Determination of platinum and palladium in leaching solution of platinum-palladium ore by graphite furnace atomic absorption spectrometry after the preconcentration with lead fire assay
YAO Mingxing1,2,3, MAO Xiangju1,2,3, SUN Qiliang1,2,3, ZHANG Hongli1,2,3, NI Wenshan*1,2,3
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
Abstract：The accurate determination of platinum and palladium in leaching solution of platinum-palladium ore had very important significance for the comprehensive utilization of platinum and palladium. The content of platinum and palladium in leaching solution of platinum-palladium ore was relatively low. Moreover, it contained many coexisting ions. The interference would be serious if the contents of platinum and palladium in solution were directly determined. After the separation and enrichment of platinum and palladium in sample were realized by lead fire assay, a new method for determination of platinum and palladium in leaching solution of platinum-palladium ore by graphite furnace atomic absorption spectrometry (GF-AAS) was established based on the optimization of instrumental parameters. 10 mL of leaching solution of platinum-palladium ore was dropwise added into the groove of lead fire assay recipe. The silver nitrate solution was added as the cupellation protector. Then the groove was covered by assay recipe. After high-temperature melting and cupellation, platinum and palladium in sample was enriched into silver alloy granule. After the silver alloy granule was dissolved by adding nitric acid and then hydrochloric acid, the contents of platinum and palladium in sample were determined by GF-AAS. The graphite furnace ash temperature and atomization temperature of platinum and palladium as well as their reading times of atomization were optimized. Under the selected optimal experimental conditions, the calibration curve was fitted by the least square method of quadratic equation with the absorbance of platinum and palladium and the corresponding mass concentrations. The curve fit was good, and the determination coefficients were 0.999 8 and 0.999 7 for platinum and palladium, respectively. The characteristic concentrations were 2.14 ng/mL and 0.34 ng/mL, respectively. The proposed method was applied for determination of leaching solution sample of platinum-palladium ore. The relative standard deviations (RSD, n=6) of determination results were between 2.7% and 5.7%. The recoveries were between 84% and 118%, which could meet the requirements in National Geological and Mineral Industry Standard DZ/T 0130-2006.
姚明星, 毛香菊, 孙启亮, 张宏丽, 倪文山. 铅试金-石墨炉原子吸收光谱法测定铂钯矿浸出液中铂和钯[J]. 冶金分析, 2021, 41(9): 34-40.
YAO Mingxing, MAO Xiangju, SUN Qiliang, ZHANG Hongli, NI Wenshan. Determination of platinum and palladium in leaching solution of platinum-palladium ore by graphite furnace atomic absorption spectrometry after the preconcentration with lead fire assay. , 2021, 41(9): 34-40.
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