Vibrational spectroscopic studies of asbestos and comparison of suitability for remote analysis

Lewis, Ian R.; Chaffin, Nathan C.; Gunter, Mickey E.; Griffiths, Peter R.

doi:10.1016/0584-8539(95)01560-4

Cited by 59 publications

(51 citation statements)

References 5 publications

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“…For tremolite Ðbres, the results are in agreement with those of Blaha and Rosasco8 even though the Ñuores-cence background covers some bands. The anthophyllite spectrum5h7 is close to the tremolite spectrum of Lewis et al 4 A comparison of the spectra of Ðbrous and non-Ðbrous samples of the same mineral shows no evident change in the 200È1200 cm~1 region. However, the hydroxyl stretching region presents di †erences in the number of bands.…”

Section: Methodsmentioning

confidence: 54%

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Asbestos fibre identification by Raman microspectroscopy

Bard

Yarwood

Tylee

1997

J. Raman Spectrosc.

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Raman microspectroscopy has been shown to be a very powerful technique for the identiÐcation and characterization of small mineral Ðbres, with little or no sample preparation. Such spectra are sensitive to the composition of the mineral and can often be used to distinguish between similar species. The technique can be employed for the identiÐcation of single micrometre-sized Ðbres. Vibrational spectra were obtained from Ðve asbestos reference standards for comparison with four non-Ðbrous analogues. The di †erent species such as amosite, anthophyllite, chrysotile, crocidolite and tremolite give distinct spectra. Apparently no important di †erences appear between spectra of asbestos Ðbres and their non-Ðbrous forms, except in the OH-stretching region. For each spectrum, all peaks were listed in order to determine spectral features. The reference spectra were used for the identiÐcation of known and unknown (industrial samples) Ðbres on cellulose acetate Ðlters.

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Section: Methodsmentioning

confidence: 54%

“…Only tremolite has been studied by comparison with the non-Ðbrous form by Raman spectroscopy. 8 Lewis et al 4 used the technique to analyse pieces of asbestos waste.…”

Section: Introductionmentioning

confidence: 99%

Asbestos fibre identification by Raman microspectroscopy

Bard

Yarwood

Tylee

1997

J. Raman Spectrosc.

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“…The sharp bands at 3617 and 3633 cm −1 appeared in the range of stretching vibration of OH − groups and are related to the values obtained by Lewis et al, 1996 on crocidolite studied using infrared (IR) spectroscopy [61]. Nevertheless, these bands were not detected on the spectra from non-dark areas, where a minor polarizability occurs for the absence of C-rich phases and only the bands provided by crocidolite in the low spectral range could be observed.…”

Section: Discussionmentioning

confidence: 99%

Raman Micro-Spectroscopy Identifies Carbonaceous Particles Lying on the Surface of Crocidolite, Amosite, and Chrysotile Fibers

2018

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Micro-Raman spectroscopy has been applied on UICC (Union for International Cancer Control's) crocidolite and amosite from South Africa and on UICC chrysotile from Canada. Under Optical Microscope (OM), the surface of the fibers was often characterized by areas, micrometric in size, appearing dark. The laser beam was successively focused on areas of the same sample showing different optical contrasts. On the bright zones, Raman spectra peculiar for crocidolite, amosite or chrysotile were recorded. When dark areas were optically identified, the laser beam was addressed onto these regions and, in the Raman patterns, in addition to the bands produced by the mineral fiber, bands ascribing to substituted carbonaceous phases were observed. These bands were lying in the 4000-1100 cm −1 spectral range. On the basis of the shape of the bands and their relative intensities, suggestions about the order-disorder of the carbonaceous particles could be proposed, and they appeared more ordered on amosite than on crocidolite and chrysotile. From the exposed data, crocidolite and amosite fibers from South Africa, and chrysotile fibers from Canada, largely used in industry in the past, are characterized by many carbonaceous micrometric particles, lying on the fiber surfaces. Based on the noxiousness of the carbon particles on human health, their presence on asbestos fibers may play a role in increasing the carcinogenic effects of the analyzed fibrous minerals.

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“…4. Chrysotile (a) displays the typical external OH stretch and inner OH stretch at 3696 and 3644 cm −1 , respectively [22,23]. A broad band at 3446 and 1630 cm −1 , attributed to adsorbed/absorbed water molecules.…”

Section: Resultsmentioning

confidence: 97%