What is ISO 14966 - SEM for inorganic fibrous particles about?
ISO 14966 specifies a method using scanning electron microscopy (SEM) for the determination of the concentration of inorganic fibrous particles in the air. ISO 14966 provides a method that specifies the use of gold-coated, capillary-pore, track-etched membrane filters, through which a known volume of air has been drawn. Using energy-dispersive X-ray analysis (EDXA), the method can discriminate between fibres with compositions consistent with those of the asbestos varieties (e.g., serpentine and amphibole), gypsum, and other inorganic fibres. ISO 14966 provides a summary of fibre types that can be measured.
ISO 14966 is applicable to the measurement of the concentrations of inorganic fibrous particles in ambient air. ISO 14966 provides a method that is applicable for determining the numerical concentrations of inorganic fibrous particles in the interior atmospheres of buildings, for example, to determine the concentration of airborne inorganic fibrous particles remaining after the removal of asbestos-containing products. The ability of the method to detect and classify fibres with widths lower than 0,2 μm is limited. If airborne fibres in the atmosphere being sampled are predominantly <0,2 μm in width, a transmission electron microscopy method such as ISO 10312[8] is used to determine the smaller fibres.
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