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在稀硫酸介质及加热下，痕量ＮＯ~－_２对ＢｒＯ~－_３氧化橙黄Ⅳ反应具有强烈催化作用；在０．１０ｍｏｌ／ＬＮａＯＨ介质中，橙黄Ⅳ于－０．５０Ｖ处产生一灵敏的示波极谐波。据此建立了一个检出限和测定范围分别为０．０２７ｎｇ／ｍＬ和０．０８～２０ｎｇ／ｍＬＮＯ~－_２的催化反应—示波极谱分析新方法。
Under dilute sulfuric acid medium and heating, the trace amount of NO ~-2 has a strong catalytic effect on the reaction of BrO ~ -_3 orange yellow orange Ⅳ; in the medium of 0.10mol / L NaOH, the yellow orange Ⅳ produces a sensitive at -0.50V Very harmonic wave. A new method of catalytic reaction-oscillopolarographic analysis with detection limit of 0.027 ng / mL and 0.08 ~ 20 ng / mL NO ~ -_2 was established.