库仑滴定法测定Vitamin C片及黄瓜、青椒中抗坏血酸的含量

Determination of Ascorbic Acid in Vitamin C Tablets and Green Pepper,Cuke by Coulometric Titration

建立了以1.0 mol.L-1碘化钾和1.0 mol.L-1醋酸混合液作为电解液的恒电流库仑滴定法测定抗坏血酸含量的方法。结果表明,方法的回收率在98.3%~100.8%之间,RSD在0.21%~0.56%(n=3)。该法可直接用于V itam in C片及黄瓜、青椒等样品中抗坏血酸含量的测定,方法简便灵敏,结果令人满意。

A coulometric titration method in a mixture electrolyte of 1.0 mol·L-1 KI+1.0 mol·L-1 HAc for the determination of ascorbic acid was established.The result showed that the average recovery of vitamin C was 98.3%~100.8%,with RSD of 0.21%~0.56%(n=3).The method has been used for the determination of ascorbic acid in Vitamin C tablets and the green peppers,cukes with satiafactory results.The advantages of this method are simple,rapid and accurate.