Abstract
Talc aerosol particles found in work environments have plate-like shapes. These particles are difficult to characterise by their physical dimension or their aerodynamic behaviour. This paper describes a detailed study to measure the physical and aerodynamic properties of a respirable talc aerosol of commercial grade and establish a relationship between the projected area diameter (Dp) and the aerodynamic diameter (Dar). The bulk density was measured to be 3.04 g/cm3. Electronmicrographs showed that the particles were plate-like with a constant thickness-to-diameter ratio of 0.086. The aerosol was aerodynamically separated in an aerosol centrifuge and was collected flat on the substrate. The dynamic shape factor of the size-classified talc particle was calculated to be 2.01, which is in good agreement with the theory based on an oblate spheroid moving with its short axis parallel to the flow. The aerodynamic resistance diameter was linearly related to the project area diameter by the relationship Dar = 0.62 Dp √C(Dv).
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