Influence of colloid-chemical state of solutions on fluorescence and spectrophotometry analytical signals of surfactants
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ORIGINAL PAPER
Influence of colloid‑chemical state of solutions on fluorescence and spectrophotometry analytical signals of surfactants in reaction with eosin Y Viktoriia Klovak1 · Sergey Kulichenko1 · Serhii Lelyushok1 Received: 26 March 2020 / Accepted: 4 June 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020
Abstract The regularities of the influence of the colloid-chemical state on the analytical signal of cationic surfactants in solutions of associates with the counterion have been investigated. These studies have carried out to create rational conditions for the determination of organic cations using analytical systems with reduced influence of colloidal aggregation of analytical forms. The significant influence of turbidity of solutions on the magnitude of the fluorescence and spectrophotometry analytical signal of cationic surfactants in the association reaction with eosin Y and the accuracy of its measurement has been shown. Herewith, the maximum value of turbidity corresponds to the formation of the reagent–cationic surfactant electroneutral associate and the minimum value of turbidity coincides with the formation of the charged associate. It has been shown that the minimal turbidity of aqueous solutions of reagent–cationic surfactant associates of different hydrophobicity corresponds to the formation of associates of the smallest size. The influence of the colloid-chemical state on the analytical signal of cationic surfactants in solutions of associates with the reagent in the presence of Triton X-100 has been investigated to eliminate the negative effects of colloidal aggregation. The non-ionic surfactant concentration dependences made it possible to trace the largest changes of the scattering factor when adding Triton X-100 to the solution in the field of stoichiometric molar ratios of the associate’s components. It has been found that non-ionic surfactants of the Triton X-100 type eliminate the influence of turbidity and scattering factor on the analytical signal of cationic surfactants. Keywords Fluorescence · Spectrophotometry · Turbidity · Cationic surfactant · Triton X-100 · Associate
Introduction Surfactants affect the entire complex of organic analytical reagents chemical–analytical properties in aqueous solutions (Savvin et al. 2006). The modification of reagents in surfactant solutions due to association processes is highlighted in the literature (Burmistrova et al. 2001) when discussing the chemistry of such an effect. On the other hand, several effects associated with the flow of solubilization processes at surfactant concentrations above the critical micelle concentration (CMC) are also distinguished (Miller 2008). The main forms of application of ionic surfactants in the analysis are their associates with counterions of organic * Viktoriia Klovak [email protected] 1
Kyiv National Taras Shevchenko University, Volodymirska St. 64, Kyiv 01601, Ukraine
reagents or metal complexes of the ionic type (Savvin et al. 2006). Associates formed in the reagent-ion surfactant sy
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