Determination of free glyoxal in the resins by UV spectrophotometry

Standardization of the glyoxal solution was optimized based on the Cannizarro reaction mechanism.Based on the reaction of hydroxylamine and glyoxal to form glyoxime,the glyoxal content in the resin agent was determined at strong UV absorption 230 nm by UV spectrophotometry.The method showed a good linear relationship in the glyoxal concentration of 0.2～4.0 μg/mL with the correlation coefficient of 0.999 99(n=8).The detection limit of the method was 1.09 μg/mL and RSD was 0.162%,the recovery rate of the glyoxal was in the range of 95%～105%.