Abstract：The content of impurity elements such as Li, Na, Mg and Ca in zirconium materials directly influences the property of materials. Therefore, the rapid and accurate determination of Li, Na, Mg and Ca in sponge zirconium of nuclear grade has important significance. The sample was dissolved with HNO3-HF. Li 670.784nm, Na 589.592nm, Mg 279.553nm and Ca 422.673nm were selected as the analytical lines. The contents of Li, Na, Mg and Ca were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Consequently,a determination method of Li, Na, Mg and Ca in sponge zirconium of nuclear grade was established. The concentration of HNO3 in determination system should be less than 1.50mol/L. The standard curve method and standard addition method were compared. The results showed that the slope of calibration curve for each element by standard addition method was always lower than that of standard curve method. When the standard curve method and standard addition method were used, the recoveries for the determination results of Li, Na and Ca were 93%-106%. However, the determination result of Mg by standard addition method was higher than that of standard curve method. Moreover, the recovery of standard addition method was better than that of standard curve method. Therefore, the influence of matrix effect was eliminated by preparing the calibration curve with standard addition method. The linearity of calibration curves was good for elements with concentration in range of 0.10-2.0mg/L, and the correlation coefficients were higher than 0.999. The detection limits of elements were between 0.06mg/kg and 2.34mg/kg. The proposed method was applied for determination of Li, Na, Mg and Ca in sponge zirconium of nuclear grade. The relative standard deviations (RSD, n=6) of determination results were less than 10%. The recoveries were between 94% and 109%.
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