КОЛИЧЕСТВЕННОЕ ОПРЕДЕЛЕНИЕ КОБАЛЬТА В СОПОЛИМЕРАХ ВИНИЛЛАКТАМОВ С КРОТОНОВЫМ АЛЬДЕГИДОМ

Background. Metals are necessary for plants to perform vital functions and their inclusion in polymers intended for crop production seems promising. The study of polymer-metal complexes (MPC) is of undoubted interest from the point of view of creating new biologically active polymers. Knowledge of the laws and features of the interaction of metals with macromolecular compounds will allow a deeper understanding of the mechanism of action of these compounds. The determination of metal ions in the composition of polymer metal complexes was previously carried out by elemental analysis. Purpose: to determine cobalt ions in the presence of xylene orange in cobalt-containing copolymers based on vinylcaprolactam and vinylpyrrolidone with crotonaldehyde. Methodology. The content of cobalt ions in the metal complex was determined on a device of the brand "KFK". Potentiometric titration was carried out on a potentiometer "Universal ionomer EV-74." Spectra in the visible region (200-750 nm) of copolymer solutions and complex compounds were recorded on an SF-26 spectrophotometer. Originality. A new method has been developed for determining cobalt and applying it to the analysis of copolymers based on vinylcaprolactam with crotonic aldehyde and vinylpyrrolidone with crotonic aldehyde containing from 1.19 to 12.57% cobalt. Findings. The effect of macroligands of vinylcaprolactam with crotonic aldehyde and vinylpyrrolidone with crotonic aldehyde on the determination of cobalt ions in the presence of xylenol orange was studied. It was shown that with a 1000-fold excess (in moles), the high molecular weight base of the copolymers of vinylcaprolactam with crotonic aldehyde and vinylpyrrolidone with crotonic aldehyde does not interfere. [ABSTRACT FROM AUTHOR]