구조(X-ray absorption fine structure, XAFS)의 분석은 다양한 학문분야에서 적용되고 있다. 본 연구에서는 XAFS 분석을 위한 토양 시료의 준비에서부터 XAFS 측정 후 X선 흡수 끝머리 부근 미세구조(X-ray absorption near edge structure, XANES) 및 광범위 X선 흡수 미세구조(extended Xray absorption fine structure, EXAFS) 데이터를 추출하여 연구에 활용하는 것에 대해 간략하게 소개하였다. 특히 토양환경 분야에서 XANES 및 EXAFS 분석을 활용한 선행연구들에 대해 비소(As) 및 중금속 주요 원소(Cd, Cu, Ni, Pb, Zn)별로 그 내용을 정리하였다. 토양환경 분야에서 XAFS의 응용은 납(Pb)의 화학종 규명에 관한 연구가 가장 많은 것으로 나타났다. 이와 함께 대부분의 연구들은 오염토양 내 중금속 화학종의 규명을 통해 중금속의 유입 원인 등에 대해 기술하고 있으며, 이를 정화하기 위한 다양한 방법들(개량제 처리, 식물정화)을 적용한 후, 안정화된 중금속 화학종을 XANES 및 EXAFS 분석을 통해 규명하여 정화 방법들의 효율성과 안정성에 대해 보고하였다.

Keywords

References

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