ASTM C1380-04

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Designation:C1380–04
Standard Test Method for
the Determination of Uranium Content and Isotopic
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Composition by Isotope Dilution Mass Spectrometry
This standard is issued under the fixed designation C1380; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Interferences
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1.1 This test method covers a method for the determination 5.1 The calculations assume any U in the sample is
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of the uranium concentration in uranium oxides by isotope negligible. If the sample contains significant U, the sample
dilution mass spectrometry (IDMS). The isotopic composition must be analyzed for isotopic composition with and without
of the oxide is measured simultaneously. added spike, and the calculations adjusted accordingly.
1.2 This standard does not purport to address all of the
6. Apparatus
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 6.1 Thermal ionization mass spectrometer (TIMS) config-
ured with Faraday cup detectors and an automated operating
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. system.
6.2 Preconditioning unit for the TIMS.
2. Referenced Documents
6.3 Filament loading assembly for the TIMS.
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2.1 ASTM Standards: 6.4 Balance, analytical, with five-place range.
D1193 Specification for Reagent Water 6.5 Vials, glass, disposable with plastic caps.
6.6 Pipet, automatic, Ranin or equivalent, variable to 1000
3. Summary of Test Method
µL.
3.1 For measurement of the elemental uranium concentra- 6.7 Pipet tips, disposable plastic, 100–1000 µL.
tion of uranium oxides by IDMS, a representative and accu-
6.8 Liquid dispenser, Repipettey or equivalent.
rately measured aliquot of the sample is prepared. A known
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7. Reagents and Materials
quantity of U (“spike”) is added to an aliquot of the sample.
The sample aliquot and spike are taken to dryness, redissolved 7.1 Purity of Materials—Reagent grade chemicals shall be
in dilute nitric acid, and loaded on a filament for analysis in a used in all tests. Unless otherwise indicated, it is intended that
thermal ionization mass spectrometer (TIMS). After measure- all reagents conform to the specification of the Committee on
ment of the isotopic ratios in the spiked sample, the uranium Analytical Reagents of the American Chemical Society where
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content and isotopic composition of sample are calculated. such specifications are available. Other grades may be used
provided it is first ascertained that the reagent is of sufficiently
4. Significance and Use
high purity to permit its use without lessening the accuracy of
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4.1 Determination of percent uranium content and U
the determination.
abundance in oxides and other materials containing high 7.2 Purity of Water—Unless otherwise indicated, references
concentrations of uranium is required for special nuclear
to water shall mean reagent water in conformance with
materials accountability, regulatory requirements, and process Specification D1193.
control.
7.3 Nitric Acid, HNO , concentrated (70 %).
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7.4 Nitric Acid, 0.8 M (5 % v/v)—Cautiously add 50 mL of
1 concentrated nitric acid to 950 mL of water.
This test method is under the jurisdiction ofASTM Committee C26 on Nuclear
Fuel Cycle and is the direct responsibility of Subcommittee C26.05 on Methods of
Test.
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CurrenteditionapprovedJune1,2004.PublishedJuly2004.Originallyapproved Reagent Chemicals, American Chemical Society Specifications, American
in 1997. Last previous edition approved in 1997 as C1380 – 97. DOI: 10.1520/ Chemical Society, Washington, D. C. For suggestions on the testing of reagents not
C1380-04. listed by theAmerican Chemical Society, Washington, D. C. For suggestions on the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or testing of reagents not listed by the American Chemical Society, see Analar
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset, U. K., and the
Standards volume information, refer to the standard’s Document Summary page on United States Pharmacopeia and National Formulary, U.S. Pharmacopeial Con-
the ASTM website. vention (USPC), Rockville, MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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C1380–04
7.5 NitricAcid,0.1M—Add6.5mLconcentratednitricacid 10.6 After conversion is complete and the sample is dry,
to '900 mL of water, mix, and bring to 1000 mL
...