PVA－碘－草酸高灵敏显色反应的实验研究

A Rescarch on High Sensitive Color ation Reaction of PVA-Iodine-Oxalic Acid System

对ＰＶＡ与碘在草酸介质中的显色反应做了研究，发现在０．０２～０．１ｍｏｌ／Ｌ的草酸溶液中，ＰＶＡ与碘形成的配合物最大吸收峰在５９５ｎｍ波长处，表观摩尔吸光系数为５．６０×１０５，ＰＶＡ含量在０．００４～０．

The paper makes a study of color ation reaction of PVA and iodine in the presence of oxalic acid medium under the appropriate conditions. In a solution containing 0.02￣0.1 mol/L oxalic acid, the the maximum absorption peak of the compound formed with PVA and iodine is found at wave length being 595 nm, with mole absorption coefficient being 5.60×10 5. The content ranging from 0.004￣0.28 mg/ml conform to Beer Law.