Determination of platinum and palladium in insoluble slag of waste catalyst for petrochemical industry by inductively coupled plasma atomic emission spectrometry after alkali fusion-tellurium coprecipitation enrichment
TAN Wen-jin,ZHENG Yun,HE Xiao-tang,XIAO Xiong,LIN Bo,MA Wang-rui
State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,Sino Platinum Metals Resources (Yimen) Co.,Ltd.,Kunming 650106,China
Abstract：The sample was fused with sodium peroxide at high temperature. Then, the platinum and palladium were enriched by stannous chloride reduction and tellurium coprecipitation in 3.0-4.5 mol/L hydrochloric acid medium. Pt 265.945 nm and Pd 340.458 nm were selected as the analytical lines. The determination method of platinum and palladium in insoluble slag of waste catalyst for petrochemical industry by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established. When the mass concentration of platinum and palladium in sample was in range of 2-27 μg/mL and 0.7-20 μg/mL, the linear equation of calibration curves was IPt=3 624×ρPt-180.4 and IPd=9 869×ρPd-220.9, respectively. The linear correlation coefficients (R2) were both 0.999 98. The detection limit of platinum and palladium in this method was 0.017 μg/mL and 0.004 2 μg/mL, respectively. The content of platinum (109-1 342 g/t) and palladium (37-977 g/t) in insoluble slag of waste catalyst for petrochemical industry was determined according to the experimental method. The relative standard deviation (RSD, n=5-11) was 1.1%-1.9% and 1.1%-3.6%, respectively. The determination results were consistent with those obtained by fire assaying enrichment-inductively coupled plasma atomic emission spectrometry. The recoveries of platinum and palladium were 99%-100% and 100%, respectively.
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TAN Wen-jin,ZHENG Yun,HE Xiao-tang,XIAO Xiong,LIN Bo,MA Wang-rui. Determination of platinum and palladium in insoluble slag of waste catalyst for petrochemical industry by inductively coupled plasma atomic emission spectrometry after alkali fusion-tellurium coprecipitation enrichment. , 2016, 36(2): 43-48.
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