Cherniavska A. Interaction of cationic flocculants of polyacrylamide type with anionic dyes and chelate complexes and its use in analysis

The dissertation is devoted to the study of reactions of formation reactions of ionic associates of anionic dyes and chelate complex anions with cationic flocculants of polyacrylamide type (CPAA). It was found that the main reason for the changes in the absorption spectra upon the interaction of organic dyes (OD) with CPAA is the shift of the acid-base balance of organic dyes due to the formation of stable ionic associates (IA) CPAA with a dual-charge anionic form of the dye. For sulfophthalein dyes, this process is accompanied by aggregation of dye ions. Aggregation is stronger in the reaction of CPAA with fluorescein dyes. It is established that the degree of interaction of OD with CPAA decreases with decreasing charge density and for CPAA with a charge density of 10% is completely absent. The influence of CPAA on complex chelate compounds formation in organic reagent - metal ion systems has been studied. It is shown that inorganic anions lead to the destruction of IA CPAA-OD and have almost no effect on the formation of IA CPAA with chelate complex anions. It was found that CPAA can have a positive effect on the formation of IA OD with nitrogen-containing organic compounds. Modification by CPAA leads to a shift of the pK of the dye to a more acidic area, where the nitrogen-containing compound is already protonated, which creates the conditions for a contrasting color change. Methods for determining charge density, concentration of CPAA at the level of MPC in drinking water using IA OD or chelate complexes with CPAA, methods for determination of sulfate ions in natural waters, loratadine, mebeverine, levofloxacine in drugs based on destruction of IA OD-CPAA, scandium content in aluminum-scandium alloy are developed.