ISO 7476:2003
Nuclear fuel technology — Determination of uranium in uranyl nitrate solutions of nuclear grade quality — Gravimetric method
ISO 7476:2003 specifies a precise and accurate gravimetric method for determining the mass fraction of uranium in uranyl nitrate solutions of nuclear grade quality containing more than 100 g/kg of uranium.
Non-volatile impurities influence the accuracy of the method.
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TitlePage - Nuclear fuel technology— Determination of uranium in uranyl nitrate solutions of nuc...
TableofContent - Contents Page
Foreword - Foreword
Scope - 1 Scope
NormativeReference - 2 Normative references
Clause1 - 3 Principle
Clause1 - 4 Interferences
Clause1 - 5 Reagents
UntitledSubclause2 - 5.1 Ashless filter-paper powder
UntitledSubclause2 - 5.2 Concentrated nitric acid
UntitledSubclause2 - 5.3 Nitric acid solution
UntitledSubclause2 - 5.4 Standard uranyl nitrate solution
Clause1 - 6 Apparatus
UntitledSubclause2 - 6.1 Platinum crucibles
UntitledSubclause2 - 6.2 Weighing burette
UntitledSubclause2 - 6.3 Infrared heating lamp
UntitledSubclause2 - 6.4 Hotplate
UntitledSubclause2 - 6.5 Muffle furnace
UntitledSubclause2 - 6.6 Desiccator
UntitledSubclause2 - 6.7 Analytical balance
Clause1 - 7 Procedure
UntitledSubclause2 - 7.1 Ignite a platinum crucible (
UntitledSubclause2 - 7.2 Weigh out between
UntitledSubclause2 - 7.3 Evaporate carefully to a volume of between about
UntitledSubclause2 - 7.4 Add sufficient ashless filter-paper powder (
UntitledSubclause2 - 7.5 Place the crucible and dried contents in the muffle furnace (
UntitledSubclause2 - 7.6 Heat the sample in air with the muffle furnace (
UntitledSubclause2 - 7.7 Determine the non-volatile impurities which may be present in the ign...
UntitledSubclause2 - 7.8 Empty the platinum crucible and clean by boiling in the nitric acid s...
Clause1 - 8 Expression of results
UntitledSubclause2 - 8.1 Calculate the mass,
UntitledSubclause2 - 8.2 Calculate the mass,
UntitledSubclause2 - 8.3 Calculate the total mass of impurities (in the ignited state),
UntitledSubclause2 - 8.4 Calculate the corrected mass of U
UntitledSubclause2 - 8.5 Calculate the gravimetric conversion factor for uranium,
UntitledSubclause2 - 8.6 Calculate the mass fraction of uranium in the sample,
Clause1 - 9 Procedure validation and quality control
Clause1 - 10 Repeatability
Clause1 - 11 Accuracy and bias
Clause1 - 12 Test report
AnnexNormative - Gravimetric conversion factors for non-volatile impurities
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TitlePage - Nuclear fuel technology— Determination of uranium in uranyl nitrate solutions of nuc...
TableofContent - Contents Page
Foreword - Foreword
Scope - 1 Scope
NormativeReference - 2 Normative references
Clause1 - 3 Principle
Clause1 - 4 Interferences
Clause1 - 5 Reagents
UntitledSubclause2 - 5.1 Ashless filter-paper powder
UntitledSubclause2 - 5.2 Concentrated nitric acid
UntitledSubclause2 - 5.3 Nitric acid solution
UntitledSubclause2 - 5.4 Standard uranyl nitrate solution
Clause1 - 6 Apparatus
UntitledSubclause2 - 6.1 Platinum crucibles
UntitledSubclause2 - 6.2 Weighing burette
UntitledSubclause2 - 6.3 Infrared heating lamp
UntitledSubclause2 - 6.4 Hotplate
UntitledSubclause2 - 6.5 Muffle furnace
UntitledSubclause2 - 6.6 Desiccator
UntitledSubclause2 - 6.7 Analytical balance
Clause1 - 7 Procedure
UntitledSubclause2 - 7.1 Ignite a platinum crucible (
UntitledSubclause2 - 7.2 Weigh out between
UntitledSubclause2 - 7.3 Evaporate carefully to a volume of between about
UntitledSubclause2 - 7.4 Add sufficient ashless filter-paper powder (
UntitledSubclause2 - 7.5 Place the crucible and dried contents in the muffle furnace (
UntitledSubclause2 - 7.6 Heat the sample in air with the muffle furnace (
UntitledSubclause2 - 7.7 Determine the non-volatile impurities which may be present in the ign...
UntitledSubclause2 - 7.8 Empty the platinum crucible and clean by boiling in the nitric acid s...
Clause1 - 8 Expression of results
UntitledSubclause2 - 8.1 Calculate the mass,
UntitledSubclause2 - 8.2 Calculate the mass,
UntitledSubclause2 - 8.3 Calculate the total mass of impurities (in the ignited state),
UntitledSubclause2 - 8.4 Calculate the corrected mass of U
UntitledSubclause2 - 8.5 Calculate the gravimetric conversion factor for uranium,
UntitledSubclause2 - 8.6 Calculate the mass fraction of uranium in the sample,
Clause1 - 9 Procedure validation and quality control
Clause1 - 10 Repeatability
Clause1 - 11 Accuracy and bias
Clause1 - 12 Test report
AnnexNormative - Gravimetric conversion factors for non-volatile impurities