FIELD: chemistry.
SUBSTANCE: method involves dissolving the analysed sample in purified water; holding on a water bath while stirring and at temperature of 30-40°C until complete dissolution; bringing the volume of the solution to the mark using the same solvent; successive treatment of an aliquot part of the obtained solution with 1% alkaline solution of sodium nitroprusside, 3% hydrogen peroxide solution and 0.1 M KOH solution and photoelectric colorimetry of the coloured solution.
EFFECT: high sensitivity, selectivity and accuracy of analysis.
1 ex, 9 dwg
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