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Related Experiment Videos

Calibration standards for counting asbestos.

L W Ortiz, H J Ettinger, C I Fairchild

    American Industrial Hygiene Association Journal
    |February 1, 1975
    PubMed
    Summary
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    A new method standardizes asbestos counting by creating consistent filter samples. This technique ensures reproducible asbestos standards for laboratory proficiency testing, improving accuracy in fiber analysis.

    Area of Science:

    • Occupational Health
    • Environmental Science
    • Analytical Chemistry

    Background:

    • Standardization of asbestos counting is crucial for regulatory compliance and accurate exposure assessment.
    • Existing methods for preparing asbestos samples lack consistency, leading to variations in laboratory results.
    • The National Institute for Occupational Safety and Health (NIOSH) initiated a program to address these standardization challenges.

    Purpose of the Study:

    • To develop and describe a technique for preparing standardized asbestos filter samples.
    • To establish reproducible asbestos standards for laboratory proficiency testing.
    • To evaluate the variability in sample preparation and inter-counter differences in asbestos fiber counting.

    Main Methods:

    • Development of a liquid suspension filtration technique using toluene.

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  • Preparation of chrysotile asbestos standards with concentrations ranging from 200 to 1,500 fibers/mm-2.
  • Inclusion of an aluminum oxide particulate background for realistic sample simulation.
  • Extensive replicate fiber counting by multiple counters to assess variability.

    • Main Results:

    • The liquid suspension filtration technique yields reproducible asbestos standards.
    • Optical microscopy measurements showed a coefficient of variation of ±20% for the prepared standards.
    • Maximum individual variations in fiber counts were observed to be ±50%.

    Conclusions:

    • The described filtration technique effectively produces consistent and predictable asbestos standards.
    • This method supports the NIOSH goal of standardizing asbestos counting procedures across state agencies.
    • The technique provides a reliable basis for laboratory proficiency testing in asbestos analysis.