Taranu B.-O.,National Institute Of Res Development For Electrochem And Condensed Matter Timisoara Romania |
Vlaia V.,Victor Babes University of Medicine and Pharmacy Timisoara |
Stefanut M.-N.,National Institute Of Res Development For Electrochem And Condensed Matter Timisoara Romania |
Vlatanescu V.N.,National Institute Of Res Development For Electrochem And Condensed Matter Timisoara Romania |
And 2 more authors.
Environmental Engineering and Management Journal | Year: 2010
Previous studies have shown that pyrazine-2,3-dicarboxylic acid (PDCA) can be obtained through quinoxaline (Q) oxidation with electrochemically regenerated KMnO4 using Pt, Ni, stainless steel, Cu, brass and bronze electrodes. This corresponds to a smaller oxidant consumption as compared to the chemical oxidation reaction, a smaller energy consumption, an increase in the PDCA manufacturing efficiency and a significantly smaller impact on the environment due to secondary products removal (both from Q oxidation as well as from KMnO4 production). This paper presents the analysis methods used for the quantitative determination of PDCA obtained through Q oxidation (such as conductometric titration, UV-VIS and IR spectrophotometry) as well as those used for monitoring Mn7+ and Mn6+ concentrations (UV-VIS spectrophotometry and the visual method). The right conditions for applying these methods were established in order to properly evaluate the electrochemical process.