STP1342

    A Validated Method for Gravimetric Determination of Low Concentrations of Asbestos in Bulk Materials

    Published: Jan 1999


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    Abstract

    A method for determination of weight concentrations of asbestos in the 0.01% to 10% range is described. The method is based on gravimetric matrix reduction, incorporating oxidation of organic materials, dissolution of acid-soluble components, and removal of large particle size materials by sedimentation or flotation, followed by analysis of the remaining material using a well-defined point counting procedure optimized for determination of mass concentration. The method has been validated by an inter-laboratory study with the Optical Microscope Laboratory of the Hong Kong Environmental Protection Department using laboratory-prepared standards with known weight concentrations of asbestos ranging from 0.1% to 6% in a wide variety of matrices. The results of analyses by both laboratories exhibit a linear relationship with the known weight concentration of asbestos, with a correlation coefficient of 0.97. The method provides a legally-defensible basis for determining whether the concentration of asbestos measured in a material is lower than or higher than a legislated standard of either 0.1% or 1% asbestos by weight.

    Keywords:

    Asbestos, bulk, analysis, matrix reduction, weight concentration, gravimetric, point counting, legislation, legal, regulation


    Author Information:

    Chatfield, Eric J.
    President, Chatfield Technical Consulting Limited, Mississauga, Ontario


    Paper ID: STP42330S

    Committee/Subcommittee: D22.07

    DOI: 10.1520/STP42330S


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