Abstract：Niobium-manganese-iron alloy is important raw material in steel making process, so it is necessary to establish the method for the determination of niobium and manganese. Niobium and manganese are the major elements in niobium-manganese-iron alloy and their contents are high. The mutual interference of major elements exists in the chemical wet analysis of niobium-manganese-iron, which influences on the accuracy of determination. The sample was dissolved with hydrochloric acid, nitric acid and hydrofluoric acid. Nb 269.706nm was selected as the analytical line for niobium and Mo 281.618nm was used as the internal standard line. Mn 293.305nm was selected as the analytical line for manganese and V 292.401nm was used as the internal standard line. The determination method of niobium and manganese in niobium-manganese-iron alloy by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established. The interference correction tests of coexisting elements showed that the coexisting elements in sample had no influence on the testing elements. The linear correlation coefficients of calibration curves for testing elements were all higher than 0.9995. The experimental method was applied for the determination of niobium and manganese in actual niobium-manganese-iron alloy sample. The relative standard deviation (RSD, n=11) of determination results for niobium was 0.26%-0.28%, and the RSD for manganese was 0.29%-0.33%. The contents of niobium and manganese in actual niobium-manganese-iron alloy sample were determined according to the experimental method. The found results were basically consistent with those obtained by JIS G 1328-1982 Determination of niobium content by tannic acid hydrolysis gravimetric method and GB/T 5686.1-2008 Determination of manganese content by perchloric acid oxidation titration method.
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