Determination of indium in flue dust by inductively coupledplasma mass spectrometry
NI Wen-shan1,2,3,ZHANG Hong-li1,2,3,GAO Xiao-fei1,2,3,YAO Ming-xing1,2,3,XIAO Fang*1,2,3,MAO Xiang-ju1,2,3
1. Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, CAGS, Zhengzhou 450006, China; 2. China National Engineering Research Center for Utilization of Industrial Minerals, Zhengzhou 450006, China; 3. Key Laboratory of Evaluation and Multipurpose Utilization of Polymetallic Ores Ministry of Land andResources,Zhengzhou 450006, China
Abstract：During the determination of indium in flue dust by inductively coupled plasma mass spectrometry (ICP-MS), the interference of polyatomic molecular ion and isobar of 115Sn could not be ignored. The flue dust sample was dissolved with HCl, HNO3, HF and HClO4. 115In was selected as testing isotope and 100ng/mL 185Re was used as internal standard. The interference of polyatomic molecular ion was eliminated by kinetic energy discrimination collision cell (KED). The interference of isobar of 115Sn was eliminated by mathematical correction equation. The determination of indium in flue dust by ICP-MS was realized. The interference of 115Sn with the determination of 115In was systemically investigated. The results showed that the interference amount of 115Sn with 115In was linearly related to the content of Sn. Therefore, the mathematical correction equation for the correction of 115Sn interference was obtained. The content of Sn in sample solution was relatively high, which usually exceeded the determination range of ICP-MS. Thus ICP-AES was selected for determination of Sn followed by correction of Sn with mathematical correction equation. The content of indium in flue dust sample was determined in standard mode and KED mode, respectively. The results indicated that the determination results of indium in KED mode were basically consistent with the comparison values (the determination results obtained by butyl acetate extraction-atomic absorption spectrometry), while the determination results in standard mode were relatively high. Meanwhile, it was found that the background equivalent concentration of indium and detection limit of method in KED mode were about one order of magnitude lower than those in standard mode. Therefore, the KED mode was employed and its experimental conditions were optimized. The flow rate of collision gas at 4.90mL/min was selected. Under the selected experimental conditions, the mass spectral intensity showed good linear relationship with the corresponding mass concentration in range of 5-100ng/mL. The correlation coefficient of calibration curve was 0.9994. The detection limit of method was 0.0046ng/mL. The proposed method was applied for determination of indium in actual samples of flue dust. The relative standard deviations (RSD, n=6) were between 0.20% and 1.3%. The recoveries were between 98% and 102%.
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