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在硫酸介质中，以酒石酸为活化剂，痕量机对溴酸钾氧化乙基极的反应具有极强的催化作用，研究了最佳反应条件，且发现在氨性缓冲溶液中乙基橙及其氧化产物具有良好的极谱峰，以极谱法监测催化反应过程中乙基橙及其氧化产物浓度的变化，建立了催化动力学极谱法测定痕量帆的新方法。方法的线性范围为０．２５～３．５μｇ／Ｌ，检出限为０．１２μｇ／Ｌ。应用于食品中痕量钒的测定，结果满意。
In sulfuric acid medium, with tartaric acid as activator, trace amount of potassium bromate oxidation of ethyl radical reaction has a strong catalytic effect of the best reaction conditions, and found in ammonia buffer solution of ethyl orange and its oxidation The product has a good polarographic peak, and the change of concentration of ethyl orange and its oxidation product during the catalytic reaction was monitored by polarography. A new method for the determination of trace sails by polarography with catalytic kinetic was established. The linear range of the method was 0.25 ~ 3.5μg / L with the detection limit of 0.12μg / L. Used in the determination of trace amounts of vanadium in food, with satisfactory results.