FIELD: analytical chemistry. SUBSTANCE: method involves concentration of analyzing substances with acetone in the presence of salting out agent - ammonium sulfate following by potentiometric titration of prepared extract in acetone with ethanol solution of potassium hydroxide. Acetone for extraction is taken at the ratio to analyzing sample (1.5-2):100, and salting out agent - 42-43 wt.- % related to the aqueous sample. EFFECT: improved method of analysis. 1 tbl
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