Determination of trace rhenium in molybdenite concentrate by matrix separation-inductively coupled plasma atomic emission spectrometry
WANG Jingfeng1,2,3,4
1. Technology Development of Western Mining Group Co.,Ltd.,Xining 810006,China; 2. The Engineering and Technology Research of Qinghai Western Mining Co.,Ltd.,Xining 810006,China; 3. Qinghai Key Laboratory Plateau Comprehensive Utilization and Mineral Processing Engineering,Xining 810006,China; 4. Qinghai Nonferrous Mineral Resources Engineering Technology Research Center,Xining 810006,China
Abstract：During the determination of rhenium in molybdenite concentrate by inductively coupled plasma atomic emission spectrometry(ICP-AES), molybdenum has serious spectral interference due to its abundant spectral lines. In order to eliminate the interference of matrix molybdenum with the determination of rhenium, the sample was dissolved with 30 mL of nitric acid, 1 mL of ammonium bifluoride and 40 mL of hydrogen peroxide in experiments. The matrix molybdenum was oxidized to molybdenum trioxide precipitate for filtration. Re 197.312 nm was selected as the analytical line for rhenium. The method for the determination of trace rhenium in molybdenite concentrate by ICP-AES after matrix separation was established. The results showed that the linear correlation coefficient (r) of calibration curve was 0.999 99. The limit of detection was 0.000 2%. The content of rhenium in molybdenite concentrate sample was determined according to the experimental method, and the relative standard deviations (RSD, n=6) of measurement results were between 5.6% and 6.0%. The content of rhenium in certified reference material (GBW07144) and sample of molybdenite concentrate was determined according to the experimental method and spectrophotometry in YS/T 555.10-2009. The found results of two methods were consistent.
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