Analytical Sciences

Abstract − Analytical Sciences, 22(5), 697 (2006).

Self-Assembly of Molybdophosphate on a Glassy Carbon Electrode Covalently Modified with Choline and Electrocatalytic Reduction of Iodate
Xiangqin LIN and Chunming JIANG
Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
Choline can be covalently grafted on glassy carbon electrodes using cyclic voltammetric method, forming a stable cationic monolayer-modified electrode (Ch/GCE). Keggin-type molybdophosphate anions, α-PMo12O403-, then were self-assembled on the Ch/GCE through electrostatic interactions for fabrication of an electrochemical sensor, which is denoted as α-PMo12/Ch/GCE. This two-layer modified electrode was carefully characterized by cyclic voltammetry and X-ray photoelectron spectroscopy. It was found that the sensor exhibits strong electrocatalytic activity and sensitivity toward the reduction of IO3-. The content of IO3- in a table salt was determined with satisfactory results. The sensor is promising as an electrochemical sensor for the detection of IO3-.