ULTRAVIOLET SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF AROMATIC-AMINES IN CHEMICAL-INDUSTRY WASTE-WATERS

An analytical method was developed for the determination of aromatic a mines occurring in coal processing products. The method involves the m easurement of difference UV spectra whereby aqueous solutions of ident ical concentration but different pH are measured against each other. A detection limit of ca., 0.1-1 mg l(-1) (0.1-1 ppm) was achieved. The method is suitable for the determination of aniline and pyridine acid their methyl derivatives, and quinoline and isoquinoline in aqueous so lutions. The concentrations of individual components or specific group s, were evaluated from the values of peak absorbance (irrespective of the sign) and from the average absorbance for individual groups of com pounds. The method was tested for standard mixtures and samples of the amines isolated from coke processing products. The method has potenti al for determinations in waste waters and industrial effluents where o ther analytical techniques (e.g., gas chromatography or titration in n onaqueous media) prove difficult.