Selective spectrophotometric determination of some primary amines in aqueous solution using tcne reagent

الملخص EN

A spectrophotometric method was developed for the quantitative determination of some primary amines, i.e.

EA, ethanolamine, aniline and aminophenol.

The method is based on the interaction between these amines and tetracyanoethylene (TCNE) reagent in the aqueous medium.

The spectra of the products show maximum absorption ranged between 325 and 344nm with molar absorptivities ranged from 2.831×103 to 1.3619×104 L.mol-1cm-1.

Beer’s law is obeyed in the concentration range of 0.2-7.2 µg / ml for ethylamine, aniline, m-aminophenol and 0.2-4.0 µg / ml for ethanolamine and the mean percent recoveries are ranged between 97.69% and 98.65 % and precision (RSD) is better than 7% for all the amines under study.

Also, it was found that the TCNE-amine products are formed in ratio of 1:1 and stability constants are ranged between 0.3×104 and 1.89×104 l.mol-1 for the studied amines.