The Use of 2,3-dichloro-1,4-naphthaquinone for the Spectrophotometric Determination of Some Primary Aliphatic Amines in Aqueous Solution

A simple and accurate spectrophotometric method was developed for the quantitative determination of some primary aliphatic amines in aqueous solution, i.e. ethanolamine, n-butylamine and n-hexylamine. The method is based on the interaction of these amines in aqueous medium with 2,3-dichloro-1,4-naphthaquinone (DClNQ) reagent in the presence of bicarbonate buffer solution to form an orange coloured products measurable at maximum wavelength of 475 nm. Beer's law is obeyed over the concentration range of 1-30, 5-20 and 3-30g/ml for