Deep eutectic solvent containing 2-(3-hydroxy-1-methylbut-2-enylideneamino)pyridine-3-ol immobilized on magnetic graphene oxide as a selective sorbent for dispersive micro-solid phase extraction of cadmium ions

Abstract

A sorbent with high selectivity and capacity for cadmium ions was prepared through immobilization of deep eutectic solvent (DES) of ChCl- glycerol containing the ligand 2-(3-hydroxy-1-methylbut-2-enylideneamino)pyridine-3-ol (acacapyrH2) on the magnetic graphene oxide. A dispersive micro-solid phase extraction was designed, and the separated/preconcentrated cadmium ion was determined by flow injection flame atomic absorption spectrometry. After the optimization of effective parameters, the method showed linearity in the concentration range of 0.25–15 µg L−1 with the coefficient of determination (r2) of 0.9991 and enhancement factor of 195 for cadmium. The method was very sensitive with the detection limit (defined as 3Sb/m) of 0.06 µg L−1. The method was successfully applied to the determination of Cd(II) in water (drinking and river), fruit (lemon, apricot, and peach) and meat (fish, chicken, and cow meat) samples.