1.1 这些试验方法涵盖了核级碳化硼粉末和芯块的化学、质谱和光谱化学分析程序，以确定是否符合规范。 1.2 以国际单位制表示的值应被视为标准。括号中给出的值仅供参考。 1.3 分析程序按以下顺序出现: 小节 感应炉燃烧产生的总碳 红外测量 8 – 17 滴定法和ICP法测定总硼- OES 18 – 28 质谱法测定同位素组成 29 – 33 高温水解 34 – 41 恒流库仑法测定氯化物 42 – 50 离子选择电极测定氯化物和氟化物 51 – 59 恒压库仑法测定水及其失重 干燥 60 – 63 DCArc OES和湿化学法测定金属杂质 64和 65 滴定法和ICP-OES法测定可溶性硼 66 – 80 库仑法测定游离碳 81 – 90 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。 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，并确定监管限制的适用性。 1.5 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====== 4.1 碳化硼被用作核反应堆的控制材料。为了适用于此目的，材料必须符合某些化验标准、同位素组成和杂质含量。这些方法旨在显示给定材料是否符合规范中所述的这些项目的规范 C750 和 C751 . 4.1.1 进行分析以确定材料是否具有指定的硼和碳含量。 4.1.2 测定硼的同位素含量和游离碳含量，以确定含量是否符合买方的规范。 4.1.3 确定杂质含量以确保不超过某些杂质（氯化物、氟化物、水、金属杂质、可溶性硼）的最大含量限制。

1.1 These test methods cover procedures for the chemical, mass spectrometric, and spectrochemical analysis of nuclear-grade boron carbide powder and pellets to determine compliance with specifications. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 The analytical procedures appear in the following order: Sections Total Carbon by Combustion in an Inductive Furnace and Infrared Measurement 8 – 17 Total Boron by Titrimetry and ICP-OES 18 – 28 Isotopic Composition by Mass Spectrometry 29 – 33 Pyrohydrolysis 34 – 41 Chloride by Constant-Current Coulometry 42 – 50 Chloride and Fluoride by Ion-Selective Electrode 51 – 59 Water by Constant-Voltage Coulometry and Weight Loss on Drying 60 – 63 Metallic Impurities by DCArc-OES and wet chemical methods 64 and 65 Soluble Boron by Titrimetry and ICP-OES 66 – 80 Free Carbon by a Coulometric Method 81 – 90 1.4 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. 1.5 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 ====== 4.1 Boron carbide is used as a control material in nuclear reactors. In order to be suitable for this purpose, the material must meet certain criteria for assay, isotopic composition, and impurity content. These methods are designed to show whether or not a given material meets the specifications for these items as described in Specifications C750 and C751 . 4.1.1 An assay is performed to determine whether the material has the specified boron and carbon content. 4.1.2 Determination of the isotopic content of the boron and the free carbon content is made to establish whether the content is in compliance with the purchaser’s specifications. 4.1.3 Impurity content is determined to ensure that the maximum content limit of certain impurities (chloride, fluoride, water, metallic impurities, soluble boron) is not exceeded.