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基于在酸性条件下，铁对溴酸钾氧化酸性铬蓝Ｋ反应的催化作用，利用极谱仪器作为监测手段，测定酸性铬蓝Ｋ在０．０８ｍｏｌ／ＬＮＨ３Ｈ２Ｏ～０．０１ｍｏｌ／Ｌ（ＮＨ４）２ＳＯ４介质中的极谱波，建立了催化动力学极谱法测定痕量铁的新方法．方法的线性范围为１０～１００ｎｇ／ｍＬ，检出限为０．１５ｎｇ／ｍＬ，应用于天然水及食品中铁的测定，结果满意．
Based on the catalytic effect of iron on the oxidation of acid chrome blue K by potassium bromate under acidic conditions, the acidity of chrome blue K in 0.08mol / L NH3H2O ~ 0.01mol / L (NH4) 2SO4 was measured using a polarographic instrument as the monitoring method. Polarographic wave, a new method for the determination of trace iron by catalytic kinetic polarography was established. The linear range of the method was 10 ~ 100ng / mL with the detection limit of 0.15ng / mL. The method was applied to the determination of iron in natural water and food with satisfactory results.