(一)按Griess反应芳香族胺类的重氮化鹽,如对氨基苯磺醯胺类药物等,在酸性溶液中皆能与α-萘胺或二苯胺分别偶合成偶氮色素而显紅色,过多之亞硝酸可与氮色素再作用使紅色消失而呈棕黄色。二苯胺为較好的内指示剂。 (二)本法仅用于無色溶液。滴定至全量的三分之二以后加入指示剂較适宜。 (三)本反应宜在溴化鉀存在下进行。 (A) According to Griess reaction of aromatic amines diazotized salt, such as p-aminobenzenesulfonamide drugs, etc., in acidic solution can be coupled with alpha-naphthylamine or diphenylamine were azo dyes and red , Too much nitrite can be redone with the role of nitrogen and then disappear was brown. Diphenylamine is a better internal indicator. (B) This method is only for colorless solution. Titration to the full amount of two-thirds after the indicator is more appropriate. (C) The reaction should be carried out in the presence of potassium bromide.