Discussion on standard method for determination of tungsten, molybdenum and niobium in steels by inductively coupled plasma atomic emission spectrometry
YU Yuan-jun, KANG De-hua, YANG Li-rong, GAO Pin, WANG Ying, DENG Jun-hua
Iron & Steel Research Institute of Ansteel Group, Anshan 114009, China
Abstract：The sample was decomposed with hydrochloric acid, nitric acid and hydrofluoric acid followed by smoking of phosphoric acid and perchloric acid. The internal standard yttrium and tartaric acid solution could be added if necessary. The contents of tungsten, molybdenum and niobium in steels were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Based on the optimization of instrumental parameters, W 207.911nm, Mo 202.030nm, Mo 281.615nm, Nb 309.418nm and Nb 316.340nm were selected as the analytical lines by considering the sensitivity and interference. Meanwhile, the possible interference elements were investigated. The influence of matrix effect was eliminated through matrix matching between standard solution series and major elements in tested samples. The linear correlation coefficients of all calibration curves were higher than 0.998. The detection limit of tungsten, molybdenum and niobium was 0.0370, 0.0379 and 0.0629mg/L, respectively. The proposed method was suitable for the determination of tungsten, molybdenum and niobium in steels with mass fraction of 0.005%-19.0%, 0.005%-8.0% and 0.005%-5.0%, respectively. The precision tests conducted by seven accredited iron and steel industry laboratories indicated that proposed method had good repeatability and reproducibility.
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YU Yuan-jun, KANG De-hua, YANG Li-rong, GAO Pin, WANG Ying, DENG Jun-hua. Discussion on standard method for determination of tungsten, molybdenum and niobium in steels by inductively coupled plasma atomic emission spectrometry. , 2018, 38(7): 73-79.
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