Determination of sulfur containing anions in alkaline solutions using arrays of DP sensors based on hybrid perfluorinated membranes with proton donor dopants
The influence of proton donor properties and concentration of dopant nanoparticles introduced into Nafion and MF 4SS perfluorosulfonic cation exchange membranes on the characteristics of cross sensitive DP sensors (sensors whose analytical signal is the Donnan potential) in alkaline solutions of sulfur containing organic compounds were studied. The dopants were acid salts of heteropoly acids (HPAs) and hydrated silica SiO2 and zirconia ZrO2 surface modified with sulfur containing groups and an acid HPA salt. A correlation was revealed between the DP sensor sensitivity to anions (and zwitter ions) in alkaline solutions, size and proton donor ability of the added particles, and diffusion permeability of hybrid membranes. Optimum compositions of membranes for arrays of cross sensitive DP sensors ensuring the simultaneous determination of cations and anions (and zwitter ions) in the test solutions with an error of less than 18% were selected.
Journal of Analytical Chemistry