METHOD OF SEPARATELY DETERMINING MONOAMINOBENZOIC ACIDS IN WATER

摘要

FIELD: analytical methods. SUBSTANCE: method consisting of extraction followed by properly determination procedure is distinguished by that, before determining acids, extraction concentration is performed using 5-20 cu. cm of isopropyl alcohol in presence of lithium sulfate as salting-out agent taken in amount 20-25% of the weight of sample, extract is divided into two portions and monoaminobenzoic acids are determined by conductometric titration technique. In the first extract portion, m-aminobenzoic acid is titrated by solution of KOH in isopropyl alcohol and, in the second portion, o-aminobenzoic acid is titrated by solution of cuprous chloride KOH in isopropyl alcohol. p-Aminobenzoic acid concentration is calculated from data of alkalimetric and complexonometric titrations. EFFECT: increased analysis accuracy. 1 dwg, 1 tbl