Improve of Determination of Mn, Cr, Ni, Mo and Th in Uranium Dioxide Pallets

Uranium dioxide pallets were dissolved in HNO₃. Mn, Cr, Th were determined by ICP-OES and Ni, Mo by GAAS after separation by TBP resins. U and Th were adsorbed in 3 mol/L HNO₃ by TBP resins and Mn, Ni, Mo, Cr were received as solution A. Th was received as solution B after 8 mL dead volume. Solution A and B were steamed to nearly dry and then dissolve by dilute acid for measurement. The method is verified through reference material GBW04242. The measured values are in the confidence interval.