Variability of the health effects of crystalline silica: Fe speciation in industrial quartz reagents and suspended dusts—insights from XAS spectroscopy

Spectroscopic study of volcanic ashes

“…These values are similar to those of the magnetite reference (Table 3). The Fe-O 1 bond distance matches with that of tetrahedral Fe(III), which is in the range 1.85 -1.88 Å in glasses [39,40] and 1.85 -1.86 Å in crystalline phases [42][43][44]. The longest bond distance (Fe-O 2 ) is in agreement with the average bond distance of Fe in octahedral sites (3 Fe-O at 1.94 Å and 3 Fe-O at 2.12 Å), as reported by [45] for hematite.…”

“…Linear Combination Fitting (LCF) was attempted to reveal the Fe speciation by fitting the experimental spectra with a linear combination of Fe reference compound spectra. The set of Fe references (Figure 1, Supplementary Material) included magnetite, hematite, and ferrihydrite [36,37], pyrite and Fe-sulfate [38], fayalite and almandine [39], and two silicate glasses: natural cambodianite, containing Fe(II) with an average coordination number intermediate between 4 and 5 [27], and the phonolite synthetic glass OIph-1A, containing tetrahedral Fe(III) [40]. This is in agreement with the PCA analysis that suggested that four components are required to reproduce each experimental spectrum satisfactorily.…”

Chemical variability of artificial stone powders in relation to their health effects

“…The metallic and oxidized phases were then related to the overall amplitude by means of a proportional factor and their sum constrained to be 1, thus obtaining an estimation of the ratio between metallic and total Fe content in a manner similar to that described by Di Benedetto et al . 36 (Table 4).…”

The New Beamline LISA at ESRF: Performances and Perspectives for Earth and Environmental Sciences

“…Among the published works based on measurements performed at the beamline in the last few years, we point out the investigation of Tl contamination of the drinkable water from the public distribution system of Valdicastello Carducci-Pietrasanta (northern Tuscany, Italy) [9]; the study of As contamination of floodplain soils and groundwater from shallow aquifers [10,11]; the study of Fe chemical environment in asbestos and erionite mineral fibers [12]; the investigation of selenium (Se) and lead (Pb) accumulation, distribution, and speciation in edible plants [13,14]; the Fe speciation in urban particulate matter and industrial quartz dusts [15,16]; the investigation of amorphous zinc (Zn) biomineralization ("white mud"), occurring at Naracauli stream, Sardinia [17]; the Sb speciation in brake linings, brake pad wear residues, road dust, and atmospheric particulate matter [18]; the interaction of As-rich natural pyrite with aqueous selenite [Se (IV)] [19], and As speciation in travertines [20].…”