| 摘要 |
There are disclosed buffered compositions for detecting either hydrogen peroxide or a substance having peroxidative activity by the catalytic oxidation of a dye-providing material by hydrogen peroxide in the presence of the material having peroxidative activity, which compositions comprise (A) hydrogen peroxide or substance having peroxidative activity, as appropriate, and (B) as the dye-providing material, either (I) a mixture of (A) EITHER A SULFONYL HYDRAZONE OF THE FORMULA <IMAGE> or a sulfonyl hydrazone precursor of the formula <IMAGE> wherein R = alkyl R' = hydrogen, aryl, alkoxy, halogen or alkyl R'' = aryl or alkyl Z = atoms necessary to complete a heterocyclic ring of 5-6 atoms in the ring nucleus M(-) = AN ANION; AND (B) A COUPLER OR (II) a triarylimidazole of the formula <IMAGE> wherein R1, R2 and R3 are each an organic group such that at least one of R1, R2 and R3 is an ortho or para hydroxy substituted aryl group of up to 18 carbon atoms; the other two R1, R2 and R3 being chosen such that the oxidation potential of the imidazole lies between -70 mV to +110 mV measured by cyclic voltometry against a standard calomel electrode using a carbon based electrode. |
