Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10559783 | Talanta | 2011 | 6 Pages |
Abstract
Inhibited Ru(bpy)32+ electrochemiluminescence by inorganic oxidants is investigated. Results showed that a number of inorganic oxidants can quench the ECL of Ru(bpy)32+/tri-n-propylamine (TPrA) system, and the logarithm of the decrease in ECL intensity (ÎI) was proportional to the logarithm of analyte concentrations. Based on which, a sensitive approach for detection of these inorganic oxidants was established, e.g. the log-log plots of ÎI versus the concentration of MnO4â, Cr2O72â and Fe(CN)63â are linear in the range of 1 Ã 10â7 to 3 Ã 10â4 M for MnO4â and Cr2O72â, and 1 Ã 10â7 to 1 Ã 10â4 M for Fe(CN)63â, with the limit of detection (LOD) of 8.0 Ã 10â8 M, 2 Ã 10â8 M, and 1 Ã 10â8 M, respectively. A series of experiments such as a comparison of the inhibitory effect of different compounds on Ru(bpy)32+/TPrA ECL, ECL emission spectra, UV-Vis absorption spectra etc. were investigated in order to discover how these inorganic analytes quench the ECL of Ru(bpy)32+/TPrA system. A mechanism based on consumption of TPrA intermediate (TPrA·) by inorganic oxidants was proposed.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Bin Qiu, Lingling Xue, Yanping Wu, Zhenyu Lin, Longhua Guo, Guonan Chen,