2,6-二氯靛酚滴定法是测定维生素C的标准方法。由于滴定终点呈粉红色使得该方法难以用于有颜色的或浑浊的样品,而且滴定法需要样品量大,需要过滤、耗时间。本文介绍一种水果、蔬菜、果汁中维生素C的简便、快速、准确的微量测定方法——点比法,该法可以对滴定法的缺陷给以改进。 (一) 制备试验纸 2,6-Dichloro-indophenol titration is the standard method for the determination of vitamin C. Due to the end point of the titration of pink makes the method difficult to use for the color or turbidity of the sample, and the titration method requires a large sample size, the need for filtration, time-consuming. This article describes a simple, rapid and accurate method for the determination of vitamin C in fruits, vegetables and juices - point-by-point method, which can improve the defects of titration. (A) Preparation of test paper