Abstract
Based on the strong electrochemiluminescence (ECL) reaction between thiamazole and tris(2,2'-bipyridine)ruthenium(II) (Ru(bpy)3 (2+) ), a sensitive, simple and rapid flow injection analysis method for the determination of thiamazole was developed. When a Pt working electrode was maintained at a potential of +1.50 V (vs Ag/AgCl) in pH 12.0 H3 PO4 -NaOH solution containing thiamazole and Ru(bpy)3 (2+) at a flow rate of 1.0 mL/min, a linear range of 2.0 × 10(-7) -1.0 × 10(-4) mol/L with a detection limit of 5.0 × 10(-8) mol/L was obtained for the detection of thiamazole. The method showed good reproducibility with a relative standard deviation (RSD) of 0.75%. The method has been successfully applied to the determination of thiamazole in spiked animal feeds. In addition, a co-reactant ECL mechanism was proposed for the thiamazole-Ru(bpy)3 (2+) system.
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