Tanaka A, Nose N, Watanabe A.
J Chromatogr. 1980 Jun 6;194(1):21-31.1,2-Diaminobenzene reacts with nitrite in acidic solution to form 1H-benzotriazole, which can be extracted into ethyl acetate. After evaporation of the ethyl acetate, 1H-benzotriazole is determined as its trimethylsilyl derivative by gas--liquid chromatography on a column of 15% SE-30 on chromosorb G HP at 200 degrees C with flame-ionization detection. The nitrite concentration is calculated from the peak height. Read More