甲基紫—铁(Ⅲ)—草酸体系的光化学伏安法研究  

Voltammetric Studies on the Photochemical System of Methyl Violet-Fe(Ⅲ)-oxalic Acid and its Application

作　　者：王盛棉 蒋治良[1,2] 

机构地区：[1]柳州市卫生学校 [2]广西师范大学计算分析测试中心

出　　处：《广西工学院学报》1998年第2期76-80,共5页Journal of Guangxi University of Technology

摘　　要：稀硫酸介质中，甲基紫于－０．５１伏处产生一灵敏的２．５次微分极谱波；当活化剂草酸存在条件下，痕量铁（Ⅲ）对甲基紫光化学褪色反应有强烈催化作用，甲基紫浓度的变化可采用２．５次微分极谱检测。据此，建立了一个测定０．０２～４μｇ／ｍｌ铁的光化学伏安分析新方法，并用于茶叶试样分析。おn diluted sulpuric acid medium,methyl violet exhibits a sensitive 2.5 order differential polarographic wave at -0.51v.In the presence of oxalic acid as activator,trace Fe(Ⅲ) has strongly catalytic effect on the photochemical reaction of methyl violet decolured.The changes in concentration of methyl violet can be monitored by the polarography.On those grounds,a new photochmical voltammetric method for the determination of 0.02-4 μg/ml Fe has been described and applied to analysis of iron in tea samples.

关 键 词：光化学伏安分析 甲基紫 铁 草酸 

分 类 号：O614.811[理学—无机化学] O657.3[理学—化学]