Abstract：The determination of impurity elements in niobium by spectrophotometry, atomic absorption spectrometry and direct-current arc atomic emission spectrometry is cumbersome and time-consuming. A method for determination of the contents of 12 impurity elements such as Al, Cr, Fe, HF, Mn, Mo, Ni, Si, Ta, Ti, W and Zr in niobium was proposed by inductively coupled plasma atomic emission spectrometry (ICP-AES). A series of standard solutions were prepared by matrix matching method to eliminate the influence of matrix effect. At the same time, the interference analysis of multiple spectral lines was carried out to determine the spectral lines of test elements. The linear correlation coefficients of calibration curves of test elements were all not less than 0.999 9. The limits of detection of this method were in range of 0.000 1%-0.000 6% (mass fraction,similarly hereinafter). The limits of quantification were in range of 0.000 4%-0.001 9%. The contents of 12 impurity elements in niobium sample were determined according to the experimental method. The relative standard deviations (RSD, n=12) of the results were between 1.9% and 9.9%, and the recoveries were between 90% and 110%. The determination results were consistent with those obtained by other methods in standard methods.
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