Cathodic electrochemiluminescence behavior of norfloxacin/peroxydisulfate system in purely aqueous solution

A novel cathodic electrochemiluminescence (ECL) behavior of the norfloxacin (NFLX)/peroxydisulfate (S2O82−) system in purely aqueous solution at a glassy carbon electrode (GCE) was firstly reported in this paper. The NFLX/S2O82− system could produce a very strong ECL signal under the potential scan from 0 to −1.8 V in 0.1 M phosphate buffer solution (pH 7.0) containing 0.24 mg/mL NFLX and 10 mM S2O82−, which was about 350 times higher than that of S2O82− alone, while NFLX did not produce ECL in the absence of S2O82−. The effects of pH value, S2O82− and NFLX concentration on the ECL intensity were investigated and the possible mechanism for the ECL behavior of NFLX/S2O82− system was proposed.