An electrochemical nitrite sensor based on a multilayer film of polyoxometalate

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 re- sults 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 mM of nitrite and no interference from other classical anions. Experimen- tal factors that affect electron-transfer rate in these films, such as pH effect and layers number, were systematically analyzed.
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Yosra Sahraoui, Sana Chaliaa, Abderrazak Maaref, Amor Haddad, Nicole Jaffrezic-Renault. An electrochemical nitrite sensor based on a multilayer film of polyoxometalate. Journal of Sensor Technology, Scientific Research, 2013, 3, pp.84-93. 〈10.4236/jst.2013.33014〉. 〈hal-01006345〉



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