GB/T 35097-2018 Microbeam analysis—Scanning electron microscopy with energy dispersive X-ray spectrosmetry—Determination of numberical concentration of inorganic fibrous particles in ambient air

Scope

This standard specifies a method for measuring the concentration of inorganic fibrous particles such as asbestos in ambient air using a scanning electron microscope (SEM). This method simultaneously utilizes X-ray energy-dispersive spectroscopy (EDX) to analyze the elemental composition of the fibrous particles and, based on this data, distinguishes between asbestos fibers, calcium sulfate fibers, and other inorganic fibers. This standard is applicable to the determination of the concentration of inorganic fibrous particles such as asbestos in ambient air, as well as the detection of the concentration of such particles in indoor air of buildings. For example, after the removal and replacement of asbestos-containing building materials, the determination of the residual concentration of asbestos fibers in the air is performed. If no fibers are detected during the test (the number of fibers is 0), the upper limit of the 95% confidence interval is 2.99 fibers. If 1.0 m3 of air passes through a 1 cm2 sample membrane, and the SEM analysis is conducted on a 1 mm2 area of this membrane, the detection limit is approximately 300 fibers/m3 when the air volume passing through the analyzed area of the membrane is 0.010 m3. The concentration of fibrous particles on the filter membrane sample ranges from approximately 3 fibers/cm2 to 200 fibers/cm2. The concentration value (number of fibers/m3) in the air depends on the sampling volume and can be calculated. Note

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