The potentiometric determination of thiamine chloride based on balance of its sorption from aqueous solutions by perfluorcarbonic polymers
Keywords:
Donnan potential, sorption, potentiometric sensor array, perfluorinated sulfonic cationexchange polymer, tiamin chloride.Abstract
The systems, which include perfluorinated sulfonic cation-exchange polymers and tiamin chloride
aqueous solutions, are investigated by use potentiometric and conductiometric methods. Tiamin chloride is
strong electrolit, the ionic composition of its solutions in investigated range of рН 3,17-4,09 includes
monovalent tiamin-cations and chloride-anions. Potentiometric sensor array for the determination of tiamin
chloride in aqueous solutions containing potassium and sodium chlorides is proposed. The sensor array consists
of a cross-sensitive sensor, which response is the Donnan potential on the interface of perfluorinated sulfonic
cation-exchanger/ an investigated solution, potassium-, sodium-selective electrodes and silver chloride/silver
reference electrode. The methods of multidimensional regression have been used in the analysis for calculation
of concentration of components. The characteristics of the sensor array for the determination of tiamin,
potassium and sodium were as follows: working range of concentrations was 10-4-10-2 M, the repeatability was
≤10%, the response time was 5-7 min
