1.1 本试验方法描述了硝酸盐和氯化物溶液中钚（III）总量的测定。该技术适用于由二氧化钚粉末和颗粒产生的溶液（试验方法 C697 )，核级混合氧化物（试验方法 C698型 )，金属钚（试验方法 C758 )和硝酸钚溶液（试验方法 C759 ). 使用实践中描述的适当溶解技术溶解固体样品 C1168 . 已报告将该技术用于其他含钚材料 ( 1- 6. ) , 2. 但适用性的最终确定必须由用户进行。钚样品溶液的适用浓度范围为10至200 g Pu/L。 注1: 如在分光光度计中直接测量，浓度约为0。 8至4.0 g Pu/L。稀释样品溶液以达到该目标范围。对于固体样品，选择样品大小和溶解溶液重量，以获得10至30 g Pu/L范围内的样品溶液。通过特殊的制备和光谱分析技术，该方法已应用于0.1至10 g Pu/L范围内的硝酸盐溶液。 1.2 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。 1.3 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。 1.4 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 本试验方法旨在确定给定材料是否符合买方的钚含量规范。该方法也可用于与核材料加工相关的过程控制或责任测量，并具有足够的资格。

1.1 This test method describes the determination of total plutonium as plutonium(III) in nitrate and chloride solutions. The technique is applicable to solutions resulting from plutonium dioxide powders and pellets (Test Methods C697 ), nuclear grade mixed oxides (Test Methods C698 ), plutonium metal (Test Methods C758 ), and plutonium nitrate solutions (Test Methods C759 ). Solid samples are dissolved using the appropriate dissolution techniques described in Practice C1168 . The use of this technique for other plutonium-bearing materials has been reported ( 1- 6 ) , 2 but final determination of applicability must be made by the user. The applicable concentration range for plutonium sample solutions is 10 to 200 g Pu/L. Note 1: As directly measured in the spectrophotometer, concentrations will be approximately 0.8 to 4.0 g Pu/L. Sample solutions are diluted to reach this target range. For solid samples, select the sample size and dissolved solution weight to yield sample solutions in the 10 to 30 g Pu/L range. With special preparation and spectral analysis techniques, the method has been applied to nitrate solutions in the 0.1 to 10 g Pu/L range. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. 1.4 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 designed to determine whether a given material meets the purchaser's specification for plutonium content. This method may also be used, with sufficient qualification, for process control or accountability measurements associated with nuclear materials processing.