Add time:08/04/2019         Source:sciencedirect.com

Here, electrochemical determination of lead (Pb2+) and copper (Cu2+) ions, by using diethylenetriamine pentaacetic acid (DTPA) functionalized dopaminated Fe3O4 (Fe3O4/DA) magnetic nanoparticles, MNPs, (Fe3O4/DA/DTPA), is reported. First, step by step construction of Fe3O4/DA/DTPA was characterized and confirmed by spectroscopic methods. Then, a simple and new modified magnetic electrode was prepared by employing permanent magnet into a carbon paste electrode (MCPE) and collecting functionalized MNPs in each steps. The prepared modified electrodes, electrochemically characterized and further proofs was obtained in the presence of Fe(CN)6]3−/4− as a redox probe. Sensing ability of the modified electrodes toward two valet cations was evaluated by following striping voltammetry responses of pre-concentrated ions on top of them. The MCPE/Fe3O4/DA/DTPA electrode showed selective response to Pb2+ and Cu2+ ions. Consequently, the electrode response to Pb2+ and Cu2+ was evaluated as a function of solution pH, pre-concentration time, and ions concentrations. Finally, in optimized conditions, two linear ranges from 1.0 × 10−9 to 5.0 × 10−6 and 1.0 × 10−5 to 1.0 × 10−3 M Pb2+ with a detection limit (D.L.) of 7.8 × 10−10 M Pb2+, and a linear range from 5.0 × 10−9 to 1.0 × 10−3 M Cu2+ with a D.L. of 9.5 × 10−10 M Cu2+ were observed for separate determination of Pb2+ and Cu2+, respectively. Also, two linear ranges from 1.0 × 10−9 to 5.0 × 10−8 and 5.0 × 10−7 to 1.0 × 10−3 M Pb2+ with a D.L. of 8.2 × 10−9 M Pb2+, and a linear range from 5.0 × 10−9 to 1.0 × 10−4 M Cu2+ with a D.L. of 2.1 × 10−9 M Cu2+ were observed for simultaneous determination of Pb2+ and Cu2+. The obtained results will be presented and described here.

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