FIELD: sewage analytical chemistry. SUBSTANCE: analyzed sample is treated with a mixture of ammonium thiocyanate and ferric ammonium sulfate in acid medium. Then methylene chloride is added as an extractant, organic phase is separated, and extract is subjected for photometry. Concentration of nonionogenic surface-active substances is measured by preliminary prepared calibrating plot. Method is express and non-toxic. EFFECT: improved method of assay. 1 tbl
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