info:eu-repo/semantics/article
Simple electrochemical detection method employing a hydrogel soft matrix: Application in tap water
Fecha
2018-11Registro en:
Martinez, María Victoria; Coneo Rodriguez, Rusbel; Bruno, Mariano Martín; Acevedo, Diego Fernando; Barbero, César Alfredo; Simple electrochemical detection method employing a hydrogel soft matrix: Application in tap water; Electrochemical Society; Journal of the Electrochemical Society; 165; 16; 11-2018; H1021-H1027
0013-4651
1945-7111
CONICET Digital
CONICET
Autor
Martinez, María Victoria
Coneo Rodriguez, Rusbel
Bruno, Mariano Martín
Acevedo, Diego Fernando
Barbero, César Alfredo
Resumen
The proposed method implies the electrochemical detection of an analyte preloaded in a hydrogel. In order to evaluate the potential application of this method, arsenic detection in tap water was performed. Polymeric hydrogels bearing cationic groups poly(Nisopropyacrylamide)-co-3-(acrylamidopropyl)trimethylammonium chloride were used to sorb arsenic ions, at basic pH, from thereal and synthetic stock samples. The concentration of arsenic was electrochemically determined using the loaded hydrogel and amodified glassy carbon electrode. Employing a cationic hydrogel, the peak current for the arsenic oxidation was ca. 8 times higherthan the peak current measured using poly(N-isopropyacrylamide), a neutral hydrogel, indicating a strong electrostatic interaction between the polymeric cationic groups and arsenite anions. By using this method, values of arsenic comparable to those measuredby Atomic Absorption Spectroscopy were obtained for tap water of small cities in Argentina. These results suggest that this new and easy method is suitable to sense a threshold limit of arsenic in real samples since the features of the hydrogel allow the arsenite loading into the matrix. Besides the cationic hydrogels could be employed to sampling on-field and to build a portable analysis system.