1.1 这些试验方法包括铀精矿的化学和原子吸收分析程序，以确定是否符合规范中规定的要求 C967 . 1.2 分析程序按以下顺序出现: 小节 硫酸亚铁还原重铬酸钾法生产铀 滴定法 9 硝酸不溶铀 10 到 18 可萃取有机物 19 到 26 砷的测定 27 CO碳酸盐 2. 重量分析法 28 到 34 离子选择电极法测定氟化物 35 到 42 Volhard滴定法测定卤化物 43 到 50 分光光度法测定磷 52 到 60 硅的测定 61 钍的测定 62 钙、铁、镁、钼、钛和钒- 原子吸收分光光度法测定 63 到 72 原子吸收法测定钾和钠 分光光度法 73 到 82 分光光度法测定硼 83 到 92 1.3 以国际单位制表示的数值应视为标准值。括号中给出的值仅供参考。 1.4 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。 第节给出了具体的预防说明 7. . 1.5 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====== 4.1 本标准中的试验方法旨在表明给定材料是否符合规范中规定的规范 C967 . 4.2 由于铀精矿基质的可变性以及适当参考或校准材料的有限可用性，这些测试方法的精度和偏差应由使用它们的每个实验室确定。每种试验方法的精度和偏差声明是由各个实验室报告的，可以用作指南。 4.3 仪器测试方法，如X射线荧光和发射光谱法，可用于测定某些杂质（如有此类设备）。

1.1 These test methods cover procedures for the chemical and atomic absorption analysis of uranium-ore concentrates to determine compliance with the requirements prescribed in Specification C967 . 1.2 The analytical procedures appear in the following order: Sections Uranium by Ferrous Sulfate Reduction—Potassium Dichromate Titrimetry 9 Nitric Acid-Insoluble Uranium 10 to 18 Extractable Organic Material 19 to 26 Determination of Arsenic 27 Carbonate by CO 2 Gravimetry 28 to 34 Fluoride by Ion-Selective Electrode 35 to 42 Halides by Volhard Titration 43 to 50 Phosphorus by Spectrophotometry 52 to 60 Determination of Silicon 61 Determination of Thorium 62 Calcium, Iron, Magnesium, Molybdenum, Titanium, and Vana- dium by Atomic Absorption Spectrophotometry 63 to 72 Potassium and Sodium by Atomic Absorption Spectrophotometry 73 to 82 Boron by Spectrophotometry 83 to 92 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 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. A specific precautionary statement is given in Section 7 . 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 The test methods in this standard are designed to show whether a given material meets the specifications prescribed in Specification C967 . 4.2 Because of the variability of matrices of uranium-ore concentrate and the limited availability of suitable reference or calibration materials, the precision and bias of these test methods should be established by each individual laboratory that will use them. The precision and bias statements given for each test method are those reported by various laboratories and can be used as a guideline. 4.3 Instrumental test methods such as X-ray fluorescence and emission spectroscopy can be used for the determination of some impurities where such equipment is available.