Determination of thorium in mineral samples by inductively coupled plasma atomic emission spectrometry after preconcentration through coprecipitation of magnesium hydroxide
NI Wen-shan
1. Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,CAGS,Zhengzhou 450006,China;2.China National Engineering Research Center for Utilization of Industrial Minerals,Zhengzhou 450006,China
Abstract： The mineral samples were melted and decomposed by Na2O2. After being leached with 100 mL of hot triethanolamine (5+95), Fe,Al and Ti in mineral samples could be dissolved into the base solution to form complex with triethanolamine. And the coprecipitates of Mg(OH)2 and trace thorium were formed by adding 2 mL of MgCl2（20 g/L）into the solution. After filtering , the coprecipitates were then dissolved with hot HCl(1+2) , and the content of thorium in the solution was determined by inductively coupled plasma atomic emission spectrometry at 283.730{118}nm under the selected instrumental parameters. The pretreatment of sample was simple and fast; moreover, the spectrum interference of other elements on thorium was not significant at the wavelength of 283.730{118}nm. There was a good linear relationship between emission intensity of thorium and the mass concentration of Th in the solution in the range of 0-2 μg/mL. The correlation coefficient of calibration curve was 0.999 9, and the detection limit of this method was 0.038 μg/mL. The content of thorium in CRMs was determined by this method and the results were consistent with the certified values, with the relative standard deviation (n=6) between 0.54%-3.9%.
倪文山. 氢氧化镁共沉淀-电感耦合等离子体原子发射光谱法测定矿石样品中钍[J]. 冶金分析, 2013, 33(1): 13-16.
NI Wen-shan. Determination of thorium in mineral samples by inductively coupled plasma atomic emission spectrometry after preconcentration through coprecipitation of magnesium hydroxide. , 2013, 33(1): 13-16.
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