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Preparation and Properties of the Hybrid Material n ‐Propyl(3‐methylpyridinium)silsesquioxane Chloride. Application in Electrochemical Determination of Nitrite
Author(s) -
Magosso Hérica A.,
Luz Rita C. S.,
Gushikem Yoshitaka
Publication year - 2010
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200900297
Subject(s) - silsesquioxane , nitrite , chloride , electrochemistry , amperometry , chemistry , adsorption , inorganic chemistry , carbon paste electrode , electrode , polymer , ion exchange , ion , nuclear chemistry , organic chemistry , cyclic voltammetry , nitrate
The 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 =8.7×10 3 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.