In this work, a new micro-analytical SEM-method to perform quantitative chemical analyses of mineral fibers is described. The method makes it possible to correct the EDS results of fiber analyses, obtained by means of the conventional procedure (i.e., ZAF) utilizing, as compositional reference “standards,”������������������������ small fragments of massive crystals�s� s� s� s� s� whose composition was previously determined by Electron Microprobe (EMPA). The method reduces the errors in evaluating the chemical composition of fibers due to two principal effects: “absent mass” and “reduced absorption” ” related to the small size of the fibers. The correct quantitative analyses of the fibers were obtained on the base of: a) the trends (i.e., regression equations) of the element concentrations in the “standard fragments” ” (as obtained by ZAF correction) versus the fragment sizes; b) the setting of correction factors through the ratio between the true element concentrations (as determined by EPMA in the massive crystal) and the apparent element concentrations revealed by the regression equations; and c) the evaluation of the correction factor errors through the residual dispersions (standard deviation σ) around the curves. The method was applied for the first time on the fluoro-edenite amphibole fibers found in Biancavilla area, to obtain quantitative chemical analyses. The unequivocal chemical characterization of this fibrous material is extremely important to verify their effective toxicity in environmental and health issues. The micro-analytical method was also applied to fibers of fluor-richterite amphibole to confirm its validity on fibers with higher compositional variability.

A microanalytical SEM-EDS method applied to the quantitative chemical compositions of fibrous amphiboles / Paoletti, L; Bruni, B. M.; Arrizza, L; S., Tagliani; Pacella, Alessandro; Gianfagna, Antonio. - In: PERIODICO DI MINERALOGIA. - ISSN 0369-8963. - STAMPA. - 77:(2008), pp. 63-73. [10.2451/2008PM0014]

A microanalytical SEM-EDS method applied to the quantitative chemical compositions of fibrous amphiboles.

PACELLA, Alessandro;GIANFAGNA, Antonio
2008

Abstract

In this work, a new micro-analytical SEM-method to perform quantitative chemical analyses of mineral fibers is described. The method makes it possible to correct the EDS results of fiber analyses, obtained by means of the conventional procedure (i.e., ZAF) utilizing, as compositional reference “standards,”������������������������ small fragments of massive crystals�s� s� s� s� s� whose composition was previously determined by Electron Microprobe (EMPA). The method reduces the errors in evaluating the chemical composition of fibers due to two principal effects: “absent mass” and “reduced absorption” ” related to the small size of the fibers. The correct quantitative analyses of the fibers were obtained on the base of: a) the trends (i.e., regression equations) of the element concentrations in the “standard fragments” ” (as obtained by ZAF correction) versus the fragment sizes; b) the setting of correction factors through the ratio between the true element concentrations (as determined by EPMA in the massive crystal) and the apparent element concentrations revealed by the regression equations; and c) the evaluation of the correction factor errors through the residual dispersions (standard deviation σ) around the curves. The method was applied for the first time on the fluoro-edenite amphibole fibers found in Biancavilla area, to obtain quantitative chemical analyses. The unequivocal chemical characterization of this fibrous material is extremely important to verify their effective toxicity in environmental and health issues. The micro-analytical method was also applied to fibers of fluor-richterite amphibole to confirm its validity on fibers with higher compositional variability.
2008
SEM-EDX micro-analysis; quantitative chemical analyses; EDS standardization; fibrous amphiboles.
01 Pubblicazione su rivista::01a Articolo in rivista
A microanalytical SEM-EDS method applied to the quantitative chemical compositions of fibrous amphiboles / Paoletti, L; Bruni, B. M.; Arrizza, L; S., Tagliani; Pacella, Alessandro; Gianfagna, Antonio. - In: PERIODICO DI MINERALOGIA. - ISSN 0369-8963. - STAMPA. - 77:(2008), pp. 63-73. [10.2451/2008PM0014]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/364978
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