Standard Active Last Updated: Jul 31, 2019
ASTM C799-19

Standard Test Methods for Chemical, Mass Spectrometric, Spectrochemical, Nuclear, and Radiochemical Analysis of Nuclear-Grade Uranyl Nitrate Solutions

Standard Test Methods for Chemical, Mass Spectrometric, Spectrochemical, Nuclear, and Radiochemical Analysis of Nuclear-Grade Uranyl Nitrate Solutions
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Significance and Use

4.1 Uranyl nitrate solution is used as a feed material for conversion to the hexafluoride as well as for direct conversion to the oxide. In order to be suitable for this purpose, the material must meet certain criteria for uranium content, isotopic composition, acidity, radioactivity, and impurity content. These methods are designed to show whether a given material meets the specifications for these items described in Specification C788.

4.1.1 An assay is performed to determine whether the material has the specified uranium content.

4.1.2 Determination of the isotopic content of the uranium is made to establish whether the effective fissile content is in accordance with the purchaser’s specifications.

4.1.3 Acidity, organic content, and alpha, beta, and gamma activity are measured to establish that they do not exceed their maximum limits.

4.1.4 Impurity content is determined to ensure that the maximum concentration limit of certain impurity elements is not exceeded. Impurity concentrations are also required for calculation of the equivalent boron content (EBC), and the total equivalent boron content (TEBC).


1.1 These test methods cover procedures for the chemical, mass spectrometric, spectrochemical, nuclear, and radiochemical analysis of nuclear-grade uranyl nitrate solution to determine compliance with specifications.

1.2 The analytical procedures appear in the following order:



Determination of Uranium


Specific Gravity by Pycnometry

16 – 21

Free Acid by Oxalate Complexation

22 – 28

Determination of Thorium


Determination of Chromium


Determination of Molybdenum


Halogens Separation by Steam Distillation

32 – 36

Fluoride by Specific Ion Electrode

37 – 43

Halogen Distillate Analysis: Chloride, Bromide, and Iodide by
  Amperometric Microtitrimetry


Determination of Chloride and Bromide


Determination of Sulfur by X-Ray Fluorescence


Sulfate Sulfur by (Photometric) Turbidimetry


Phosphorus by the Molybdenum Blue (Photometric) Method

55 – 62

Silicon by the Molybdenum Blue (Photometric) Method

63 – 70

Carbon by Persulfate Oxidation-Acid Titrimetry


Conversion to U3O8

72 – 75

Boron by Emission Spectrography


Impurity Elements by Spark Source Mass Spectrography


Isotopic Composition by Thermal Ionization Mass Spectrometry


Uranium-232 by Alpha Spectrometry

79 – 85

Total Alpha Activity by Direct Alpha Counting

86 – 92

Fission Product Activity by Beta Counting

93 – 99

Entrained Organic Matter by Infrared Spectrophotometry


Fission Product Activity by Gamma Counting


Determination of Arsenic


Determination of Impurities for the EBC Calculation


Determination of Technetium 99


Determination of Plutonium and Neptunium


1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

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. Specific precautionary statements are given in Section 6.

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.

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Book of Standards Volume: 12.01
Developed by Subcommittee: C26.05
Pages: 14
DOI: 10.1520/C0799-19
ICS Code: 27.120.30