A procedure is reported for separating the minus-10-micron fractions of industrial dusts so that the chemical and physical natures of the components of these respirable fractions can be characterized. The procedure has been applied to bulk asbestos samples, and a comparison of the metallic compositions of the bulk, the plus-10-, and the minus-10-micron fractions is presented.
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Kupel et al. (1968) studied this question.
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