ICP-AES Determination of 17 Kinds of Trace Impurity Elements in Sponge Zirconium of Nuclear Purity Grade

The sample (2.500 0 g) was dissolved in 10 mL of 3 mol·L^-1 nitric acid solution with dropwise addition of hydrofluoric acid. After cooling and making up its volume to 50 mL, 5.00 mL of the sample solution was mixed with definite amount of mixed standard soluntion of the 17 kinds of elments, and diluted with 3 mol·L^-1 nitric acid solution to 50 mL for ICP-AES detemination of the 17 kinds of elements. Matrix interference was effectively overcomed by using standard addition method. Linear relationships were found between the intensity of anlaytical lines and the mass concentrations of the 17 kinds of elements. The linearity range of Co, Cu, Mn, Mo, Ni, Pb, V and Ti was 0.10-2.0 mg·L^-1, the linearity range of Al, Cr, Hf, Mg, Nb, Ta and Zn was 0.20-4.0 mg·L^-1, and the linearity range of Fe and Sn was 0.40-8.0 mg·L^-1. Detection limits (3s) of 17 kinds of elements were in the range of 1.0-50 μg·L^-1. Recovery rates obtained by standard addition method ranged from 90.0% to 108%, and RSDs (n=6) were less than 10%.