Preparation and Properties of the Hybrid Material n‐Propyl(3‐methylpyridinium)silsesquioxane Chloride. Application in Electrochemical Determination of Nitrite

Abstract

AbstractThe synthesis and properties of the ion exchange polymer 3‐n‐propyl(3‐methylpyridinium)silsesquioxane chloride (SiPy+Cl−) are described. Based on the Langmuir model, the equilibrium constant at the solid‐solution interface for the reaction, SiPy+Cl−+NO$\rm{{_{2}^{-}}}$⇌SiPy+NO$\rm{{_{2}^{-}}}$, was calculated for nitrite adsorption. The value found, β=8.7×103 L mol−1, indicates good affinity of the anion for the solid phase. A carbon paste electrode of the material was tested for NO$\rm{{_{2}^{-}}}$ oxidation and a linear response, in the concentration range between 6.3 and 143.6 μmol L−1, was obtained by amperometry. The analytical applicability of the proposed system was ascertained by the satisfactory results attained in its application to monitoring of nitrite in natural waters.