IMPEDIMETRIC DETERMINATION OF CATION SURFACTANTS BY TITRATION METHOD
The method of impedimetric determination of cationic surfactants in water and water-organic emulsions in the presence of mineral salts, polyacrylamide, and oil has been developed. The conditions of obtaining impedimetric titration curves are optimized; metrological characteristics of the analysis methodology using the Student’s distribution and the method of principal components are estimated. It is shown that the proposed method of impedimetric titration can be used to analyze surfactants in solutions and organic mixtures with high mineralization and in the presence of high-molecular compounds. Using the proposed approach, it is possible to analyze small samples by volume - up to 0.1 g in the presence of excess oil and with high (up to 50 g/l) mineralization of solutions. The accuracy of the determination of surfactants in the proposed method is determined by the accuracy of the assigned dose volume of the titrant. The results of the analysis testify to the absence of a systematic component, both in the presence of organic impurities, and in the absence of them (polymer and oil), and the relative error in determination does not exceed 5%. There are prospects for the development of highly sensitive, rapid methods for determining surfactants and other microcomponents, not only in homogeneous systems, but also at the phase interfaces (micelles, nanoparticles, etc.) in complex composition solutions.