Quantifying the A-site occupancy in amphiboles: a Raman study in the OH-stretching region

Sbroscia, Marco; Ventura, Giancarlo Della; Iezzi, Gianluca; Sodo, Armida

doi:10.1127/ejm/2018/0030-2727

Cited by 9 publications

(6 citation statements)

References 35 publications

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“…The data presented here can be used as reference spectra for environmental/toxicological studies were vibrational spectroscopy is used as an analytical tool. Our study shows that, based on a vast body of literature, mostly summarized in [21] and [26], the FTIR spectra in the OH-stretching region provide a relatively easy and rapid identification of the amphibole asbestos minerals; this task is eased by the fact that all asbestos amphiboles have a vacant A-site, a feature that has a strong effect on the IR spectra [21], [30] and references therein. Considering that the exact wavenumbers of the OH-stretching bands are also sensitive, albeit weakly, to the nextnearest neighbours, i.e.…”

Section: Discussionmentioning

confidence: 89%

“…Amphiboles may crystallize in several different space groups, but the C2/m is by far the most common [28]. Their OH-stretching (3000 to 4000 cm -1 ) FTIR and Raman spectra are very similar and show identical band multiplicity and band wavenumbers [25][26]29]; by contrast, band intensities can be significantly different, a feature that has important consequences in quantitative analysis [30]. At low frequency, the lattice mode region (<1200 cm -1 ) can display a large number of peaks for a C2/m amphibole [29].…”

Section: Vibrational Spectroscopy Applied To the Crystal Chemistry Ofmentioning

confidence: 99%

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FTIR Spectroscopy of the Regulated Asbestos Amphiboles

Ventura¹,

Vigliaturo²,

Gieré³

et al. 2018

Preprint

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Vibrational spectroscopies (FTIR, Raman) are exceptionally valuable tools for the identification and crystal-chemical study of fibrous minerals, and asbestos amphiboles in particular. Raman spectroscopy has been widely applied in toxicological studies and thus a large corpus of reference data on regulated species is found in the literature. However, FTIR spectroscopy has been mostly used in crystal-chemical studies and very few data are found on asbestos amphiboles. This paper is intended to fill this gap; we report new FTIR data collected on a suite of well-characterized samples of the five regulated amphibole species: anthophyllite, amosite and crocidolite, provided by the Union for International Cancer Control (UICC) Organization, and tremolite and actinolite, from two well-known occurrences. The data from these reference samples have been augmented by results from additional specimens to clarify some aspects of their spectroscopic features. We show that the FTIR spectra in both the OH-stretching region and in the lattice modes region can be effective for rapid identification of the asbestos type.

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Section: Discussionmentioning

confidence: 89%

Section: Vibrational Spectroscopy Applied To the Crystal Chemistry Ofmentioning

confidence: 99%

FTIR Spectroscopy of the Regulated Asbestos Amphiboles

Ventura¹,

Vigliaturo²,

Gieré³

et al. 2018

Preprint

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“…Theses C-sites are usually occupied in nephrites by Mg 2+ and Fe 2+ ions. The frequency of the OH stretching vibrations is then influenced by the population of the 3 nearest C-sites [11,12,20,23]. The OH stretching mode shows a two-mode behaviour, meaning that for every different atomic configuration, a different Raman peak arises [20].…”

Section: Resultsmentioning

confidence: 99%

Composition of Amphiboles in the Tremolite–Ferro–Actinolite Series by Raman Spectroscopy

et al. 2019

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Amphiboles are an important family of rock forming minerals, whose identification is crucial in provenance studies as well as in many other fields of geology, archaeology and environmental sciences. This study is aimed to find a quick way to characterize Ca-amphiboles in the tremolite (Ca2Mg5Si8O22(OH)2)–ferro–actinolite (Ca2Fe5Si8O22(OH)2) series. Raman spectroscopy is established as technique to perform non-destructive and quick analysis, with micrometric resolution, able to give the composition in terms of Mg/(Mg + Fe2+) ratio. To exploit the method, a preliminary characterization is performed by Scanning Electron Microscopy coupled with Energy-dispersed X-ray Spectroscopy (SEM-EDS). Two independent methods to evaluate the composition from the Raman data (aiming to an accuracy of about 5%), using the low-wavenumbers part of the spectrum and the OH stretching bands, are developed. The application of the proposed method to micro-Raman mappings and the possible use of handheld Raman spectroscopy to have compositional information on Ca-amphiboles are discussed.

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“…Amphiboles may crystallize in several different space groups, but the C 2/ m is by far the most common [28]. Their OH-stretching (3000 to 4000 cm −1 ) FTIR and Raman spectra are very similar and show identical band multiplicity and band wavenumbers [25,26,29]; by contrast, band intensities can be significantly different, a feature that has important consequences in quantitative analysis [30]. At low frequency, the lattice mode region (<1200 cm −1 ) can display a large number of peaks for a C 2/ m amphibole [29].…”

Section: Vibrational Spectroscopy Applied To the Crystal Chemistry Ofmentioning

confidence: 99%

Infra Red Spectroscopy of the Regulated Asbestos Amphiboles

et al. 2018

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Vibrational spectroscopies (Fourier Transform Infra Red, FTIR, and Raman) are exceptionally valuable tools for the identification and crystal–chemical study of fibrous minerals, and asbestos amphiboles in particular. Raman spectroscopy has been widely applied in toxicological studies and thus a large corpus of reference data on regulated species is found in the literature. However, FTIR spectroscopy has been mostly used in crystal–chemical studies and very few data are found on asbestos amphiboles. This paper is intended to fill this gap. We report new FTIR data collected on a suite of well-characterized samples of the five regulated amphibole species: anthophyllite, amosite, and crocidolite, provided by the Union for International Cancer Control (UICC) Organization, and tremolite and actinolite, from two well-known occurrences. The data from these reference samples have been augmented by results from additional specimens to clarify some aspects of their spectroscopic features. We show that the FTIR spectra in both the OH-stretching region and in the lattice modes region can be effective for rapid identification of the asbestos type.

show abstract

Quantifying the A-site occupancy in amphiboles: a Raman study in the OH-stretching region

Cited by 9 publications

References 35 publications

FTIR Spectroscopy of the Regulated Asbestos Amphiboles

FTIR Spectroscopy of the Regulated Asbestos Amphiboles

Composition of Amphiboles in the Tremolite–Ferro–Actinolite Series by Raman Spectroscopy

Infra Red Spectroscopy of the Regulated Asbestos Amphiboles

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