Cathodic electrochemiluminescence behavior of Eosin B and its quenching mechanism by Cr3+

A novel electrochemiluminescence (ECL) system consisting of Eosin B (EB) and K 2 S 2 O 8 was studied and found to generate ECL following the oxidation or reduction of Eosin B and K 2 S 2 O 8 . The type of buffer solution, type of co-reactant, pH value, and K 2 S 2 O 8 concentration were optimized through experiments to make the reaction system reach the best value. In addition, we found that Cr 3+ has a great quenching effect on the EB reaction system. Through the comparison of ECL and CV under different conditions, DPV curve, UV spectrum and ECL spectrum experiments, we focused on the quenching mechanism of Cr 3+ on the system and made reasonable guesses. This method demonstrates the potential application value of ECL in the field of environmental monitoring and reveals the potential value of organic molecular ECL luminophores.