Determination of zirconium and hafnium in iron concentrate ore by inductively coupled plasma atomic emission spectrometry with microwave digestion
NI Wen-shan1,2, ZHANG Hong-li1,2, MAO Xiang-ju1,2
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
Abstract：The iron concentrate ore was dissolved with 8 mL of HCl and 2 mL of HF by microwave heating. The ferric irons were extracted with methyl isobutyl ketone in 6 mol/L HCl medium to eliminate the spectral interference of much iron on the determination of zirconium and hafnium. The Zr 339.198{99} nm and Hf 277.336{121} nm were selected as the analytical lines. The content of zirconium and hafnium in solution was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) under the selected instrumental parameters. The results showed that the atomic emission spectrum intensity of zirconium and hafnium exhibited good linearity to their contents (in the mass fraction of ZrO2 and HfO2) in range of 0-8.0 μg/mL. The correlation coefficients (r) of calibration curves were both 0.999 9. The detection limit of method was 0.025 and 0.024 μg/mL, respectively. The proposed method was applied to the analysis of actual sample of iron concentrate ore. The relative standard deviations (RSD, n=6) of determination results were 0.98%-2.7% and 1.5%-4.9%, respectively. The recoveries of standard addition were 94%-108% and 93%-110%, respectively.
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NI Wen-shan, ZHANG Hong-li, MAO Xiang-ju. Determination of zirconium and hafnium in iron concentrate ore by inductively coupled plasma atomic emission spectrometry with microwave digestion. , 2015, 35(8): 71-75.
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