PD-sensors based on perfluorinated membranes for simultaneous determination of vitamins B1, B6, and PP in aqueous solutions

The effect of the presence of bulky organic cations in the phase of perfluorosulfonated cationexchange membranes on the sensitivity of PD-sensors to ions of vitamins (nicotinic acid, pyridoxine, and thiamin) and hydronium in aqueous solutions has been studied. Three cross-sensitive PD-sensors based on perfluorinated membranes have been used for simultaneous determination of the ions of nicotinic acid, pyridoxine, and thiamine in aqueous solutions. The relative error of determination of the vitamins does not exceed 12%; the relative standard deviation of the determination results is no more than 0.04; the detection limit and the determination limit are 4.9 × 10−6 and 1.6 × 10−5 mol/L, respectively.