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在稀硫酸介质中及活化剂草酸存在下，痕量铁（Ⅲ）对结晶紫光化学褪色反应有强烈催化作用，结晶紫的光化学反应产物于－０．７０Ｖ产生一灵敏的２．５次微分极谱波．研究了利用此体系测定痕量铁的影响因素，建立了一个检出限和测定范围分别为２ｎｇ／ｍＬ和６～２００ｎｇ／ｍＬ铁的光化学伏安分析法，并用于茶叶中铁的测定．
Trace iron (Ⅲ) strongly catalyzed the chemical fading reaction of crystal violet in diluted sulfuric acid and activated oxalic acid. The photochemical reaction product of crystal violet produced a sensitive 2.5-order differential pole at -0.70V Spectrum wave. The influencing factors for the determination of trace iron using this system were studied. A photochemical voltammetric method was developed for the determination of trace iron in tea with a detection limit of 2ng / mL and a concentration range of 6 ~ 200ng / mL.