Semi-automated potentiometric titration method for uranium characterization

The manual version of the potentiometric titration method has been used for certification and characterization of uranium compounds. In order to reduce the analysis time and the influence of the analyst, a semi-automatic version of the method was developed in the Brazilian Nuclear Energy Commission. The method was applied with traceability assured by using a potassium dichromate primary standard. The combined standard uncertainty in determining the total concentration of uranium was around 0.01%, which is suitable for uranium characterization. ► We developed a semi-automatic version of potentiometric titration method. ► The method is used for certification and characterization of uranium compounds. ► The traceability of the method was assured by a K2Cr2O7 primary standard. ► The results of U3O8 reference material analyzed was consistent with certified value. ► The uncertainty obtained, near 0.01%, is useful for characterization purposes.