Quantitative analysis of asbestos in bulk samples (sprayed asbestos and asbestos boards) was attempted by X-ray diffraction using the suspension.
Experiments were made on the selection of filters, time of ultrasonic dispersion and absorption effects of matrix materials. Calibrating standards and sample specimens were prepared by filtering suspennsions dispersed ultrasonically through a nitrocellulose (membrane) filter.
Absorption effects were negligible when the materials on the filter were in the range<1mg/cm
2 with sprayed asbestos and<0.5mg/cm
2 with the asbestos boards. The variation coefficient of the analytical data was approximately 8% and the detection limit 0.8%.
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