Coupling SEM-EDS and confocal Raman-in-SEM imaging: A new method for identification and 3D morphology of asbestos-like fibers in a mineral matrix
| Autor: | Guillaume Wille, Xavier Bourrat, Didier Lahondère, Ute Schmidt, Jéromine Duron |
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| Přispěvatelé: | Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), WITec, Wissenschaftliche Instrumente und Technologie GmbH |
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Materials science 3D analysis Scanning electron microscope Health Toxicology and Mutagenesis Confocal naturally occurring asbestos 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences engineering.material 01 natural sciences Actinolite symbols.namesake Environmental Chemistry fibrous amphiboles Composite material Waste Management and Disposal Quartz Amphibole 0105 earth and related environmental sciences 021110 strategic defence & security studies Mineral Raman-in-SEM imaging Pollution Characterization (materials science) engineering symbols [SDU.OTHER]Sciences of the Universe [physics]/Other Raman spectroscopy in-situ asbestos diagnosis [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
| Zdroj: | Journal of Hazardous Materials Journal of Hazardous Materials, Elsevier, 2019, 374, pp.447-458. ⟨10.1016/j.jhazmat.2019.04.012⟩ |
| ISSN: | 0304-3894 1873-3336 |
| DOI: | 10.1016/j.jhazmat.2019.04.012 |
| Popis: | International audience; Asbestos consists in natural minerals crystallized in a specific habit and possessing in particular properties. In the case of Naturally Occurring Asbestos, usual methods applied to the identification of mineral fibers and the determination of their possible asbestiform nature seems not efficient, especially in the case of mineral fibers included in mineral matrix. We present a new in-situ method based on the use of confocal Raman-in-SEM imaging implemented in a Scanning Electron Microscope as an efficient method for in-situ mineralogy. The limitation of conventional methods is discussed. We applied 2D-Raman imaging to the identification of sub-micrometric fibers included in different mineral matrix. We were able to identify actinolite fibers down to 400 nm in diameter, included in feldspar, quartz and/or calcite matrix. Moreover, Confocal Raman allows the collection of 3D data that would provide access to critical information on the morphology of the amphibole fibers in the volume, such as aspect ratio, fibers distribution and amphibole volume fraction. We performed this method on various examples of rocks containing actinolite fibers of mean structural formula is: Na0,04-0,12Mg2,79-3,73Al0,29-0,58K0,01Ca1,79-1,98Mn0,01-0,09Fe 2+ 0,99-1,91Fe 3+ 0,12-0,25Si7,64-7,73O22(OH)2. We demonstrated that coupling confocal Raman imaging and SEM is a new and efficient in-situ method for identification and morphological characterization of amphibole fibers. Highlights New methods are requested for characterizing asbestos fibers in a mineral matrix SEM-Raman imaging is efficient for characterizing mineral fibers in-situ Confocal Raman imaging makes 3D analysis possible 3D analysis provides information on the aspect ratio and volume fraction of asbestos Fibers thinner than 400nm can be identified by confocal Raman in SEM ( = 532 nm) |
| Databáze: | OpenAIRE |
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