FIELD: analytic chemistry. SUBSTANCE: method is based on preliminary hydrolysis of pyridilmaleinamidoacid with subsequent photometering of solution obtained. Water solution of pyridilmaleinamidoacid is treated with 6M solution of acetic acid, and optical density of obtained solution is measured immediately at characteristic wavelength of absorption of 2-aminopyridin which is one of products of pyridilmaleinamidoacid hydrolysis. EFFECT: reduced time of determination. 2 ex, 4 tbl
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