التقدير الطيفي لأيزومرات امينوفينول بواسطة تفاعل الاقتران التأكسدي مع 4-امينوانتي بايرين

الملخص EN

A spectrophotometric method has been developed for the determination of aminophenol isomers (o-aminophenol, m-aminophenol and p-aminophenol).

The method is based on oxidative coupling reaction of these compounds with 4-aminoantipyrine (4-AAP) in the presence of cupper sulphate as oxidizing agent in alkaine medium forming a reddish brown colour.

The products show maximum orption at 440 nm, 480 nm and 445 nm for o-aminophenol, m-aminophenol and p-aminophenol respectively.

The molar orptivities are 8.632×103, 9.33×103 and 9.1449×103 l.

mol-1.

cm-1 for concentrations obeyed Beer's law in the range 1-20, 1-24 and 1-7 μg.

ml-1 for the above compounds respectively.

The average recovery was ranged between 98.38% and 101.01% with relative standard deviation < 1.6 for all the studied compounds.

The 4-AAP products were formed in the ratio of 1: 2 aminophenol isomers: 4-AAP.

The stability constant of the products was 7.4 ×108, 3.27×108 and 9.94×107 l2.

mol-2 for o-aminophenol, m-aminophenol and p-aminophenol products respectively indicating the good stability of these products