Determination of platinum, palladium and gold in geological samples by inductively coupled plasma atomic emission spectrometry
SUN Hong-lin1,2,WANG Lin*1,2, CHEN Hao-feng1,2,LIU Jun1,2,LIAN Wen-li1,2
1.Henan Province Rock & Mineral Testing Centre, Zhengzhou 450012, China; 2.Ministry of Land and Resources Key Laboratory of Precious Metals Analysis Technology, Zhengzhou 450012, China
Abstract：The sample was decomposed by KClO3 in HCl-H2O2 wet system. It not only overcame the influence of NO3- to platinum and palladium, but also greatly enhanced the decomposition capacity. After decomposition in HCl-H2O2-KClO3 high-efficiency wet system, the sample solution was separated and enriched by activated carbon-717 anion exchange resin mixed adsorbent in 10% (V/V) HCl medium. The influence of interference elements could be effectively eliminated. The Pt 265.945{127} nm, Pd 340.458{99} nm and Au 242.795{139} nm were used as analytical lines. The determination method of platinum, palladium and gold in geological samples by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established. The detection limit of platinum, palladium and gold was 0.015,0.012 and 0.005 1 μg/g, respectively. The low limit of determination was 0.050,0.040 and 0.017 μg/g, respectively. The platinum, palladium and gold in standard geological samples were determined according to the experimental method, and the relative standard deviations (RSD, n=10) were less than 6.7%. The found results were consistent with the certified values.
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