Simultaneous determination of the amounts of glyoxal,glyoxylic acid and oxalic acid by multi-wave lengh linear regression-matrix method

According to the experimental results,in three components glyoxal,glyoxylic acid and oxalic acid in the mixture presented the good linear relationship at the specific wave length.The regression equations between mass concentrations of the three components and the mixed absorbances were established;the multi-wave length linear regression-matrix method was formed;the simultaneous determination of the amounts of glyoxal,glyoxylic acid and oxalic acid from the product which glyoxal was oxidized to glyoxylic acid was accomplished.The results suggested that the detection limit of the glyoxal concentration was 1.024 mg/L,and the recoveries were in the range of 94%～98%.The detection limit of the glyoxylic acid concentration was 1.73 mg/L,and the recoveries were in the range of 93.3%～96.8%.The detection limit of the oxalic acid concentration was 3.99 mg/L,and the recoveries were 96%～103%.