Determination of cadmium and lead in rare earth based hydrogen storage alloy by inductively coupled plasma mass spectrometry
BAO Xiang-chun1, 2, ZHANG Hui-zhen1,2, LIU Xiao-jie1,2, GAO Li-zhen1,2, GAO Li-hong1,2
1. Baotou Research Institute of Rare Earths,Baotou 014030,China; 2.Ruike National Engineering Research Center of Rare Earth Metallurgy and Function Materials,Baotou 014030,China
Abstract：Afer the sample was dissolved with nitric acid at low temperature, a determination method of cadmium and lead in rare earth based hydrogen storage alloy was established by inductively coupled plasma mass spectrometry (ICP-MS) with 2% (V/V) nitric acid as determination medium. 111Cd and 208Pb were selected as determination isotopes to eliminate the mass spectrometry interference of isobars and polyatomic ions. The matrix effect and instrumental signal drift were corrected with 10.0 ng/mL 133Cs as internal standard. The correlation coefficients of calibration curves for cadmium and lead were higher than 0.999 8, indicating the good linear relationship. The detection limit of method was 0.03 ng/mL and 0.04 ng/mL, respectively. While the lower limit of determination was 0.10 ng/mL and 0.13 ng/mL, respectively. The synthetic samples of rare earth based hydrogen storage alloy were prepared by adding standard solution of cadmium and lead into rare earth based hydrogen storage alloy samples, and then treated and determined according to the experimental method. The results were consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES). The proposed method was applied for the determination of lead in rare earth based hydrogen storage alloy. The relative standard deviation (RSD, n=11) was 4.2%. The recoveries for cadmium and lead were 96%-104% and 95%-102%, respectively.
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BAO Xiang-chun, ZHANG Hui-zhen, LIU Xiao-jie, GAO Li-zhen, GAO Li-hong. Determination of cadmium and lead in rare earth based hydrogen storage alloy by inductively coupled plasma mass spectrometry. , 2017, 37(3): 53-57.
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