Abstract：After the extraction with ［Bmim］ BF4 ionic liquid-NaH2PO4 aqueous two-phase extraction system, iron in iron tailing samples was determined by flame atomic absorption spectrometry. Effects of the factors like salt consumption, temperature and pH on the extraction rate were investigated. The results showed that the opitimal condition for the extraction of iron ions with the ionic liquid aqueous two-phase system at pH 6.0 was as follows:［Bmim］BF4 ionic liquid of 1.5 mL, NaH2PO4·2H2O of 3.5 g, phenanthroline solution of 2.0 mL and reaction temperature of 70 ℃. The linear range of this method was 0.002-60 μg/mL. The calibration curve equation was A=0.104 5ρ+0.0165 2 with correlation coefficient of 0.999 8. The detection limit was 0.008 9 μg/mL, and the recoveries were 95%-98%. This method was used for real sample analysis, and the results were consistent with those obtained by inductive coupling plasma atomic emission spectrometry with relative standard deviation (RSD, n=6) of 4.2%-4.5%. The ionic liquids after use was recovered by NaOH treatment, and it was found that its IR spectrum was basically the same as that before use, indicating that the recovered ionic liquid could be reused.
马毅红，蒙兰粉，尹艺青 . 离子液体双水相体系分离-火焰原子吸收光谱法测定铁尾矿中铁[J]. 冶金分析, 2012, 32(9): 36-39.
MA Yi-hong, MENG Lan-fen, YIN Yi-qing. Determination of iron in iron tailings by ionic liquid aqueous two- phase system separation-flame atomic absorption spectrometry. , 2012, 32(9): 36-39.
［2］ Daniel Tao, Steven Chen, Balvant K Parekh, et al. An investigation of a thermochemical process for conversion of gypsum and pyrite wastes into useful products［J］. Advances in Environmental Research，2001, 5(3): 277-283.
［3］ 陈禄政, 熊大和. 采用连续离心分离技术回收细铁尾矿中铁［J］. 自然科学学报（Journal of Natural Science）, 2008, 39（6）:1258-1261.
［8］ María José Ruiz-ngel, María Celia García-lvarez-Coque. Prediction of peak shape in hydro-organic and micellar-organic liquid chromatography as a function of mobile phase composition［J］. Journal Chromatography A, 2007, 1163(1-2): 119-127.
［9］ Zhuo Du, Yong-Liang Yu, Jian-Hua Wang . Extraction of proteins from biological fluids by use of an ionic liquid/aqueous two-phase system［J］. Chemistry European Journal, 2007, 13(7): 2130-2137.
