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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，并用于茶叶分析
Trace iron (Ⅲ) strongly catalyzed the reaction of methyl violet photochromism in dilute sulfuric acid medium and oxalic acid in the presence of activator. The photochemical products of methyl violet produced a 2.5 times at -0.70V Differential polarographic wave. Using this product as indicator component, 2.5-fold differential polarographic detection technique was used to study the influence factors of iron determination by this system. A detection limit and determination range of 3μg / L and 6 ~ 300μg / L New methods of photochemical analysis of iron, and for tea analysis