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An Amperometric Mercury Ions Sensor Constructed by Using Porous Tubular Iron Hydroxide Nanoparticles

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The porous tubular Fe(OH)3 nanoparticles were prepared by the Kirkendall-based fabrication route and characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Using porous tubular Fe(OH)3 nanoparticles modified glassy carbon electrode (GCE) as the working electrode, a very simple and highly sensitive mercury (II) sensor was constructed. The electrochemical behavior of mercury (II) on the developed sensor has been explored by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). A pair of well defined redox peaks (Epc = 0.241 V; Epa = 0.287 V) were observed in 0.10 M phosphate buffer solutions (pH 7.0). The prepared sensor showed a wide linear range from 1.0 × 10–9 M to 8.0 × 10–5 M (a correlation coefficient of 0.998) and a low detection limit of 3.0 × 10–10 M at a signal-to-noise ratio of 3. The acceptable reproducibility, long-term stability and anti-interference ability of the sensor were also assessed. Moreover, the method was successfully applied to the detection of mercury in real sample.
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Document Type: Research Article

Publication date: 2011-10-01

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