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以铕离子掺杂的类普鲁士蓝膜修饰铂电极作为工作电极,建立了用毛细管电泳-安培法测定甲醛次硫酸氢钠的方法。对一些影响测定的因素进行了优化。在优化的检测电位、电泳运行液的浓度及酸度、进样高压、进样时间等实验条件下,甲醛次硫酸氢钠的质量浓度约在7.5×10-2~7.5 mg/mL的范围内与其峰电流值呈良好的线性关系(R=0.9986),定量限为10μg/mL(S/N=10),平均加标回收率在98.7%~100.4%之间。方法可用于对食品面粉中添加的甲醛次硫酸氢钠进行质控检测。
The method of capillary electrophoresis with amperometric determination of sodium formaldehyde sulfoxylate was established by using a Prussian blue film modified platinum electrode doped with europium ion as the working electrode. Some of the factors that affect the assay are optimized. Under the optimal conditions of the detection potential, the concentration of electrophoresis running solution and acidity, the injection high pressure, the injection time and other experimental conditions, the mass concentration of formaldehyde sodium bisulfate is about 7.5 × 10-2 ~ 7.5 mg / mL, The peak current value showed a good linear relationship (R = 0.9986), the limit of quantification was 10μg / mL (S / N = 10), and the average recoveries ranged from 98.7% to 100.4%. The method can be used for quality control testing of formaldehyde sodium sulfoxylate added to food flour.