Polyaniline-functionalized magnetic graphene oxide for dispersive solid-phase extraction of Cr(VI) from environmental waters followed by graphite furnace atomic absorption spectrometry

摘要: The present work describes synthesis of polyaniline-coated magnetic graphene oxide (MGO@PANI) as an efficient anion-exchange sorbent for dispersive solid-phase extraction Cr(IV) from environmental samples. Graphite furnace atomic absorption spectrometry was used analysis the extracts. Synthesized nanoparticles were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and energy-dispersive X-ray analyzer. important variables on performance method such pH sample solution, amount, desorption time type, concentration volume elution thoroughly optimized means experimental design response surface methodology. Under condition, aliquot 50 mL (pH 5.6) extracted using 40 mg MGO@PANI during 20 min. Then, desorbed 850 µL 2.75 mol L−1 H2SO4 under fierce vortex 4.0 min. A preconcentration factor 40 recovery 68% provided proposed method. limit detection (3S/N) quantification obtained 5.0 15 ng L−1, respectively. showed a good linearity in range 15–300 ng L−1 with determination coefficient 0.9987. intra-day precision inter-day (RSD%) 5.3 8.2%, Finally, different water samples examined to indicate its real applicability results relative recoveries 100–110%.