title: Electrochemical detection of bisphenol A mediated by [Ru(bpy)(3)](2+) on an ITO electrode.
abstract: A simple strategy for the direct and indirect detections of bisphenol A (BPA) at an ITO electrode is described. The direct determination of BPA in buffer solution of pH 7.2 is accomplished by the application of differential pulse voltammograms with the anodic peak at 0.546 V. The indirect approach is based on the mediation of [Ru(bpy)(3)](2+) (where bpy=2,2'-bipyridine), which is served as an excellent catalyst to induce the oxidation of BPA. By monitoring the peak current of [Ru(bpy)(3)](2+)-BPA complex, the mediated detection of BPA is successfully carried out. The response current exhibits a linear range between 5 and 120 micromol L(-1) with a high sensitivity (0.22 microA micromol(-1) L). The detection limit of BPA is 0.29 micromol L(-1) (S/N=3), which is larger than that analyzed by gas chromatography-mass spectrometry, however this detection method not only has the advantages of low cost and simple operation, but also provides a powerful basis for removing BPA. In addition, according to the effects of pH, scan rate and mediator concentrations on the voltammetric responses of BPA oxidation, the oxidized mechanism of BPA in the presence of [Ru(bpy)(3)](2+) on the ITO electrode is discussed in detail.
authors.affiliation: Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.forename: Gui-Fen
authors.initials: GF
authors.lastname: Du
authors.forename: Zheng-He
authors.initials: ZH
authors.lastname: Xu
mesh_terms: D001559:Benzhydryl Compounds; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D008401:Gas Chromatography-Mass Spectrometry; D010084:Oxidation-Reduction; D010636:Phenols / Q000032:analysis*; D017975:Ruthenium Compounds / Q000737:chemistry*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D010636:Phenols; D017975:Ruthenium Compounds; C006780:bisphenol A; D000098826:Bisphenol A Compounds