期刊
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
卷 74-75, 期 -, 页码 131-136出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2012.06.052
关键词
Laser-induced breakdown spectroscopy; LIBS; Conflict minerals; Columbite-tantalite; PLSDA
类别
资金
- Army Research Laboratory
- II-VI Foundation
- Coulter Fellowship for the Transfer of Knowledge - Research Scholarship [43644]
Laser-induced breakdown spectroscopy (LIBS) offers a means of rapidly distinguishing different geographic sources for a mineral because the LIBS plasma emission spectrum provides information on the chemical composition (i.e. geochemical fingerprint) of a geomaterial. An application of this approach with potentially significant commercial and political importance is the spectral fingerprinting of conflict minerals such as columbite-tantalite (coltan). Following a successful pilot study of a columbite-tantalite suite from North America. a more geographically diverse set of 57 samples from 37 locations around the world was analyzed using a commercially available LIBS system. The LIBS spectra were analyzed using advanced multivariate statistical signal processing techniques. Partial least squares discriminant analysis (PLSDA) resulted in a correct place-level geographic classification at success rates above 90%. The possible role of rare-earth elements (REEs) as a factor contributing to the high levels of sample discrimination was explored. These results provide additional evidence that LIBS has the potential to be utilized in the field as a real-tirne screening tool to discriminate between columbite-tantalite ores of different provenance. (C) 2012 Elsevier B.V. All rights reserved.
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