Determination of niobium, titanium, tantalum, silicon, aluminium and phosphorus in ferroniobium by inductively coupled plasma atomic emission spectrometry
SHAO Hai-zhou, LIU Cheng-hua
Shanghai Baosteel Industry Inspection Corp. Ningbo Branch, Ningbo 315800, China
Abstract：After ferroniobium samples were dissolved with nitric acid and hydrofluoric acid at 60 ℃，the content of niobium, titanium, tantalum, silicon, aluminum and phosphorus was simultaneously determined by inductively coupled plasma atomic emission spectrometry. In order to eliminate the influence of matrix elements on the determination of testing elements, and overcome the problem that the testing elements were beyond the linear range of calibration curve, which was due to the narrow content range of testing elements in ferroniobium certified reference materials during the plotting of calibration curve, the ferroniobium certified reference materials were used as substrate, and the calibration curve was established by adding proper amount of standard series solutions. The high content of niobium in sample was determined by high precision method, improving the accuracy of determination results. The proposed method was applied to the determination of niobium, titanium, tantalum, silicon, aluminum and phosphorus in ferroniobium certified reference materials. The results were consistent with the certified values. The relative standard deviations (RSD) were smaller than 1.5 %.
