ASTM C698-98

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 by Controlled-Potential Coulometry 2 Plutonium by Controlled-Potential Coulometry 2 Plutonium by Amperometric Titration with Iron (II) 2 Nitrogen by Distillation Spectrophotometry Using Nessler Reagent 34 to 41 Carbon (Total) by Direct Combustion-Thermal Conductivity 42 to 53 Total Chlorine and Fluorine by Pyrohydrolysis 54 to 61 Sulfur by Distillation-Spectrophotometry 62 to 70 Moisture by the Coulometric, Electrolytic Moisture Analyzer 71 to 78 Isotopic Composition by Mass Spectrometry 3 Rare Earths by Copper Spark Spectroscopy 87 to 94 Trace Impurities by Carrier Distillation Spectroscopy 95 to 104 Impurities by Spark-Source Mass Spectrography 105 to 111 Total Gas in Reactor-Grade Mixed Dioxide Pellets 112 to 119 Tungsten by Dithio Spectrophotometry 120 to 128 Rare Earth Elements by Spectroscopy 129 to 132 Plutonium-238 Isotopic Abundance by Alpha Spectrometry 133 to 140 Uranium and Plutonium Isotopic Analysis by Mass Spectrometry 141 to 149 Oxygen-to-Metal Atom Ratio by Gravimetry 150 to 158

1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. (For specific safeguard and safety precaution statements, see Sections 38, 47, 99, and 155 and 145.6.1.)