Abstract
The effect of surfactants on reactions of primary aromatic amines with p-dimethylaminocinnamic aldehyde is studied. It is shown that the performance characteristics of the photometric determination of primary aromatic amines with p-dimethylaminocinnamic aldehyde can be substantially improved by using anionic surfactant micelles. On the basis of the observations, it is shown that anionic surfactants play a multiple role in the systems in study. Namely, surfactant anions select photometrically significant protonated quinoid forms of the condensation products of primary aromatic amines with p-dimethylaminocinnamic aldehyde (at a premicellar concentration) to form poorly soluble ion pairs. Next, anionic surfactant micelles dissolve them to form-intensely colored solutions that possess aggregative stability. Additionally, anionic surfactants increase the condensation rate. Procedures are developed for photometric and test determinations of aniline and its toxic and medicinal derivatives in the environmental samples, pharmaceutical formulations, and biological fluids. The procedures exhibit low detection limits; they are simple and precise.
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Translated from Zhurnal Analiticheskoi Khimii, Vol. 60, No. 5, 2005, pp. 471–478.
Original Russian Text Copyright © 2005 by Doronin, Chernova, Gusakova.
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Doronin, S.Y., Chernova, R.K. & Gusakova, N.N. Analytical Aspects of Reactions of Primary Aromatic Amines with p-Dimethylaminocinnamic Aldehyde in the Presence of Surfactant Ions and Micelles. J Anal Chem 60, 412–419 (2005). https://doi.org/10.1007/s10809-005-0111-0
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DOI: https://doi.org/10.1007/s10809-005-0111-0