FIELD: analytical methods. SUBSTANCE: invention concerns analyzing recycled water in water rotation systems. After treatment of test water sample containing from 0.01 to 0.4 mg of zinc ions with thiosulfate and then with solution of dithizone in carbon tetrachloride, zinc dithizonate-containing organic layer is separated and zinc ions are transferred into 0.20- 0.25 M HCl solution taken in (1.0-0.8):1 volume proportion. Aqueous layer is separated and neutralized to pH 3-4 with ammonia solution, after which zinc ions are titrated with Trilon B in ethanol(acetone)- water (from 1:1 to 0.8: 1) medium in presence of ammonia buffer solution (pH 4.0 ± 0.2) and ethanol solution of dithizone. EFFECT: simplified and speeded up analysis. 4 ex
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