In polyphosphoric acid (PPA) solution

a novel acidic potassium permanganate-galangin chemiluminescence system was studied. By means of chemiluminescence spectra

UV-Vis absorption spectra

fluorescence spectra and micro-potentiometric titration method

it was discovered that some experimental evidences for confirming the emission species of the system. The results indicated that the CL intensity of system reached maximum when the molar ratio of potassium permanganate to galangin was 6:5 and the CL intensity of system was proportional to galangin concentration within certain concentration extent when existing excessive oxidant. In addition

the fact that there exists mirror symmetry between electronic absorption spectra of permanganate ion and chemiluminescence spectra of the redox system showed that main luminophor of the chemiluminescence system certainly came from the reductive products of permanganate ion. The chemiluminescence kinetic results also indicated that along with the chemiluminescence reaction

the emission species was hardly the single species but could be converted into other species by the some dismutation process. On the grounds of experimental results

a possible reaction mechanism was also proposed

and it was confirmed likewise that the main emission species of the chemiluminescence redox system was more probably contributed of the excited Mn(Ⅱ) and Mn(Ⅲ) species produced by the redox system. Furthermore

the production of excited Mn(Ⅱ) by the active radical which came from galangin’s oxidative production was the main approaches for chemiluminescence reaction. The CL intensity of excited Mn(Ⅱ) had to be of linear relationship to galangin concentration

thus can be applied to quantitative analysis;but the production of excited Mn(Ⅲ) by the dismutation process would disturb the chemiluminescence behavior between the CL signal response and galangin concentration and not to be beneficial to chemiluminescence analysis.