AROMATIC HYDROXYSULFONIC ACID IDENTIFICATION METHOD Russian patent published in 2005 - IPC

FIELD: analytical methods.

SUBSTANCE: method is recommended for identification of following aromatic hydroxysulfonic acids when analyzing azo dye production effluents: 2-naphthol-6-sulfonic acid, 1-naphthol-3,8-disulfonic acid, 2-naphthol-6,8-disulfonic acid, 1-amino-2-naphthol-4-sulfonic acid, 1-amino-8-naphthol-3,6-disulfonic acid, and 5-aminoculfosalicylic acid. Analytical procedure: ammonium sulfate is preliminary added to an aqueous solution until saturation and resulting solution is extracted with equimolar acetone-diacetone alcohol mixture at extractant-to-sample volume ratio 1:10. Extract is then analyzed with the aid of radial paper chromatography technique using as mobile phase acetone/diacetone alcohol/water mixture at volume ratio (0.9-1.1):(0.9-1.1):0.5.

EFFECT: enabled identification of different aromatic hydroxysulfonic acids when simultaneously present in solution.

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