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Proposed international conventions for particle size-selective sampling.

S C Soderholm

    The Annals of Occupational Hygiene
    |January 1, 1989
    PubMed
    Summary

    New definitions for airborne particle fractions (inspirable, thoracic, respirable) are proposed to standardize sampling methods. These definitions, based on particle aerodynamic diameter, aim to reduce confusion among standard-setting organizations.

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    Area of Science:

    • Environmental Health Sciences
    • Occupational Hygiene
    • Aerosol Science

    Background:

    • Particle size-selective sampling is crucial for accurately assessing airborne contaminant exposure.
    • Existing definitions for inspirable, thoracic, and respirable fractions lack international harmonization.
    • Discrepancies between established BMRC and ACGIH definitions for the respirable fraction cause confusion.

    Purpose of the Study:

    • To propose standardized definitions for inspirable, thoracic, and respirable fractions of airborne particles.
    • To provide mathematical functions for sampling efficiencies based on particle aerodynamic diameter.
    • To facilitate international harmonization of particle sampling conventions.

    Main Methods:

    • Development of mathematical models for sampling efficiency (S) as a function of particle aerodynamic diameter (d).
    • Formulation of definitions for inspirable (SI(d)), thoracic (ST(d)), and respirable (SR(d)) fractions.
    • Comparison of proposed definitions with existing BMRC and ACGIH standards using human data.

    Main Results:

    • Proposed definitions for SI(d), ST(d), and SR(d) are presented.
    • The proposed respirable fraction definition differs from BMRC and ACGIH, showing comparable defensibility with human data.
    • The proposed definitions offer a path towards international standardization.

    Conclusions:

    • The proposed definitions for airborne particle fractions provide a basis for international harmonization.
    • Adoption of these standardized specifications will minimize confusion in particle size-selective sampling.
    • Standardization is essential as multiple organizations are adopting particle size-selective sampling conventions.

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