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Assessment of a modified cascade centripeter

E O Knutson

    American Industrial Hygiene Association Journal
    |March 1, 1980
    PubMed
    Summary

    The modified cascade centripeter offers a practical alternative for urban aerosol sampling, providing detailed particle size data. Its main advantage is obtaining uniform, size-classified deposits on filters for easier analysis.

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    Area of Science:

    • Environmental Science
    • Analytical Chemistry
    • Aerosol Science

    Background:

    • Cascade impactors are widely used for aerosol size classification.
    • Existing devices may have limitations in filter selection and data analysis detail.

    Purpose of the Study:

    • To modify the Hounam and Sherwood cascade centripeter for enhanced filter versatility.
    • To evaluate the modified device's performance for urban aerosol sampling.
    • To develop an improved data analysis method for particle size determination.

    Main Methods:

    • Modification of the cascade centripeter for stages 1-3 filter selection.
    • Calibration testing using monodisperse aerosols against O'Connor's method.
    • Development of an iterative procedure for detailed particle size data analysis.
    • Sampling of urban aerosol using the modified centripeter and selected filters.

    Main Results:

    • The modified cascade centripeter's calibration was validated.
    • The iterative procedure yielded more detailed particle size data compared to conventional methods.
    • The centripeter proved to be a practical alternative to cascade impactors for urban aerosol sampling.
    • Sufficient sample mass for weighing was obtained within 4 to 6 hours using low tare weight filters.

    Conclusions:

    • The modified cascade centripeter is a viable tool for urban aerosol characterization.
    • The device offers advantages in sample collection, yielding uniform deposits on filters.
    • Enhanced data analysis provides more comprehensive particle size information.

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