Ultraviolet spectrophotometric method for the determination of aromatic amines in chemical industry waste waters

Abstract

An analytical method was developed for the determination of aromatic amines occurring in coal processing products. The method involves the measurement of difference UV spectra whereby aqueous solutions of identical concentration but different pH are measured against each other. A detection limit of ca., 0.1-1 mg 1-1 (0.1-1 ppm) was achieved. The method is suitable for the determination of aniline and pyridine and their methyl derivatives, and quinoline and isoquinoline in aqueous solutions. The concentrations of individual components or specific groups, were evaluated from the values of peak absorbance (irrespective of the sign) and from the average absorbance for individual groups of compounds. The method was tested for standard mixtures and samples of the amines isolated from coke processing products. The method has potential for determinations in waste waters and industrial emuents where other analytical techniques (e.g., gas chromatography or titration in nonaqueous media) prove difficult.

Effective and selective removal of aromatic amines from water by Cu2+-treated chitosan/alumina nanocomposite

“…The concentration of the aromatic amines in the aqueous solutions was analyzed using UV spectrophotometry (Labudzin´ska and Gorczyn´ska, 1994;Pinheiro et al, 2004) at the wavelength of maximum absorbance (280-300 nm). Measurements were carried out by using a Shimadzu UV-1800 spectrophotometer.…”

Analytical Aspects of Amino, Quaternary Ammonium, Nitro, Nitroso and Related Functional Groups

“…Also, standard mixtures and samples of the amines isolated from coke processing products were tested; LOD 0.1 1 ppm. The procedure is potentially useful for waste waters and industrial effluents, where techniques such as GC and nonaqueous titrations may prove difficult to apply 333 consists of basic hydrolysis of urine, followed by spectrofluorimetric determination of p-aminobenzoic acid and p-aminosalicylic acid 334 .…”

Analysis of Some Aromatic Amines by Means of Derivative Spectrophotometry

“…Isomers of one compound may have different levels of toxicity. Various spectrophotometric methods were used for determination of aromatic amines, e.g., difference spectrophotometry [8] or determination in the form of complexes with Fe(III). Phenylenediamines, found in most permanent hair dyes often act as allergens causing dermatitis and exhibit mutagenic activity.…”