Abstract
A glassy carbon electrode was modified with hydroxyapatite nanopowder (HA-NP) and characterized in terms of electrochemical oxidation of 4-nitrophenol (4-NP) via cyclic voltammetry, differential pulse voltammetry, chronoamperometry, and chronocoulumetry. The oxidation peak current of 4-NP at the modified electrode was increased (compared to the bare GCE), thus indicating that the HA-NP exhibits a remarkable enhancement effect on the electrochemical oxidation of 4-NP. The effects of loading with HA-NP, pH value, scan rate and accumulation time were examined. The oxidation peak current of 4-NP is proportional to its concentration in the range from 1.0 μM to 300 μM, with a correlation coefficient of 0.9996. The detection limit is 0.6 μM (at an S/N = 3). The method is simple, selective and sensitive. It was successfully applied to the determination of 4-NP in water samples, with recoveries ranging from 96% to 104%.
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This work was supported by the National Natural Science Foundation of China (No.20775044) and the Natural Science Foundation of Shandong province, China (Y2006B20).
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Yin, H., Zhou, Y., Ai, S. et al. Electrochemical oxidative determination of 4-nitrophenol based on a glassy carbon electrode modified with a hydroxyapatite nanopowder. Microchim Acta 169, 87–92 (2010). https://doi.org/10.1007/s00604-010-0309-1
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DOI: https://doi.org/10.1007/s00604-010-0309-1