FIELD: chemistry.
SUBSTANCE: aqueous solution of sulphoazo dye E110 is added with crystalline ammonium sulphate of solution concentration 43 wt %, extracted with solvent mixture of 1,4-dioxane in amount 60-77 wt % and 2-propanol in amount 40-23 wt % within 10 minutes. Volume ratio of solvents and aqueous solution of sulphoazo dye E110 is 1:10. Sulphoazo dye E110 content after extraction is evaluated with spectrophotometry. Extraction rate R is calculated by formula: R = (A-AP)*100 %/A, where A, Ap are optical densities of aqueous solution prior to extraction and thereafter respectively.
EFFECT: method improvement.
2 ex
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