空气质量 散装材料 第2部分：通过重量法和显微镜法定量测定石棉

[中文适用范围]： 本文件规定了石棉质量分数低于约5%的定量程序，以及蛭石、其他工业矿物和含有这些矿物的商业产品中石棉的定量测定方法。本文件适用于以下材料的定量分析：a) 使用ISO 22262-1获得的石棉质量分数估计值被认为精度不足以可靠分类材料监管状态（即该材料在特定司法管辖区是否受石棉法规约束）的材料，或认为有必要获得进一步证据证明不含石棉的材料；b) 弹性地板砖、沥青材料、屋面油毡以及任何其他石棉嵌入有机基体中的材料；c) 带或不带骨料的墙壁和天花板抹灰；d) 蛭石及含有蛭石的商业产品；e) 滑石、硅灰石、海泡石、凹凸棒石（坡缕石）、方解石或白云石等矿物粉末，以及含有这些矿物的商业产品。本文件主要适用于通过样品质量估计石棉质量分数低于约5%的样品。本文件也适用于可能含有低质量分数石棉且嵌入基体材料中的样品，使得对未处理样品的显微镜检查不可能或不可靠。 [外文原描述]： This document specifies procedures for quantification of asbestos mass fractions below approximately 5 %, and for quantitative determination of asbestos in vermiculite, other industrial minerals and commercial products that incorporate these minerals. This document is applicable to the quantitative analysis of: a) any material for which the estimate of asbestos mass fraction obtained using ISO 22262-1 is deemed to be of insufficient precision to reliably classify the regulatory status of the material (i.e. whether the material is subject to asbestos regulations in the particular jurisdiction) or for which it is considered necessary to obtain further evidence to demonstrate the absence of asbestos; b) resilient floor tiles, asphaltic materials, roofing felts and any other materials in which asbestos is embedded in an organic matrix; c) wall and ceiling plasters, with or without aggregate; d) vermiculite and commercial products containing vermiculite; e) mineral powders such as talc, wollastonite, sepiolite, attapulgite (palygorskite), calcite or dolomite, and commercial products containing these minerals. This document primarily applies to samples in which asbestos has been identified at estimated mass fractions lower than approximately 5 % by sample mass. This document is also applicable to samples that can contain asbestos at low mass fractions incorporated into matrix material such that microscopical examination of the untreated sample is either not possible or unreliable.