Abstract: By contriving a novel electrolytic flowthrough cell, BrO^-, an unstable reagent, had been online produced with galvanostatic electrolysis method and flowinjection technique in alkaline KBr solution. The concentration of BrO^-can be online adjusted by this flow system. At the same time, it was found that sulfide had a strong enhanced effect on the emission intensity of CLreaction between BrO^-and LuminoLIn pH=9.60 Na₂CO₃NaHCO₃medium. Based on this observation, a new flowinjection analysis ECL method for the determination of sulfide ion has been proposed in this paper. The detection limit of sulfide ions was 0.100 mol/L, the linear range of determination sulfide ions was 0.310-93.0 mol/L with the relative standard deviation of 2%[c(S^2-)=3.10mol/L, n=11].

Key words: Electrogenerated chemiluminescence, Flowinjection analysis, Sulfide ion determination, Electrogenerated hypobromite, Luminol