环境空气 - 石棉纤维的测定 - 间接转移透射电子显微镜法

[中文适用范围]： 本文件规定了一种使用透射电子显微镜的参考方法，用于测定各种环境空气情况（包括建筑物的内部大气）中空气中的石棉纤维和结构，以及对任何大气中的石棉结构进行详细评估。 样品制备过程包括灰化和分散收集的颗粒，以便测量所有石棉，包括最初掺入颗粒聚集体或复合材料颗粒中的石棉。 测量石棉纤维和石棉束的长度、宽度和长径比，再加上石棉类型的密度，还可以计算出空气中石棉的总质量浓度。 该方法可以确定存在的石棉纤维的类型。 该方法无法区分石棉的单个纤维和细长碎片（裂解碎片和针状颗粒）与相同角闪石矿物的非石棉类似物[12]。 [外文原描述]： This document specifies a reference method using transmission electron microscopy for the determination of airborne asbestos fibres and structures in in a wide range of ambient air situations, including the interior atmospheres of buildings, and for a detailed evaluation for asbestos structures in any atmosphere. The specimen preparation procedure incorporates ashing and dispersion of the collected particulate, so that all asbestos is measured, including the asbestos originally incorporated in particle aggregates or particles of composite materials. The lengths, widths and aspect ratios of the asbestos fibres and bundles are measured, and these, together with the density of the type of asbestos, also allow the total mass concentration of airborne asbestos to be calculated. The method allows determination of the type(s) of asbestos fibres present. The method cannot discriminate between individual fibres of the asbestos and elongate fragments (cleavage fragments and acicular particles) from non-asbestos analogues of the same amphibole mineral [12] .