1.1 本试验方法规定了工作场所空气样品中六价铬时间加权平均质量浓度的测定方法。 1.2 本试验方法适用于ISO 7708中定义的空气颗粒可吸入部分的个人采样和区域（静态）采样。 1.3 样品溶出程序规定了可溶性和不溶性六价铬的单独程序。 1.4 本试验方法适用于测定质量为0.01 μ g至10 μ g的六价铬/样品，无需稀释。 1.5 该程序适用的空气中六价铬的浓度范围约为0.1 μ g/m 3 100微克/米 3 ，假设1 m 3 空气样本。该范围可以通过适当稀释而向上延伸。1.6 在取样和样品制备过程中可能发生三价和六价铬物质的相互转化，但是通过所采用的取样和样品制备程序尽可能地将这些过程最小化。 1.7 以SI单位表示的值将被视为标准值。本标准不包括其他计量单位。 1.8 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.9 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》中确立的国际公认的标准化原则制定的。======意义和用途====== 5.1 空气中六价铬致癌 ( 1- 3 ) , 4 并且需要用于测量工作场所气溶胶中该物质的分析方法。工人接触六价铬主要通过吸入发生 ( 1- 3 ) 该测试方法提供了一种对这种高毒性物种的暴露评估方法。该程序的分析结果可用于法规遵从性目的 ( 4 ) .

1.1 This test method specifies a method for the determination of the time-weighted average mass concentration of hexavalent chromium in workplace air samples. 1.2 This test method is applicable to the personal sampling of the inhalable fraction of airborne particles, as defined in ISO 7708, and to area (static) sampling. 1.3 The sample dissolution procedure specifies separate procedures for soluble and insoluble hexavalent chromium. 1.4 This test method is applicable to the determination of masses of 0.01 μg to 10 μg of hexavalent chromium per sample without dilution. 1.5 The concentration range for hexavalent chromium in air for which this procedure is applicable is approximately 0.1 μg/m 3 to 100 μg/m 3 , assuming 1 m 3 of air sample. The range can be extended upwards by appropriate dilution. 1.6 Interconversion of trivalent and hexavalent chromium species may occur during sampling and sample preparation, but these processes are minimized to the extent possible by the sampling and sample preparation procedures employed. 1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.8 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. 1.9 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 Airborne hexavalent chromium is carcinogenic ( 1- 3 ) , 4 and analytical methods for the measurement of this species in workplace aerosols are desired. Worker exposure to hexavalent chromium occurs primarily through inhalation ( 1- 3 ) , and this test method provides a means for exposure assessment to this highly toxic species. Analytical results from this procedure can be used for regulatory compliance purposes ( 4 ) .