FIELD: chemistry.
SUBSTANCE: method involves dissolving an analysed sample in 0.1 M KOH solution, holding on a water bath while stirring at temperature 50-60°C until complete dissolution, bringing the volume of the solution to the mark using the same solvent; subsequent treatment of the aliquot part of the obtained solution with 0.1 M KOH solution, 5% alkaline solution of a chemical as a reducing agent and 3% alkaline solution of sodium nitroprusside in the presence of a universal buffer solution with pH 10. Determination is carried out via photoelectrocolorimetry of the coloured solution.
EFFECT: high sensitivity, selectivity and accuracy of determining medicinal substances in pharmacopoeial preparations.
3 dwg, 3 tbl, 1 ex
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