ASTM C 698:2024

1.1 These test methods cover procedures for the chemical, mass spectrometric, and spectrochemical analysis of nuclear-grade mixed oxides, (U, Pu)O₂ , powders and pellets to determine compliance with specifications. 1.2 The analytical procedures appear in the following order: Sections Uranium in the Presence of Pu by Potentiometric Titration 2 Plutonium by Controlled-Potential Coulometry 2 Plutonium by Amperometric Titration with Iron (II) 2 Nitrogen by Distillation Spectrophotometry Using Nessler Reagent 8 to 15 Carbon (Total) by Direct Combustion-Thermal Conductivity 16 to 26 Total Chlorine and Fluorine by Pyrohydrolysis 27 to 34 Sulfur by Distillation-Spectrophotometry 35 to 43 Moisture by the Coulometric, Electrolytic Moisture Analyzer 44 to 51 Isotopic Composition by Mass Spectrometry 3 Rare Earths by Copper Spark Spectroscopy 4 Trace Impurities by Carrier Distillation Spectroscopy 4 Impurities by Spark-Source Mass Spectrography 4 Total Gas in Reactor-Grade Mixed Dioxide Pellets 5 Tungsten by Dithiol-Spectrophotometry 52 to 60 Rare Earth Elements by Spectroscopy 4 Plutonium-238 Isotopic Abundance by Alpha Spectrometry 6 Americium-241 in Plutonium by Gamma-Ray Spectrometry Uranium and Plutonium Isotopic Analysis by Mass Spectrometry 61 to 69 Oxygen-to-Metal Atom Ratio by Gravimetry 70 to 77 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. (For specific safety precaution statements, see Sections 6 , 13.2.5 , 41.7 , and 65.6.1 .) 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.

27.120.30