Determination of lanthanum, cerium and yttrium in rare-earth tungsten electrode by inductively coupled plasma atomic emission spectrometry with precipitation separation
LI Tian1,2, LIU Li-yuan1, WANG Xue-fei1, ZHANG Li-jiu1, TIAN Xin1, SONG Yu-fang1
1. Guobiao (Beijing) Testing & Certification Co., Ltd., Beijing 100088, China; 2. China United Test & Certification Co., Ltd., Beijing 100088, China
Abstract：It had positive effects for accurate determination of rare-earth elements in rare-earth tungsten electrode on the investigation of product physical and chemical peoperties, the control of product quality and the promotion of product performance upgrading. The sample was decomposed with 3.0mL of hydrofluoric acid and 2.0mL of nitric acid. After perchloric acid fuming, most of the matrix was precipitated in the form of tungstic acid (H2WO4), which accelerated the reaction speed and meanwhile avoided the interference of matrix with determination of rare-earth element. La 333.7nm, Ce 418.6nm and Y 360.0nm were selected as the analytical lines. The contents of lanthanum, cerium and yttrium in rare-earth tungsten electrode were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The linear correlation coefficients of calibration curves were all higher than 0.9999. The limits of detection were between 0.003% and 0.006%. The proposed method was applied for the determination of rare-earth tungsten electrode actual sample. The relative standard deviation (RSD, n=7) of determination results were between 1.5% and 3.2%, and the recoveries were between 98% and 101%.
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