title: Electrochemical quartz crystal microbalance characterization of I(-) and its amperometric detection by microelectrode.
abstract: The electrochemical redox mechanism of I(-) ion under different concentrations on gold electrodes was studied in detail using the EQCM technique (a combination of the QCM technique and cyclic voltammetry). The redox behavior of the I(-) ion on a gold microelectrode when no supporting electrolyte was added was compared with a conventional gold microelectrode. Due to the small current and the very low solution iR drop of the microelectrode, the actual oxidation potential of I(-) on the microelectrode was much more negative than that of the conventional electrode and its anodic peak was better defined. Therefore the gold microelectode was employed for the determination of I(-). A linear range of 1.0x10(-5)-0.1 mol l(-1) with a detection limit of 1.0x10(-6) mol l(-1) was obtained on the microelectrode in pure KI aqueous solution. Two samples were measured using this method and the results were in good agreement with those indicated or calculated..
authors.affiliation: Department of Chemistry, Wuhan University, Wuhan 430072, People's Republic of China.
authors.forename: W
authors.initials: W
authors.lastname: Zhang
authors.forename: H
authors.initials: H
authors.lastname: Zha
authors.forename: B
authors.initials: B
authors.lastname: Yao
authors.forename: C
authors.initials: C
authors.lastname: Zhang
authors.forename: X
authors.initials: X
authors.lastname: Zhou
authors.forename: S
authors.initials: S
authors.lastname: Zhong