Quenching of the electro-chemiluminescence of the ruthenium complex was applied for detection of NO at the flow injection apparatus equipped with a homemade gas pressure pump with low noise and a flow-through electrogenerated chemiluminescence (ECL) cell. NO quenched the ECL emission of Ru(bpy) 3 2þ at the potential of the oxidation of Ru(bpy) 3 2þ efficiently to set the detection limit of NO at 0.1% of concentration of Ru(bpy) 3 2þ . The decrease in ECL intensity is linearly dependent on the logarithmic concentration of NO in the range of 5.7 Â 10 À7 M to 1.8 Â 10 À5 M. Voltammetric and spectrometric analysis showed that NO was not coordinated to Ru(bpy) 3 2þ/3þ , but catalyzed the quenching reaction.
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