摘要
在稀硫酸介质中及活化剂草酸存在条件下，痕量铁（Ⅲ）对甲基紫光化学褪色慢反应有强烈催化作用，甲基紫的光化学产物于－０．７０Ｖ处产生一个２．５次微分极谱波。以该产物作指示组分，采用２．５次微分极谱检测技术，研究了利用此体系测定铁的影响因素，建立了一个检出限和测定范围分别为３μｇ／Ｌ和６～３００μｇ／Ｌ铁的光化学分析新方法。
Fe(Ⅲ) has strong effect on the photocatalytic oxidation of methyl violet in dilute sulfuric acid medium. The irradiation source was an UV lamp, and oxalic acid was used as the activator. The photochemicl oxidation product of methyl violet exhibits a 2.5 order differential palarographic wave at -0.70V vs. SCE. So this ware was chosen as an indicator for the oxidation reaction. On this ground, a novel photochemical-voltammetric method for the indirect determination of 6 ～ 300 μ g/L Fe in tea samples was established. The detection limit was 3 μ g/L Fe.
出处
《分析测试技术与仪器》
1996年第4期20-23,共4页
Analysis and Testing Technology and Instruments
关键词
光催化氧化
微分极谱法
铁
甲基紫
茶叶
Photocatalytic oxidation differential polarography Iron crystal violet tea lerf
