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Li Yao,Xie Wang,Haitao Liu,Chaowen Lin,Liangyu Pang,Junwei Yang,Qingbin Zeng 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-
A simple and efficient method for the determination of Cd and Pb in water samples was developed byultrasound-assisted magnetic retrieval-linked ionic liquid dispersive liquid–liquid microextraction (UA-MR-IL-DLLME) preconcentration and graphite furnace atomic absorption spectrometry (GFAAS)detection. Ionic liquid (IL) [Hmim] [PF6] was used as the extractant, ammonium pyrrolidinedithiocarbamate (APDC) as the complexing agent and Fe3O4 nanoparticles as the sorbent, whileultrasound was applied to assist the dispersion of the extractant and accelerate the mass transfer process. The effect of different factors on the extraction efficiency including pH, IL volume, APDC amount,ultrasound extraction time, ultrasound desorption time and Fe3O4 amount was studied by a fractionalfactorial design to screen for the most important factors. Then a central composite design was used tooptimize the significant factors. Under the optimal conditions, the method has linear calibration curvesover the range of 0.3–20 ng/mL for Cd and 0.5–40 ng/mL for Pb, with correlation coefficients (R) of0.9990 and 0.9986 for Cd and Pb, respectively. The limits of detection were 0.1 ng/mL and 0.15 ng/mL withrelative standard deviations of 3.4% and 2.8% for Cd and Pb, respectively. Finally, the method wassuccessfully applied for the determination of Cd and Pb in the real water samples and satisfactoryrecoveries were achieved.