Application of Raman Spectroscopy on asbestos fibre identification

Asbestos health hazard: A spectroscopic study of synthetic geoinspired Fe-doped chrysotile

“…In the II frequency range, where stoichiometric chrysotile shows the characteristic absorption bands which are typical for Si-O-Si stretching vibration of the silica network, Fe-doped chrysotile ( X ) reveals the shift of the 961 cm −1 to higher frequencies and the shift of the 1013 cm −1 to lower frequencies, resembling the single band of the in-plane Si-O stretch of lizardite at 1010 cm −1 [31]. These two shifts are evident for Fe-doped chrysotile nanocrystals ( X ) also at low Fe doping extent.…”

“…4a and the observed bands are compared in Table 3 with the data from literature 31 to 33 where a shift of 2-4 cm −1 towards higher values of vibrational frequencies is appreciated. It must be noted that the chrysotile studied in the literature works [31][32][33] was natural chrysotile, where the octahedral Mg is frequently substituted by different cations, especially Fe 2+ and/or Al; this last element replacing also Si in the tetrahedra. It is therefore not surprising to find the frequencies of the vibrational modes shifted towards higher values when the occupancy of the octahedral sites is realized only by Mg and the tetrahedral positions only by Si, as expected in the stoichiometric chrysotile.…”

“…Fitting program applied to this band reveals two components: the main at 694 cm −1 and a weak one at 706 cm −1 (Fig. 4b), ascribing respectively to symmetric stretching modes ( s ) of the Si-O b -Si linkages and to Mg-OH translation modes [31][32][33] (Table 3).…”

“…The calibration of the instrument was performed before every run by checking the position of the Si band at 520.7 cm −1 . As detected in previous works, at wave numbers ranging from 1000 to 1500 cm −1 wide fluorescence bands were observed [31,32], therefore only the spectral region ranging from 1000 to 200 cm −1 was analyzed. On the other hand, this is the part of the Raman spectrum corresponding to lattice vibrational modes and it was identified by Rinaudo and co-workers [33] as characteristic for distinguishing serpentine minerals.…”

Predictive assessment of the asbestos content in the Western Italian Alps: an essential tool for an effective approach to risk analysis and management in tunneling operations and muck reuse

“…It should be important to consider that, during these early investigations, the microscopic relationships between the fibrous phases and other minerals are very important. MicroRaman spectroscopy on raw samples and/or thin sections (Rinaudo et al 2005;Groppo et al 2006) is at present considered a very promising technique for the identification of the fibrous phases in the field of earth sciences, since it is fast, non-destructive and without the need to prepare samples.…”