Abstract
The paper describes a new method of determining quartz in respirable dust based on the electric polarization of the quartz lattice under mechanical pressure. The piezoelectricity of the sample surface is measured, after elimination of the triboelectric charges, by means of a charge amplifier (a differentiating circuit composed of two field-effect transistors), through a layer of inert dust with high resistivity; charge-time curves are obtained which are a function of the percentage of quartz particles present on the surface of the sample.
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