Abstract：The accurate determination of precious metal palladium in waste motors is of great significance to the comprehensive recycling of waste motors. The content of palladium in the waste motor is relatively low, and it also contains a large amount of copper. If the content of palladium is directly determined after acid dissolution, the matrix interference will be serious. In experiments, the lead fire assaying method was used for the separation and enrichment of palladium in waste motor samples. The method for determination of palladium in waste motors by flame atomic absorption spectrometry (FAAS) was established using air-acetylene flame. The determination wavelength was 247.6 nm.The amount of lead oxide, the cupellation temperature, and the measurement medium were optimized: the amount of lead oxide was 200 g, the cupellation temperature was 900 ℃, and the measurement medium was 10% (volume fraction) hydrochloric acid. The interference tests showed that the single presence or coexistence of lead, bismuth, tellurium and silver in sample will not affect the determination of palladium. The linear range of calibration curve was 1.00-4.00 μg/mL, and the correlation coefficient was 0.999 92. The limit of detection was 0.051 8 μg/mL, and the limit of quantification was 0.173 μg/mL. The content of palladium in waste motor was determined according to the experimental method, and the found results were basically consistent with those obtained by inductively coupled plasma atomic emission spectroscopy (ICP-AES). The relative standard deviations (RSD, n=7) were between 2.2% and 3.1%, and the recoveries were between 98% and 102%.
刘秋波, 王皓莹, 康羽. 铅试金-火焰原子吸收光谱法测定废旧电机中钯[J]. 冶金分析, 2022, 42(7): 26-31.
LIU Qiubo, WANG Haoying, KANG Yu. Determination of palladium in waste motor by flame atomic absorption spectrometry with lead fire assay. , 2022, 42(7): 26-31.
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