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/cm2 with sprayed asbestos and<0.5mg/cm2 with the asbestos boards. The variation coefficient of the analytical data was approximately 8% and the detection limit 0.8%.
Concerning the method for determining lead in biological materials, especially blood and urine, a comparison was made between the dithizone-polarography, flame- and flameless atomic absorption spectrophotometry and anodic stripping voltammetry based on the present authors' experiences. The outline of each method with the points to be considered was described.