The Stage Constants of Cascade Impactors

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Abstract
The particle size distributions which would be found on each stage of a cascade impactor when used to sample an aerosol having a lognormal mass distribution have been calculated. Three impactors, differing with respect to the collection characteristics of the various stages, were assumed. Samples were obtained from hypothetical aerosols having a wide range of distribution parameters. It is shown that for a particular aerosol the particle sizes appear to be lognormally distributed on all stages and that the mass median diameter for a given stage, calculated from the number distribution on that stage, is a good estimate of the true mass median diameter for that stage. The true mass median diameters and true effective cut-off diameters for each stage and for each aerosol have been calculated also. The latter are shown to be superior for interpreting impactor data.

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