Perfluorosulfonic Acid Membranes with Functionalized Carbon Nanotubes in Potentiometric Sensors for the Analysis of Nicotinic Acid Pharmaceuticals

Perfluorosulfonic acid membranes MF-4SC modified by carbon nanotubes ( CNT ) with carboxyl and sulfo groups are studied as materials for potentiometric cross-sensitive sensors for the determination of nicotinic acid in pharmaceutical solutions. The effect of the concentration of CNT and proton-donor properties of their surface on the equilibrium and transport properties of membranes and the characteristics of sensors is found. The effect of interfering hydroxonium ions on the response of sensors in nicotinic acid solutions is reduced in using membrane samples containing 0.5 and 1.0 wt