Abstract
A method was proposed for the determination of an unknown nonionic surfactant; the method consists in the combination of two group methods: potentiometric titration with sodium tetraphenylborate (TPB) and UV spectrophotometry with the use of a common reference material. This allows the identification and quantitative determination of a nonionic surfactant without data on its molecular mass and the stoichiometry of its binding with TPB. The proposed method has less limitation than the use of only one method for the determination of the hydrophilic or hydrophobic fragment of the nonionic surfactant, which is used for the elucidation of the number of ethoxy groups in surfactant samples. The main performance characteristics of the procedures were estimated. Examples of the analysis of model and real materials, detergent solutions, and waste waters are given.
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Original Russian Text © V.V. Kokovkin, S.A. Savintseva, L.G. Lavrenova, 2008, published in Zhurnal Analiticheskoi Khimii, 2008, Vol. 63, No. 4, pp. 354–362.
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Kokovkin, V.V., Savintseva, S.A. & Lavrenova, L.G. Determination of ethoxylated surfactants by functional fragments using group methods of analysis with a common reference compound. J Anal Chem 63, 320–328 (2008). https://doi.org/10.1134/S1061934808040035
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DOI: https://doi.org/10.1134/S1061934808040035