FIELD: analytical chemistry. SUBSTANCE: analyzed sample is dissolved in diluted sulfuric acid, treated with 10% solution of potassium nitrate in concentrated sulfuric acid at the volume ratio of analyzed solution and reagent (0.5-2.0):0.5. Then sodium hydroxide solution is added to reaction mixture up to pH 9-14, and colored solution formed is subjected for photometry. EFFECT: improved method of assay. 3 tbl
Authors
Dates
1994-08-15—Published
1992-03-02—Filed