FIELD: analytic chemistry, namely, spectrophotometric determination of diphenylaminochloroarsine. SUBSTANCE: 2.0 ± 0.2 % solution of aromatic amine in dipolar solvent and mixture of 30 + 1 % hydroxide peroxide with 0.0020 + 0.0002 N sodium or potassium hydroxide are added into sample. Volume ratio of solution of hydrogen peroxide and solution of alkali during mixing is 2: 1, and volume ratio solution of sample, aromatic amine and said mixture being 25:1:1, respectively. O-toluidene is preferably used as mentioned above aromatic amine, acetone being used as aprotic solvent. Colored product is analyzed with the help of spectrophotometry at 430 + 2 nm. EFFECT: improved sensitivity, increased accuracy. 2 cl, 3 tbl
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