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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 5
BKCSDE 29(5)
May 20, 2008

Title	Electrochemical Behaviors of Hydroquinone on a Carbon Paste Electrode with Ionic Liquid as Binder
Author	Wei Sun*, Qiang Jiang, Maoxia Yang, Kui Jiao
Keywords	Hydroquinone, Ionic liquid, Carbon paste electrode, Electrochemistry, Cyclic voltammetry
Abstract	In this paper the electrochemical behaviors of hydroquinone (H₂Q) were investigated on a carbon paste electrode using room temperature ionic liquid N-butylpyridinium hexafluorophosphate (BPPF₆) as binder (ILCPE) and further applied to H₂Q determination. In pH 2.5 phosphate buffer solution (PBS), the electrochemical response of H2Q was greatly improved on the IL-CPE with a pair of well-defined quasi-reversible redox peaks appeared, which was attributed to the electrocatalytic activity of IL-CPE to the H₂Q. The redox peak potentials were located at 0.340 V (Epa) and 0.240 V (Epc) (vs. the saturated calomel electrode, SCE), respectively. The formal potential (E^0') was calculated as 0.290 V and the peak-to-peak separation (ΔE_p) was 0.100 V. The electrochemical parameters of H2Q on the IL-CPE were further calculated by cyclic voltammetry. Under the selected conditions the anodic peak current was linear with H₂Q concentration over the range from 5.0 × 10^?6 to 5.0 × 10^?3 mol L^?1 with the detection limit as 2.5 × 10^?6 mol L^?1 (3σ ) by cyclic voltammetry. The proposed method was successful applied to determination of H2Q content in a synthetic wastewater sample without the interferences of commonly coexisting substances.
Page	915 - 920
Full Text	PDF

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