FIELD: chemistry.
SUBSTANCE: method includes using a demixing extraction system - water-antipyrine-acid, wherein antipyrine and naphthalene 2-sulphonic acid are taken in molar ratio of 1:1, heated to melting point of 97°C, 10.0 ml of the analysed aqueous solution is added to 1 ml of the obtained melt of the organic salt antipyrinum naphthalene-2-sulphonate, intensely shaken and held until demixing into an upper aqueous phase and a lower organic phase and the lower organic phase is analysed for fluorescence intensity.
EFFECT: high sensitivity and reliability of analysis.
1 ex, 3 tbl, 5 dwg
