重氮盐类的含量测定在印染工业方面,有其重要的意义和作用。作者试用极谱法,分析印染工业上常用的偶氮染料——凡拉明蓝B盐以求得一个简单迅速的分析方法。凡拉明蓝B盐的第一半波电位在0.1V(对S.C.E.)左右,不同的浓度对於波高影响不大,因此不适宜於测求定量之用。它的第二半波电位与波高随溶液酸度和浓度的改变而异,溶液pH值增高,第二半波电位负值增加,波高降 Diazonium content determination in the printing and dyeing industry, has its important significance and role. The author tries polarographic method to analyze the azo dye in the printing and dyeing industry - Van Laven Blue B salt in order to obtain a simple and quick analysis method. The first half-wave potentials of the Flavan Blue B salts are around 0.1 V (vs. S.C.E.), and the different concentrations have little effect on the wave height and are therefore not suitable for quantitative purposes. Its second half-wave potential and wave height vary with the acidity and concentration of the solution, the solution pH increases, the second half-wave potential increases negative, wave height