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根据实验得出的乙二醛、乙醛酸、草酸三组分混合物中各组分在特定波长下呈现出的良好的线性关系,建立起三组分质量浓度与混合吸光度的回归方程组,形成了多波长线性回归-矩阵法,实现了乙二醛氧化制备乙醛酸体系中反应产物乙二醛、乙醛酸、草酸含量的同时测定。研究结果表明:当乙二醛检测下限为1.024 mg/L时,回收率为94%～98%;乙醛酸检测下限为1.7 mg/L时,回收率为93.3%～96.8%;草酸检测下限为3.99 mg/L时,回收率为96%～103%。
According to the experiment, the glyoxal, glyoxylate, oxalic acid mixture of three components showed a good linear relationship at a specific wavelength, the establishment of three-component mass concentration and mixed absorbance of the regression equation to form The multi-wavelength linear regression-matrix method was used to realize the simultaneous determination of glyoxal, glyoxylate and oxalic acid in the glyoxylate glyoxylate system. The results showed that when the lower limit of glyoxal detection was 1.024 mg / L, the recovery was 94% -98%, the recovery was 93.3% -96.8% when the detection limit of glyoxylate was 1.7 mg / L, and the lower limit of oxalic acid detection For 3.99 mg / L, the recovery rate was 96% ~ 103%.