FIELD: analytical chemistry. SUBSTANCE: method involves the treatment of solutions with oxidative-reductive system on the basis of cerium salts at pH from 0.75 to 1.08 followed by change indication in the system and measurement of lignosulfonic acids content based on the indication result. Indication is carried out by potentiometry method. Analysis is carried out at the ratio Ce4+ : Ce3+ = 70/1 - 110/1 at concentration of oxidizing form 0.004-0.050 M. Method is used in cellulose and paper industry. EFFECT: improved method of assay. 4 tbl
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