Ing, In, HaoXia
2013
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Abstract
Glyoxylic acid is an important intermediate extensively uses in the perfumery, pharmaceutical and fine chemical industries. Various industrial methods to produce glyoxylic acid have attracted the interest of many researchers. Among those methods, the electroreduction of oxalic acid to obtain glyoxylic acid has been suggested as one of the most acceptable technologies because it meets the increasing and stringent requirements for environmental protection. Because the oxalic acid and glyoxylic acid have the similar structures, it has difficulty to use classic chromatogram to analyze both of these substances qualitatively and quantitatively. Although many measurements have been applied to analyze these substances including spectrophotometry, titration with Cannizzaro reaction, chromatography and direct polarography methods, these techniques may have some kind disadvantages. For example, the accuracy of the titration method is easily influenced by many factors. For the spectrophotometry method, to obtain response signal, the reaction of 2,4-dimitrophenylhydrazine with glyoxylic acid must be carried out first, because the sample has a weak or no absorption in ultraviolet or visible light. These pretreatment experiments, which need a long time and complex operation, are both Determination of Glyoxylic Acid in Organic Electrosynthesis Using the Differential Pulse Polarography