ISO 9463:2019
Nuclear energy — Nuclear fuel technology — Determination of plutonium in nitric acid solutions by spectrophotometry
This document specifies an analytical method by spectrophotometry, for determining the plutonium concentration in nitric acid solutions, with spectrophotometer implemented in hot cell and glove box allowing the analysis of high activity solutions. Commonly, the method is applicable, without interference, even in the presence of numerous cations, for a plutonium concentration higher than 0,5 mg·l−1 in the original sample with a standard uncertainty, with coverage factor k = 1, less than 5 %.
The method is intended for process controls at the different steps of the process in a nuclear fuel reprocessing plant or in other nuclear facilities.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Chemical conditions
5.1 Stability of Pu(VI)
5.2 Rate of oxidation of Pu(IV) to Pu(VI)
5.3 Destruction of the excess oxidant
5.4 Comparison of Ce(IV) and Ag(II)
5.5 Molar extinction coefficient of Pu(VI)
6 Reagents
6.1 General
6.2 Common reagents for methods using silver oxide or cerium as oxidant
6.3 Reagents for method using silver oxide as oxidant
6.4 Reagents for method using Ce(IV) as oxidant
7 Apparatus
8 Test procedure
8.1 Preparation of the different solutions
8.1.1 Plutonium calibration solution
8.1.2 Sample solutions
8.2 Spectrophotometer setup
8.3 Measurements
8.3.1 Background measurement
8.3.2 Measurements on the calibration solution
8.3.3 Measurements on the sample solution
9 Expression of the result
9.1 Calculation of the concentration of plutonium in the sample
9.2 Reproducibility
9.3 Detection limit
10 Interferences
10.1 Anions
10.2 Cations
Annex A (informative) Preparation of silver (II) oxide (AgO)
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Chemical conditions
5.1 Stability of Pu(VI)
5.2 Rate of oxidation of Pu(IV) to Pu(VI)
5.3 Destruction of the excess oxidant
5.4 Comparison of Ce(IV) and Ag(II)
5.5 Molar extinction coefficient of Pu(VI)
6 Reagents
6.1 General
6.2 Common reagents for methods using silver oxide or cerium as oxidant
6.3 Reagents for method using silver oxide as oxidant
6.4 Reagents for method using Ce(IV) as oxidant
7 Apparatus
8 Test procedure
8.1 Preparation of the different solutions
8.1.1 Plutonium calibration solution
8.1.2 Sample solutions
8.2 Spectrophotometer setup
8.3 Measurements
8.3.1 Background measurement
8.3.2 Measurements on the calibration solution
8.3.3 Measurements on the sample solution
9 Expression of the result
9.1 Calculation of the concentration of plutonium in the sample
9.2 Reproducibility
9.3 Detection limit
10 Interferences
10.1 Anions
10.2 Cations
Annex A (informative) Preparation of silver (II) oxide (AgO)
Bibliography