Abstract：During the determination of niobium in steel by inductively coupled plasma atomic emission spectrometry (ICP-AES),the conventional analytical line of niobium (Nb 316.340 nm) is not available in many types of ICP-AES instruments.Therefore, it is necessary to select other available analytical lines.The determination of niobium in steel by ICP-AES was established using Nb 269.706 nm as the analytical line.The spectral interference was corrected by multi-component spectral fitting (MSF).The results showed that iron had spectral interference with Nb 269.706 nm,which deteriorated the linearity of calibration curve prepared by certified reference materials with different contents,thus seriously affecting the analysis accuracy.After correcting the spectral interference of iron with Nb 269.706 nm by MSF method,the linear correlation coefficient of calibration curve was 0.999 9.The limit of detection was 0.000 7%.The content of niobium in actual steel samples was determined according to the experimental method.The relative standard deviations (RSD, n=6) of measured results were between 1.4% and 11%. The recoveries were between 92% and 101%.The measured results of niobium in steel certified reference materials were consistent with the certified value, which proved the accuracy of this method.
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