Method for determining concentrations of uranyl nitrate and nitric acid in aqueous phase at same time

The invention belongs to the technical field of radioactive substance measurement and relates to a method for determining concentrations of uranyl nitrate and nitric acid in an aqueous phase at the same time. The method comprises the following steps: (1) preparing a series of nitric acid solution and uranyl nitrate solution with known concentrations; (2) respectively determining Raman spectra of the nitric acid solution and uranyl nitrate solution with the known concentrations; (3) creating a standard curve of a nitrate concentration; (4) creating a standard curve of a uranyl ion concentration; (5) determining a Raman spectrum of a sample and calculating ANO/AH2O and AUO2/AH2O; and (6) calculating the concentrations of uranyl nitrate and nitric acid in the sample. By utilizing themethod for determining the concentrations of uranyl nitrate and nitric acid in the aqueous phase at the same time, direct measurement, no pretreatment, high selectivity and high measurement speed canbe realized, and an optica