METHOD OF DETERMINATION OF THE DIHYDROXYBENZENES IN THE WATER SOLUTIONS Russian patent published in 2008 - IPC G01N30/02 

FIELD: chemical industry; paint and varnish industry; photographic industry; methods of detection of the dihydroxybenzenes in the water solutions.

SUBSTANCE: the invention presents the method of control over the content of the dihydroxybenzenes in the purified waste waters of the enterprises of the paint and varnish industry and photographic industry. The method provides for detection and determination of the dihydroxybenzenes in the water solutions by the method of the reversed-phase microbore column highly effective liquid chromatography with the preliminary stage of the extractive concentrating at рН 2-3. At that the extractive concentrating of the dihydroxybenzenes is exercised by acetonitrile at the ratio of the equilibrium volumes of the water and organic phases 100:2 at the presence of the salting-out agent of the ammonium sulfate in amount of 36.5-40.0 mass % with respect to the mass of the sampling. The method ensures the increased degree of concentrating, reduction of the detection limits, the decreased consumption of the extractive reactants and the net cost of the analysis.

EFFECT: the invention ensures the increased degree of the concentrating, reduction of the detection limits, the decreased consumption of the extractive reactants and the net cost of the analysis.

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