Estimation of Purity of Chrysotile Asbestos by X-ray Diffractometry/Rietveld Refinement

Asahi, Tomoharu; Matsudaira, Takaomi; Kobayashi, Shinji; Nakayama, Kenichi; Nakamura, Toshihiro

doi:10.2116/analsci.26.1295

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…The internal standard needs to have a well-known amorphous content and the particle size should be similar to that of the sample. The mass attenuation coefficient should also be a factor in the choice of an internal standard; it should be as close as possible to that of the analyte (Asahi et al , 2010). In our study, as quartz is the compound of interest ( μ = 34.84 cm 2 g −1 for Cu Kα ), corundum was the first choice because its mass absorption factor is really close to that of quartz.…”

Section: Methodsmentioning

confidence: 99%

Development of a quantification method for quartz in various bulk materials by X-ray diffraction and the Rietveld method

et al. 2012

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Crystalline silica is known for its health hazards, and since 1997 has been listed as Group 1, Carcinogenic to Humans, by the International Agency for Research on Cancer. This issue is particularly important in the industrial environment, and there is still no method that allows quantification of the different polymorphs of crystalline silica. Many analytical methods have been proposed, and the major problem in almost all cases is attributable to the very large variety of matrixes encountered. This study evaluates the potential of X-ray diffraction techniques and an automated Rietveld analysis in order to overcome this problem and to adapt the quantitative analysis of quartz, the most prevalent crystalline silica polymorph, to routine analysis in the health and safety environment. Matrix simulations are done and many parameters are optimized. Sample preparation, the acquisition program, pattern treatment, and Rietveld refinement are evaluated, and a general procedure is determined. Automation of Rietveld refinement leads to a significant reduction in analysis time, but cannot be applied to every type of sample.

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Section: Methodsmentioning

confidence: 99%

Development of a quantification method for quartz in various bulk materials by X-ray diffraction and the Rietveld method

et al. 2012

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“…These results indicate that eskolaite is the most suitable internal standard material for the XRD analysis of sintered ore. Asahi et al 20,21) reported that the mass absorption coefficient of an internal standard should be close to that of the analyte. The mass absorption coefficient of eskolaite (177 cm 2 .…”

Section: Selection Of the Internal Standard Materialsmentioning

confidence: 99%

“…The crystalline purities of all the chemical reagents were determined by powder XRD/Rietveld refinement, and each diffraction intensity was corrected by the crystalline purities according to a previously reported method. 20,21) For example, the crystalline purities were measured as follows: hematite, 98.7%; magnetite, 94.0%; and eskolaite, 92.3%.…”

Section: Reagents For Standardsmentioning

confidence: 99%

Crystalline Phase Quantitation of Sintered Ore with Powder X-ray Diffractometry with Rietveld Refinement

et al. 2016

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X-ray diffractometry (XRD) with Rietveld refinement was applied to the crystalline phase analysis of two certified standard sintered ores (JSS 851-2 and JSS 851-5) and an industrial sintered ore (SO-1). An eskolaite (Cr 2 O 3 ) powder was mixed at 10 mass% with each sintered ore sample as an internal standard to correct for the effect of amorphous phase and unknown crystalline phases. The results of Rietveld refinement for JSS 851-2 were 23.0 mass% hematite, 29.5 mass% magnetite, 39.8 mass% silico ferrites of calcium and aluminum, 5.6 mass% dicalcium silicate, and 2 mass% amorphous phase, and these values are within the range previously reported for its phase composition. The elemental concentrations calculated from the crystalline compositions using Rietveld refinement of the three sintered ore samples were also in good agreement with the certified values and those from X-ray fluorescence analysis. A calibration curve method and a diffraction-absorption method for crystalline phase quantitation were used to validate the results of the powder XRD/Rietveld method, and the three results agreed well. The present method enables reliable determination of not only the major crystalline phases but also the amorphous phase present in the sintered ore.KEY WORDS: sintered ore; X-ray diffractometry; Rietveld refinement; internal standard.

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“…The JAWE-111 chrysotile standard material treated with HCl (crystalline purity: 92.0%) 14 was used as the calibration standard for chrysotile with XRD quantitation. Alumina powder (High Purity Chemicals; particle size, 1 μm) was used as an internal standard for quantitative determination with XRD/Rietveld refinement.…”

Section: Base Materials and Reagentsmentioning

confidence: 99%

“…These standard materials are composed of pure phase of chrysotile, and they are principally used as a calibration standard. The purities of these standard chrysotile were determined only by Asahi et al, 14 using XRD/Rietveld refinement with the internal standard method. There are many studies for the quantitative determination of chrysotile in ACM using the standard materials of UICC or JAWE.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Evaluation of a Chrysotile Asbestos-containing Standard Material for Validating X-Ray Diffractometric Quantitation

et al. 2011

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A standard material containing chrysotile asbestos for the validation of x-ray diffractometric quantitation was developed using an asbestos-containing building material i.e., perlite board. The board as the base material was crushed, pulverized, and homogenized. The homogeneity of the powder of perlite board was estimated by analysis of variance. The diffraction intensity values of the crystalline phases and the concentrations of elements determined by x-ray diffractometry and x-ray fluorescence analysis were used for analysis of variance. There is no significant difference between the within-bottle variance and the between-bottle variance, indicating that the powdered perlite board was sufficiently homogenous. The concentration of chrysotile in the material was determined using two methods: an internal standard/x-ray diffractometry method and the x-ray diffractometry/Rietveld refinement. The concentration of chrysotile in the material was determined by an internal standard/x-ray diffractometry method and the material had a chrysotile concentration of 24.1 ± 0.2 mass%.

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Estimation of Purity of Chrysotile Asbestos by X-ray Diffractometry/Rietveld Refinement

Cited by 5 publications

References 22 publications

Development of a quantification method for quartz in various bulk materials by X-ray diffraction and the Rietveld method

Development of a quantification method for quartz in various bulk materials by X-ray diffraction and the Rietveld method

Crystalline Phase Quantitation of Sintered Ore with Powder X-ray Diffractometry with Rietveld Refinement

Preparation and Evaluation of a Chrysotile Asbestos-containing Standard Material for Validating X-Ray Diffractometric Quantitation

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