長繊維セピオライト中のトレモライトのX線回折法による定量方法

概要

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In recent ban of use of asbestos product in Japan, sepiolite has been attracted as an asbestos substitute. Sepiolite from China consisting of long fibers has been used as an asbestos substitute, but the recent high production and onsumption causes of poor sepiolite materials containing small amount of tremolite asbestos as an impurity. For the safety use of Chinese sepiolite, precise analysis of contaminated tremolite and product management are quite important. This study determined how to detect and quantify the contaminated tremolite precisely. For the quantitative analysis, we prepared standard sepiolite samples containing known amounts of tremolite using fibrous tremolite sample produced from Yamaga, Kumamoto Prefecture and pure sepiolite sample from Hebei, China. For the preparation, various methods for equally mixing of tremolite in sepiolite matrix were studied. A conventional X-ray diffractmeter was employed for the analysis of contaminated tremolite for routinely quality control. A calibration curve was prepared for the quantitative analysis. This method showed the detection lower limit of 0.5% tremolite in sepiolite. Using the prepared calibration curve, we analyzed some sepiolite products, and revealed that dispersion of sepiolite product in isopropyl alcohol makes the variance of measured values small and enhance reliability of quantitative analysis.
2004-05-26