Optimization of ultrasound-assisted magnetic retrieval-linked ionic liquid dispersive liquid–liquid microextraction for the determination of cadmium and lead in water samples by graphite furnace atomic absorption spectrometry

摘要: Abstract A simple and efficient method for the determination of Cd Pb in water samples was developed by ultrasound-assisted magnetic retrieval-linked ionic liquid dispersive liquid–liquid microextraction (UA-MR-IL-DLLME) preconcentration graphite furnace atomic absorption spectrometry (GFAAS) detection. Ionic (IL) [Hmim] [PF6] used as extractant, ammonium pyrrolidine dithiocarbamate (APDC) complexing agent Fe3O4 nanoparticles sorbent, while ultrasound applied to assist dispersion extractant accelerate mass transfer process. The effect different factors on extraction efficiency including pH, IL volume, APDC amount, time, desorption time amount studied a fractional factorial design screen most important factors. Then central composite optimize significant Under optimal conditions, has linear calibration curves over range 0.3–20 ng/mL 0.5–40 ng/mL Pb, with correlation coefficients (R) 0.9990 0.9986 respectively. limits detection were 0.1 ng/mL 0.15 ng/mL relative standard deviations 3.4% 2.8% Finally, successfully real satisfactory recoveries achieved.