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Related Experiment Videos

Particle bounce in a personal cascade impactor: a field evaluation.

W C Hinds, W C Liu, J R Froines

    American Industrial Hygiene Association Journal
    |September 1, 1985
    PubMed
    Summary

    Particle bounce in personal cascade impactors depends on substrate material and aerosol type. Field evaluations are crucial for selecting appropriate collection surfaces to accurately measure particle size distributions.

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    Area of Science:

    • Environmental Science
    • Analytical Chemistry
    • Occupational Health

    Background:

    • Personal cascade impactors are vital for assessing airborne particle size distributions.
    • Particle bounce from collection substrates can significantly alter measured mass median diameter (MMD).
    • Understanding substrate collection characteristics is essential for accurate aerosol sampling.

    Purpose of the Study:

    • To evaluate particle bounce on five different substrate types used in personal cascade impactors.
    • To compare the performance of coated and uncoated substrates with various dusts and fumes.
    • To determine the influence of substrate material on measured particle size.

    Main Methods:

    • Laboratory and field experiments were conducted using lead dioxide dust, brass pouring fume, and brass grinding dust.
    • Five substrates were tested: uncoated stainless steel, silicon grease-coated stainless steel, oil-saturated Millipore, oil-saturated Teflon, and oil-saturated sintered stainless steel.
    • Mass median diameter (MMD) was measured for each substrate-aerosol combination.

    Main Results:

    • Uncoated stainless steel showed a 50% decrease in measured MMD for brass grinding dust compared to coated stainless steel.
    • Oil-saturated Millipore membrane consistently yielded lower MMDs than coated stainless steel.
    • Coated and uncoated stainless steel showed similar MMDs for brass pouring fume, while Teflon and sintered metal matched grease-coated stainless steel.

    Conclusions:

    • Particle bounce is highly dependent on the specific aerosol material being sampled.
    • The effectiveness of collection surfaces varies significantly with the type of dust or fume.
    • Field evaluation is necessary to determine the suitability of collection surfaces for accurate aerosol characterization.

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