Sensor systems based on ion exchange membranes for analysis of multicomponent solutions

Hybrid Materials Based on MF-4SC Membranes and Carbon Nanotubes: Transport Properties and Characteristics of DP-sensors in Hydrophobic Amino Acid Solutions

“…General approaches to the synthesis of modified membranes for potentiometric sensors with an internal reference solution have not yet been developed. The authors of [6,7] used perfluorinated sulfonated cation-exchange membranes gradient-modified along the sample length in potentiometric sensors with an internal reference solution, in which the analytical signal has the form of a Donnan potential (DP). These sensors are cross-sensitive to organic and inorganic ions; their characteristics are varied by changing the ionexchange and sorption properties of perfluorinated membranes of the Nafion type.…”

“…These sensors are cross-sensitive to organic and inorganic ions; their characteristics are varied by changing the ionexchange and sorption properties of perfluorinated membranes of the Nafion type. This modification is aimed at increasing the number of sorption sites and optimizing the intrapore space sizes that provide the highest concentration of analyte ions in the membrane taking into account their nature and size [6,7]. Thus, it was previously shown that the introduction of silica with a hydrophobizated surface into the pores of perfluorinated membranes leads to an increase in the stability of DP-sensor response in solutions of hydrophobic amino acids and a slight decrease in the interfering effect of hydroxonium ions [7].…”