Determination of total ionic-phase rare earth and component inion-adsorption rare earth ore by inductively coupled plasma mass spectrometry
SHI Yi-hua1,QIU Li1,TANG Bi-yu1,YANG Zhong-ping1, SONG Ci-an2,GU Xing-qian1
1.Testing Center, China Nonferrous MetalGuilinGeology and Mining Co.,Ltd.,Guilin 541004,China; 2. Engineering Research Center of Exploration for Hidden Non-Ferrous and Precious Metal Ore Deposits,Ministry of Education, Guilin University of Technology,Guilin 541004,China
Abstract：The ionic-phase rare earth in raw ores of ion-adsorption rare earth was extracted by ammonium sulfate and the calibration solution series were prepared with ammonium sulfate solution as matrix. Thus, a method for the determination of total ionic-phase rare earth and component in the sample solution was established by inductively coupled plasma mass spectrometry(ICP-MS). It showed that ionic-phase rare earth could be effectively extracted from 10.00 g of ion-adsorption rare earth ore samples which had been concussed for 15 min with 100 mL of 50 g/L ammonium sulfate solution added and kept still for 30 min; 5.0 g/L ammonium sulfate solution was used for matrix matching of calibration solution series, while 103Rh-185Re double inner standard method was used to calibrate the matrix effect of ammonium sulfate and the signal shift effect of instrument; the possible mass spectral interference was eliminated with appropriate isotopes. Under optimal conditions, the linear correlation coefficient of the calibration curve of fifteen rare earth elements within 10.0-100.0 μg/L were all larger than 0.999 91. The detection limit was 0.10-0.66 μg/g. When the method was employed to determine total ionic-phase rare earth and component in different ion-adsorption rare earth ore zones, the results were consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES). The relative standard deviation (RSD, n=11) was in the range of 1.0%-5.2 %, and the recovery was between 98% and 104%.
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