Study of the electrochemiluminescence based on tris(2,2′-bipyridyl)ruthenium(II) and some nervous amine compounds using flow injection analysis

A new electrochemiluminescence (ECL) method for the detection of methamphetamine (METH) and some nervous amine compounds is described. The pH of mobile phase and applied potential on glassy carbon electrode obviously influance the intensity of the ECL of METH. The mobile phase was selected as 0.1 mmpl/L Ru (bpy)(3)Cl-2 in 0.05 mol/L NaH2PO4-NaOH (pH 9.0) buffer. The studies of the effect of applied potential and flow rate on ECL showed that METH gives the brightest light emission at the potential of + 1.55 V and at the flow rate of 0.4 mL/min. A linear relationship was obtained from 6.84 x 10(-11) similar to 6.84 x 10(-3) mol/L with a correlation coefficient of R-2 = 0.9906 and the detection limit was 2 x 10(-1) mol/L under the experimental condition. We effect of surfactants on ECL was studied. The work also included the study of ECL of related compounds such as codeine, cocaine, morphine and so on. Cyclic voltammetry showed that their different oxidation currents might lead to their different ECL intensity. The method was simple, economical, sensitive, useful and provided some evidences for scout cases.