Determination of selenium and tellurium in gold concentrate by arsenic coprecipitation-inductively coupled plasma atomic emission spectrometry
ZHANG Hong-li1,2, NI Wen-shan*1,2,XIAO Fang1,2,MAO Xiang-ju1,2,YAO Ming-xing1,2, CUI Ru-liang3
1.Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Zhengzhou 450006, China; 2. China National Engineering Research Center for Utilization of Industrial Minerals, Zhengzhou 450006, China; 3. Luanchuan County Bureau of Geology and Mineral Resources,Luoyang 471500,China
Abstract：The sample was decomposed with nitric acid-hydrochloric acid-perchloric acid. With 2.0 mL of 1.0 mg/mL arsenic solution as aggregation agent, 250 g/L stannous chloride solution was added drop by drop and sodium hypophosphite (solid) was added as reducing agent to reduce selenium, tellurium and arsenic in solution as simple substance for coprecipitation. Then, the precipitation after filtration was dissolved with nitric acid -perchloric acid. Consequently, a determination method of selenium and tellurium in gold concentrate was established by inductively coupled plasma atomic emission spectrometry (ICP-AES) with Se 196.090{171} nm and Te 214.281{157} nm as analytical lines. The experiments indicated that selenium and tellurium could be separated from most interference elements (such as silver, lead, zinc, silicon, calcium, magnesium, aluminum and iron) in sample by arsenic coprecipitation, avoiding the interference of matrix. Gold in gold concentrate would be also reduced and partially separated out. However, the interference test indicated that the interference of this part of gold which was simultaneously separated from matrix solution with selenium and tellurium could be ignored. Under the selected experimental condition, the mass concentration of selenium and tellurium in range of 0.5-2.0 μg/mL showed good linearity with its emission intensity. The linear correlation coefficient(r) of calibration curve for selenium and tellurium was 0.999 2 and 0.999 1, respectively. The detection limit of selenium and tellurium in this method was 1.40 and 4.23 μg/g, respectively. The content of selenium and tellurium in actual gold concentrate was determined according to the experimental method. The results were consistent with those obtained by spectrophotometry. The relative standard deviation(RSD, n=8) was 2.0%-2.4% and 3.1%-3.3%, respectively.
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