عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In this study, magnetic nanoparticles modified with DABCO-PDO ionic liquid were used to preconcentration and determination of trace amount of Pb(II) in aqueous samples using a flame atomic absorption instrument. Experimental factors affecting Pb(II) extraction and preconcentration were investigated and optimized. The calibration curve for Pb(II) was linear under the optimum condition in the concentration range of 0.8-1.6 µg l-1 with the determination coefficient of 0.9986. The concentration factor of Pb(II) was 100 with the detection limit of 0.25 µg l-1. The relative standard deviations (RSD %) for the concentration of the method were 1.8 and 2.5, respectively, with 4 successive replications in one day and between days. Lead determination was successfully applied for aqueous samples (rainwater in Tehran, tap water in Shahrak Gharb, Tehran, and mineral water). Recoveries in the ranges 90.6-97.8 was reported. Structure and morphology of the synthesized nanosorbent were investigated by using Fourier transform infrared spectroscopy (FTIR) analysis, scanning electron microscopy (SEM), and X-ray powder diffraction (XRD).