Journal of Sensor Technology

Volume 3, Issue 3 (September 2013)

ISSN Print: 2161-122X   ISSN Online: 2161-1238

Google-based Impact Factor: 2.07  Citations  

An Electrochemical Nitrite Sensor Based on a Multilayer Film of Polyoxometalate

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DOI: 10.4236/jst.2013.33014    4,146 Downloads   7,717 Views  Citations

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.

Share and Cite:

Y. Sahraoui, S. Chaliaa, A. Maaref, A. Haddad and N. Jaffrezic-Renault, "An Electrochemical Nitrite Sensor Based on a Multilayer Film of Polyoxometalate," Journal of Sensor Technology, Vol. 3 No. 3, 2013, pp. 84-93. doi: 10.4236/jst.2013.33014.

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