An Electrochemical Nitrite Sensor Based on a Multilayer Film of Polyoxometalate

Yosra Sahraoui, Sana Chaliaa, Abderrazak Maaref, Amor Haddad, Nicole Jaffrezic-Renault

Laboratory of Interfaces and Advanced Materials, Faculty of Sciences of Monastir, Monastir, Tunisia.
Laboratory of Materials and Crystallochemistry, Superior Institute of Applied Science and Technology, Mahdia, Tunisia.
University of Lyon, Institute of Analytical Chemistry, Villeurbanne, France.

DOI: 10.4236/jst.2013.33014                

Abstract

In this work, we have developed an electrochemical sensor for nitrite detection, based on a polyoxometalate (POM) namely mono-lacunary keggin anion [SiW₁₁O₃₉]^8﹣ cited as (SiW₁₁). Electrochemical characterization of SiW₁₁ shows two-step reduction processes, with formal potentials of ﹣0.5 V (I) and ﹣0.68 V (II). Oppositely charged polyelectrolyte (poly (allylamine hydrochloride) (PAH)) and (SiW₁₁) were assembled alternately to modify glassy carbon electrode. The electrochemical behavior of the modified electrode was studied in detail using cyclic voltammetry (CV). The results showed that SiW₁₁/PAH/GC electrode present good electrocatalytic activity for the reduction of nitrite. The sensor showed a dynamic range from 100 μM to 3.6 mMof nitrite and no interference from other classical anions. Experimental factors that affect electron-transfer rate in these films, such as pH effect and layers number, were systematically analyzed.

Keywords

Nitrite Sensor; Polyoxometalate; Mono-Lacunary Keggin Anion; Layer by Layer Assembly Process

Conflicts of Interest

The authors declare no conflicts of interest.

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