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在盐酸存在下 ,用对氨基苯磺酸与亚硝酸钠低温下进行重氮化反应 ,然后加入Na2 HPO4保持溶液的pH =1 .7～ 2 .0 ,再加入N -甲基苯胺 ,置于 60℃水浴中反应 80分钟生成红色化合物 .该化合物的最大吸收波长为 50 6nm ,当N -甲基苯胺的浓度为 0～ 8mg/L时 ,符合Lambert Beer定律 ,最低检出浓度为 0 .0 51 2mg/L 当甲苄胺的浓度小于 51 0mg/L ,苯胺的浓度小于 50mg/L时不干扰此反应 .
In the presence of hydrochloric acid, with sulfanilic acid and sodium nitrite at low temperatures for diazotization reaction, and then added Na2 HPO4 to maintain the solution pH = 1.7 ~ 2.0, then add N - methylaniline, placed 60 ℃ water bath for 80 minutes to generate a red compound.The maximum absorption wavelength of the compound is 50 6nm, when N-methylaniline concentration is 0 ~ 8mg / L, in line with Lambert Beer’s law, the minimum detectable concentration of 0 .0 51 2mg / L When the concentration of methylbenzylamine is less than 51 0mg / L, aniline concentration of less than 50mg / L does not interfere with this reaction.