Environmental analytical methods

Study on superoxide and hydroxyl radicals generated in indirectelectrochemical oxidation by chemiluminescenceand UV-Visible spectra

ZHANG Bo-Tao , ZHAO Li-Xia , LIN Jin-Ming


Received September 24, 2007,Revised November 29, 2007, Accepted , Available online

Volume 20,2008,Pages 1006-1011

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The generation and transformation of radicals on the cathode of indirect electrochemical oxidation were studied by chemiluminescence (CL) and UV-Visible spectra in the reactor with a salt bridge that connected the separated chambers. The CL intensity of 4 10??9 mol/L luminol on the cathode with bubbling oxygen was about seven times that of the intensity without it, which was because of the generation of reactive oxygen species (ROS). The existence of ROS, especially the generation of the superoxide radical, could be a rmed by the fact that the CL intensity of 4 10??9 mol/L 2-methyl-6-(4-methoxyphenyl)-3,7-dihydroimidazo[1,2-a]pyrazin-3-one with bubbling oxygen was about four times that of the intensity without it. However, there was no chemiluminescence on the anode under the same condition. The change in the UV-Visible spectra of nitro blue tetrazolium and N,N-dimethyl-4-nitrosoaniline at the cathode chamber a rmed the transformation from oxygen to superoxide and hydroxyl radicals. The mechanism of the superoxide and hydroxyl radical generation and transformation on the cathode was discussed with the help of the experimental results and relative references.

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