Simultaneous determination of some trace metal impurities in high-purity sodium tungstate using coprecipitation and inductively coupled plasma atomic emission spectrometry
来源期刊：Rare Metals2004年第3期
论文作者：MA Xiaoguo, KUANG Tongchun, and LIU Qianjun Center of Analysis and Testing, Ouangdong University of Technology, Guangzhou , China
文章页码：193 - 196
摘 要：<正> A method based on the combination of coprecipitation with inductively coupled plasma atomic emission spectrometry （ICP-AES） was developed for the determination of impurities in high-purity sodium tungstate. Six dements （Co, Cu, Fe, Mn, Ni, and Pb） were coprecipitated by lanthanum hydroxide so as to be concentrated and separated from the tungsten matrix. Effects of some factors on the recoveries of the analytes and on the residual amount of sodium tungstate were investigated, and the optimum conditions for the coprecipitation were proposed. Matrix-matching calibration curve method was used for the analysis. It is shown that the elements mentioned above can be quantitatively recovered. The detection limits for Co, Cu, Fe, Mn, Ni, and Pb are 0.07, 0.4, 0.2, 0.1, 0.6, and 1.3 μg.g-1, respectively. The recoveries vary from 92.5% to 108%, and the relative standard deviations （RSDs） are in the range of 3.1%-5.5%.
MA Xiaoguo, KUANG Tongchun, and LIU Qianjun Center of Analysis and Testing, Ouangdong University of Technology, Guangzhou 510090, China
摘 要：<正> A method based on the combination of coprecipitation with inductively coupled plasma atomic emission spectrometry （ICP-AES） was developed for the determination of impurities in high-purity sodium tungstate. Six dements （Co, Cu, Fe, Mn, Ni, and Pb） were coprecipitated by lanthanum hydroxide so as to be concentrated and separated from the tungsten matrix. Effects of some factors on the recoveries of the analytes and on the residual amount of sodium tungstate were investigated, and the optimum conditions for the coprecipitation were proposed. Matrix-matching calibration curve method was used for the analysis. It is shown that the elements mentioned above can be quantitatively recovered. The detection limits for Co, Cu, Fe, Mn, Ni, and Pb are 0.07, 0.4, 0.2, 0.1, 0.6, and 1.3 μg.g-1, respectively. The recoveries vary from 92.5% to 108%, and the relative standard deviations （RSDs） are in the range of 3.1%-5.5%.
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