I_2—淀粉吸光光度法间接测定维生素C  

Indirect Determination of Vitamin Cby Spectrophotometry with Iodine-Starch System

作　　者：王丰[1] 李晓敏 伍军 

机构地区：[1]新疆伊犁师范学院化学系,伊宁835000 [2]新疆克拉玛依市白碱滩中学,克拉玛依834009

出　　处：《重庆师范大学学报（自然科学版）》1996年第S1期68-71,共4页Journal of Chongqing Normal University:Natural Science

摘　　要：根据在醋酸性介质中,Vc与I_2发生反应,剩余I_2与淀粉溶液生成蓝色物质,该物质在580nm处具有最大吸光值的原理,提出了间接测定Vc的新方法.在测定波长下,线性范围是0～5.28×10^(-3)g/L,检出限为7.5×10^(-9)kg/L.应用于饮料中Vc含量测定,结果满意.In HAc medium,Vc can react with I2 quantituively, the surplus I2 Can reaet withstarch to give a blue substance,which exhibits absorption peak at about 580nm. Therefore,anew method is developed for the determination of Vc,The absorption value is linear with Vcconcentration range of 0-5. 28 ×10 -3g/L .The method has been applied to the determinationof Vc in drinks with satisfactory results.

关 键 词：维生素C 吸光光度 间接测定 

分 类 号：O657.3[理学—分析化学]