Determination of platinum group elements in chromite by nickel sulfide fire assay-high resolution continuum source graphite furnace atomic absorption spectrometry
MAO Xiang-ju1,2,3,4,5, XIAO Fang1,2,3,4,5, LIU Lu1,2,3,4,5, ZHANG Hong-li1,2,3,4,5, SUN Qi-liang1,2,3,4,5, NI Wen-shan*1,2,3,4,5
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; 3. Key Laboratory for Polymetallic Ores' Evaluation and Utilization, MNR, Zhengzhou 450006, China; 4. Key Laboratory of Comprehensive Utilization of Gold Resource in Henan Province, Zhengzhou 450006, China; 5. Northwest China Center for Geosience Innovation, Xi'an 710054, China
Abstract：A new nickel sulfide fire assay enrichment method followed by pre-sintering sample with sodium peroxide and calcium oxide was proposed for the analysis of platinum group elements in refractory chromite sample. The chromite sample could be completely decomposed. Then, 10mL of aqua regia (1+1) was used to dissolve sulfide precipitates of Pt, Pd, Ru, Rh and Ir as well as filter paper with microwave digestion system according to the optimized heating digestion program. These five elements could be fully dissolved in solution under high-temperature and high-pressure conditions of microwave digestion system, and then determined by high resolution continuum source graphite furnace atomic absorption spectrometry (HRCS-GFAAS). The ashing and atomization temperatures, atomization reading time and effective pixels of charge-coupled detector (CCD) for the determination of Pt, Pd, Ru, Rh and Ir were optimized. Under the optimal experimental conditions, the calibration curves were fitted by least square method based on the absorbance and corresponding mass concentration of Pt, Pd, Ru, Rh and Ir. The fitting of curves was good, and the determination coefficients were all higher than 0.9994. The characteristic concentration for Pt, Pd, Ru, Rh and Ir was 1.56, 1.98, 0.45, 1.27 and 3.06ng/mL, respectively. The proposed method was applied for the analysis of these five platinum group elements in the certified reference materials. The found results were in good agreement with the certified values. The relative standard deviations (RSD, n=5) of analysis results for Pt, Pd, Ru, Rh and Ir in actual chromite samples were between 5.0% and 14%. The proposed method could meet the analysis requirements of trace and ultra-trace Pt, Pd, Ru, Rh and Ir in chromite samples.
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MAO Xiang-ju, XIAO Fang, LIU Lu, ZHANG Hong-li, SUN Qi-liang, NI Wen-shan. Determination of platinum group elements in chromite by nickel sulfide fire assay-high resolution continuum source graphite furnace atomic absorption spectrometry. , 2020, 40(7): 40-46.
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