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在稀硫酸介质中，（Ⅲ）对溴酸钾氧化酸性铬深蓝的反应具有灵敏的催化作用，以此作为指示反应建立了催化光度法测定超痕量铁（Ⅲ）的新方法。方法检出限为１．４ｘ１０￣（－１０）ｇ／ｍＬ，线性范围为２～８０ｎｇ／ｍＬ，应用于自来水、大米及面粉中铁（Ⅲ）的测定，结果满意。
In the dilute sulfuric acid medium, (Ⅲ) has a sensitive catalytic effect on the oxidation of acidic chromium cyanate by potassium bromate. A catalytic spectrophotometric method for the determination of ultra-trace iron (Ⅲ) was established as an indicator reaction. The detection limit was 1.4x10 ~ (-10) g / mL and the linear range was 2 ~ 80 ng / mL. The method was applied to the determination of iron (Ⅲ) in tap water, rice and flour with satisfactory results.