Determination of total-phase rare earth content in ion-adsorption rare earth ore by inductively coupled plasma mass spectrometry
SONG Xu-dong1,FAN Xiao-wei*1,2,CHEN Wen1,XU Na1,LI Ping1,JIANG Xiao-gang1
1. National Tungsten & Rare-earth Product Quality Supervision Testing Center, Ganzhou 341000, China; 2. Faculty of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
Abstract：After the sample was dissolved with nitric acid-hydrofluoric acid-perchloric acid mixture, the sample solution was determined by inductively coupled plasma mass spectrometry (ICP-MS). Consequently, a determination method of total-phase rare earth content in ion-adsorption rare earth ore by ICP-MS was proposed. The dosage of hydrofluoric acid and the content of nitric acid in determination solution were investigated. Finally, 5.0mL of hydrofluoric acid was selected and 2% (volume fraction) nitric acid was used as determination medium. Under the optimized instrumental conditions, the linear correlation coefficients of calibration curves for 15 rare earth elements were all higher than 0.9999. The detection limit was 2.4μg/g. The contents of total-phase rare earth in national certified reference materials (CRMs) of rare earth ore including GBW07158, GBW07160 and GBW07161 (the samples for CRMs formulation were all from Longnan ion-adsorption rare earth ore region in Jiangxi Province) were determined according to the experimental method, and the results were basically consistent with the certified values. The proposed method was applied for determination of total-phase rare earth content in national certified reference materials of rare earth ore (GBW07159 and GBW07160) and actual ion-adsorption rare earth ore samples. The relative standard deviations (RSD, n=11) for the results were between 1.7% and 3.1%.
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