Diphenyl diselenide grafted onto aFe(3)O(4)-chitosan composite as a new nanosorbent for separation of metal ions by effervescent salt-assisted dispersive magnetic micro solid-phase extraction

Diphenyl diselenide was immobilized on chitosan loaded with magnetite (Fe3O4) nanoparticles to give an efficient and cost-effective nanosorbent for the preconcentration of Pb(II), Cd(II), Ni(II) and Cu(II) ions by using effervescent salt-assisted dispersive magnetic micro solid-phase extraction (EA-DM-SPE). The metal ions were desorbed fromthe sorbent with 3M nitric acidand then quantified via microflame AAS. The main parameters affecting the extraction were optimized using a one-at-a-time method. Under optimum condition, the limits of detection, linear dynamic ranges, and relative standard deviations (for n=3) are as following: Pb(II): 2.0ngmL(-1); 6.3-900ngmL(-1); 1.5%. Cd(II): 0.15ngmL(-1); 0.7-85ngmL(-1), 3.2%; Ni(II): 1.6ngmL(-1),.6.0-600. ngmL(-1), 4.1%; Cu(II): 1.2ngmL(-1), 3.0-300ngmL(-1), 2.2%. The nanosorbent can be reused at least 4 times.