FIELD: analytical methods. SUBSTANCE: title acids are determined in purified waste waters from pharmaceutical enterprises with preliminary liquid extraction and concentration of acids. Extraction is performed with ethyl acetate used in amounts from 5 to 100 cu.cm per 100 cu.cm of aqueous solution of acids. Extract is analyzed with the aid of potentiometric titration using dimethylsulfoxide as differentiating solvent at volume ratio to extract 1: 2.5. EFFECT: increased accuracy of potentiometric titration. 1 tbl, 8 ex
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