Standard Active Last Updated: Oct 11, 2018
ASTM C758-18

Standard Test Methods for Chemical, Mass Spectrometric, Spectrochemical, Nuclear, and Radiochemical Analysis of Nuclear-Grade Plutonium Metal

Significance and Use

4.1 These test methods are designed to show whether a given material meets the purchaser's specifications.

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

4.1.2 Determination of the isotopic content of the plutonium is made to establish whether the effective fissile content is in compliance with the purchaser's specifications.

4.1.3 Impurity content is verified by a variety of methods to ensure that the maximum concentration limit of specified impurities is not exceeded. Determination of impurities is also required for calculation of the equivalent boron content (EBC).

4.2 Fitness for Purpose of Safeguards and Nuclear Safety Applications—Methods intended for use in safeguards and nuclear safety applications shall meet the requirements specified by Guide C1068 for use in such applications.


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

1.2 The analytical procedures appear in the following order:



Dissolution Procedure


Plutonium by Controlled-Potential Coulometry


Plutonium by Amperometric Titration with Iron (II)


Plutonium by Ceric Sulfate Titration Test Method


Plutonium by Diode Array Spectrophotometry


Uranium by Arsenazo I Spectrophotometric Test Method

8 – 10

Thorium by Thorin Spectrophotometric Test Method

11 – 13

Iron by 1,10-Phenanthroline Spectrophotometric Test Method

14 – 16

Iron by 2,2ʹ-Bipyridyl Spectrophotometric Test Method

17 – 23

Impurities by ICP-AES


Chloride by the Thiocyanate Spectrophotometric Test Method

24 – 26

Fluoride by Distillation-Spectrophotometric Test Method


Nitrogen by Distillation-Nessler Reagent Spectrophotometric Test


Carbon by the Direct Combustion-Thermal Conductivity Test

31 – 33

Sulfur by Distillation-Spectrophotometric Test Method

34 – 36

Isotopic Composition by Mass Spectrometry

37 and 38

Plutonium-238 Isotopic Abundance by Alpha Spectrometry


Americium-241 by Extraction and Gamma Counting

39 – 41

Americium-241 by Gamma Counting


Gamma-Emitting Fission Products, Uranium, and Thorium by
 Gamma-Ray Spectroscopy

42 – 49

Rare Earths by Copper Spark Spectrochemical Test Method

50 – 52

Tungsten, Niobium (Columbium), and Tantalum by Spectro-
 chemical Test Method

53 – 55

Sample Preparation for Spectrographic Analysis for Trace Impuri-

56 – 60

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. For specific safeguard and safety hazards statements, see 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: 9
DOI: 10.1520/C0758-18
ICS Code: 27.120.30