1.1 本标准规定了通过红外光谱法测量可吸入结晶二氧化硅的空气颗粒物样品的收集和分析试验方法。 1.2 本试验方法适用于在0.025至0.4 mg/m的工作范围内分析结晶二氧化硅（多晶型石英、方石英和方石英） 3. 对于400 L空气样品或0.02至0.25 mg/m 3. 对于1000 L空气样品，取决于分析方法。 1.3 该方法适用于气载颗粒物可吸入部分的个人采样和静态（区域）采样。 1.4 本试验方法描述了空气中结晶二氧化硅样品的样品制备和红外分析的三种不同程序，如 附件A1– 附件A3 ，分别为:( 1. )溴化钾圆盘红外测量方法( 2. )重新定位到用于测量的过滤器上后的间接红外分析，以及( 3. )直接过滤红外分析。 1.5 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 可吸入结晶二氧化硅对许多行业的工人的健康有害，这些行业的工人因吸入而处于危险之中。工业卫生学家和其他公共卫生专业人员需要确定为控制工人暴露而采取的措施的有效性，这通常通过测量工作场所的空气来实现。发布本标准是为了提供一种在工业中对结晶二氧化硅进行有效曝光测量的方法。这将有利于:关注工作健康和安全的机构；工业卫生学家和其他公共卫生专业人员；分析实验室；含硅产品的工业用户及其工人等。 5.2 本标准规定了使用红外光谱法测量工作场所空气中可吸入结晶二氧化硅质量浓度的通用采样和分析方法。 根据职业卫生采样公约，使用了几种不同类型的采样装置来收集可吸入粉尘。本标准旨在适应各种适当的采样器和商用采样材料。

1.1 This standard specifies a test method for collection and analysis of samples of airborne particulate matter for measurement of respirable crystalline silica by infrared (IR) spectrometry. 1.2 This test method is applicable to the analysis of crystalline silica (the polymorphs quartz, cristobalite and tridymite) over a working range of 0.025 to 0.4 mg/m 3 for a 400 L air sample or 0.02 to 0.25 mg/m 3 for a 1000 L air sample, depending on the analytical method. 1.3 The methodology is applicable to personal sampling of the respirable fraction of airborne particles and to static (area) sampling. 1.4 This test method describes three different procedures for sample preparation and infrared analysis of airborne crystalline silica samples, which are delineated in Annex A1 – Annex A3 , respectively: ( 1 ) a potassium bromide (KBr) disc IR measurement method, ( 2 ) indirect IR analysis after redeposition onto a filter used for measurement, and ( 3 ) direct on-filter IR analysis. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Respirable crystalline silica is a hazard to the health of workers in many industries who are at risk through exposure by inhalation. Industrial hygienists and other public health professionals need to determine the effectiveness of measures taken to control workers’ exposure, and this is generally achieved by taking workplace air measurements. This standard has been published in order to make available a method for making valid exposure measurements for crystalline silica exposures in industry. It will be of benefit to: agencies concerned with health and safety at work; industrial hygienists and other public health professionals; analytical laboratories; industrial users of silica-containing products and their workers, etc. 5.2 This standard specifies a generic sampling and analytical method for measurement of the mass concentration of respirable crystalline silica in workplace air using infrared (IR) spectrometric methods. Several different types of sampling apparatus are used to collect respirable dust, according to the occupational hygiene sampling convention. This standard is designed to accommodate a variety of appropriate samplers and sampling materials that are commercially available.