1.1 本试验方法描述了用直流电弧发射光谱法制备和测定金属铀和铀化合物中杂质金属所必需的步骤。 1.2 该方法适用于那些可溶于酸或在马弗炉中转化为氧化物或两者兼而有之的材料（参见实践 C1347 ). 1.3 该方法使用载体蒸馏技术将杂质选择性地携带到电弧中，将氧化铀留在电极中。如果需要将载体金属（通常是银或锶或镓化合物）测定为杂质，则必须为该元素选择另一种技术。 1.4 单位- 以SI单位表示的值将被视为标准值。括号中给出的值仅供参考。 1.5 本标准可能涉及危险材料、操作和设备。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。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《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 本试验方法适用于金属铀、铀氧化物和溶于硝酸或硫酸的化合物以及可转化为铀氧化物的铀溶液 3 O 8 ）在马弗炉中。它可用于测定质量标准中列出的铀化合物中的杂质 C753 , C776 , C788 ，和 C967 .

1.1 This test method describes the steps necessary for the preparation and determination of impurity metals in uranium metal and uranium compounds by DC arc emission spectroscopy. 1.2 The method is valid for those materials that can be dissolved in acid or converted to an oxide in a muffle furnace, or both (see Practice C1347 ). 1.3 This method uses the carrier distillation technique to selectively carry the impurities into the arc, leaving the uranium oxide in the electrode. If it is necessary to determine the carrier metal (usually a silver or strontium, or gallium compound) as an impurity, another technique must be chosen for that element. 1.4 Units— The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.5 This standard may involve hazardous materials, operations, and equipment. 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. 1.6 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 This test method is applicable to uranium metal, uranium oxides and compounds soluble in nitric or sulfuric acid, and uranium solutions which can be converted to uranium oxide (U 3 O 8 ) in a muffle furnace. It may be used to determine the impurities in uranium compounds as listed in Specifications C753 , C776 , C788 , and C967 .