Abstract
A novel magnetic graphene oxide nanocomposite was synthesized by one-step coprecipitation method and characterized by transmission electron microscopy, X-ray photoelectron spectroscopy and vibrating sample magnetometer. The nanocomposite beard many intriguing properties, including chemical stability, high adsorption capacity, and superparamagnetic. These properties evoked great interest and desire of its exploration in magnetic solid-phase extraction of heavy metal ions from complex samples. Several parameters effecting the analytical performance, such as the sample pH, amounts of adsorbent, sample volumes, elution volumes, and coexisting ions, had been investigated in detail. The adsorbed metal ions were easy eluted by controlling the pH condition and the materials could be reused more than 20 times. Under the optimized conditions, the limits of detection were 0.016, 0.046, 0.395, 0.038, 0.157μgL−1 for Co2+, Ni2+, Cu2+, Cd2+, and Pb2+, respectively. The intra-day relative standard deviations (n=5) were in the range of 1.8–5.5% at 10μgL−1. The proposed method was successfully applied to biological sample analysis and got excellent recoveries in the range of 81–113% even the matrix was complex.
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