FIELD: analytical methods. SUBSTANCE: indicator water-based composition for determining copper(II) in waste waters and production solutions contains 0.6% anionite AN-31 in sulfate form as sorbent, 0.05% 2-(2- pyridylazo)resorcin as reagent, and 0.098-0.1% of sulfuric acid providing required pH of medium. EFFECT: increased selectivity and rapidity of analysis. 2 tbl _
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