METHOD OF QUANTITATIVE DETERMINATION OF ANILINE AND ITS MONONITRO-DERIVATIVES Russian patent published in 1994 - IPC

FIELD: analytical chemistry. SUBSTANCE: citrate buffer is added to analyzed specimen up to pH 2.0-4.0 following by addition of p-dimethylcinnamic aldehyde (up to concentration 4.56 x 4,56·10^-5-4,56·10^-4 M - 4.56 x 4,0·10^-3-4,0·10^-2 M M). Under these conditions aniline, p-nitroaniline and m-nitroaniline form colored showing high extinction coefficient at 540-570 nm. Concentration of every analyzed compound in the mixture with o-nitroaniline is measured on the basis of optical density value of solution at maximum wavelength using calibration plot. Method ensures to determine aniline, p-nitroaniline or m-nitroaniline selectivity in the mixture with o-nitroaniline. EFFECT: improved method of assay. 2 tbl