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在盐酸与硫酸混合酸介质中，铟 (Ⅲ )对溴酸钾氧化甲基橙褪色的反应具有强烈的催化作用，而甲基橙在电极上还原产生灵敏的极谱吸附波，据此作为监测催化反应过程中甲基橙浓度的变化，建立了催化动力学极谱法测定痕量铟的新方法。该方法的线性范围为 20－ 400ng／ ml，检出限为 3.75ng／ ml。方法用于金属锌中铟的测定，结果令人满意。
In hydrochloric acid and sulfuric acid mixed acid medium, indium (Ⅲ) on potassium bromate oxidation of methyl orange fading reaction has a strong catalytic role, and methyl orange reduction in the electrode to produce sensitive polarographic adsorption wave, thus as a catalyst for monitoring the reaction Process of methyl orange concentration changes, the establishment of a catalytic kinetic polarographic determination of trace indium new method. The linear range of this method is 20-400ng / ml with the detection limit of 3.75ng / ml. The method was applied to the determination of indium in metallic zinc with satisfactory results.