INVESTIGATION OF INTERACTION OF BROMPHENOL SYNTHES WITH CATIONIC POLYACRYLAMIDES AND APPLICATION OF IT IN THE ANALYSIS

Abstract

The aim of this work was to study the interaction of bromophenol blue with cationic polyacrylamides and the development on this basis of a simple, rapid and highly sensitive technique for determining the content of copolymers of acrylamide and the chloromethylated polymer in waters containing moderate amounts of strong electrolytes. The changes in the spectra are similar to those observed for the same dyes in the presence of cationic surfactant micelles. It is shown that two types of effects appear in the presence of polymers: the shift of the acid-base equilibrium caused by the formation of the ionic associate polymer-dye and the aggregation of the dye. Optimal conditions for the formation of the ion associate are established. The presence of salts in concentrations above the critical leads to a decrease in light absorption, the appearance of a negative systematic error. The application of the photometric titration method makes it possible to compensate to a certain extent the interfering effect of inorganic ions. In the presence of inorganic salts, the shape of the photometric titration curve near the end point of the titration is washed out, but its position remains practically unchanged, which makes it possible to determine the polymer flocculant in the presence of not very large concentrations of inorganic salts. Spectrophotometric methods for determining the content of CPAA FO in production solutions or natural waters with a low level of mineralization by methods of a calibration curve and photometric titration have been developed. Method of a calibration curve allow allows to determine polymer in the range of concentrations 0,12 –1,8 μg/L. The limit of determination of CPAA FO is 0.088 μg/L. The methods are tested on artificial mixtures and artesian water.

Keywords

• бромфеноловий синій
• катіонний флокулянт
• іонний ассоціат
• агрегація
• фотометричне титрування