Determination of copper, gold, platinum, palladium, selenium, tellurium, bismuth, iridium and rhodium in platinum and palladium concentrate by inductively coupled plasma atomic emission spectrometry with sealed digestion
LIU Fangmei1, LAI Qiuxiang1, WU Zhenxiang1, ZHONG Shuiping2
1. FuJian Key Laboratory for Green Production of Copper and Comprehensive Utilization of Associated Resources, Zijin Copper Co., Ltd., Shanghang 364204, China; 2. Zijin Mining Co., Ltd., Shanghang 364204, China
Abstract：The accurate determination of copper, gold, platinum, palladium, selenium, tellurium, bismuth, iridium and rhodium in platinum and palladium concentrates was an important theoretical support for the recovery of valuable metals from platinum and palladium concentrates. Platinum and palladium were commonly determined by the gravimetric method. The traditional determination method for copper, gold, selenium, tellurium and bismuth was inductively coupled plasma atomic emission spectrometry (ICP-AES), while the iridium and rhodium were determined one by one by atomic absorption spectrometry (AAS) after pre-enrichment by lead or antimony assay. However, it had many shortcomings such as slow analytical speed, long analytical period, complicated operation and high detection cost, which could not meet the actual detection requirements. In order to realize the accurate and rapid determination of above elements, the sample was digested in a sealed system, and then a direct determination method of copper, gold, platinum, palladium, selenium, tellurium, bismuth, iridium and rhodium in platinum and palladium concentrates was established by ICP-AES after a sample dissolution. The experimental results showed that 0.2 g of samples could be fully dissolved in 50 mL sealed digestion tank with aqua regia (1+1) as solvent, which was heated in drying oven at 160 ℃ for 6 h. Then the spectral interference was eliminated by selecting proper spectral lines. Consequently, the determination of various elements in platinum and palladium concentrate by ICP-AES was realized. Under the optimal experimental conditions, the linear correlation coefficients of calibration curves of test elements were all higher than 0.999. The limits of detection of method were 0.000 1%-0.001 6%. The proposed method was applied to the determination of copper, gold, platinum, palladium, selenium, tellurium, bismuth, iridium and rhodium in platinum and palladium concentrate samples. The relative standard deviations (RSD,n=11) of the results were between 0.33% and 4.8%. The recoveries were between 96% and103%.
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