UNE-EN ISO 12183:2024

This document describes an analytical method for the electrochemical measurement of pure plutoniumnitrate solutions of nuclear grade, with an expanded uncertainty not exceeding ±0,2 % at the confidencelevel of 0,95 for a single determination (coverage factor, k = 2). The method is suitable for aqueoussolutions containing plutonium at more than 0,5 g/L and test samples containing plutonium between4 mg and 15 mg. Application of this technique to solutions containing plutonium at less than 0,5 g/L andtest samples containing plutonium at less than 4 mg requires experimental demonstration by the userthat applicable data quality objectives will be met.For some applications, the purification of test samples by anion exchange is required beforemeasurement to remove interfering substances present in significant amounts. Clause 10 provides adiscussion of interferences and corrective actions. Purification is also appropriate in situations wherethe purity of the test sample is unknown or when it may fluctuate unpredictably in a manufacturingprocess.Clause 11 discusses the changes in application of the method and methodology that can be applied andimportant considerations when selecting measurement parameters, while still remaining within theintended scope of this document.