ASTM C1022-2017 铀精矿化学分析和原子吸收分析的试验方法 Standard Test Methods for Chemical and Atomic Absorption Analysis of Uranium-Ore Concentrate

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 CO2 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.