A Nitrite Electrochemical Sensor Based on Boron‐Doped Diamond Planar Electrochemical Microcells Modified with a Monolacunary Silicotungstate Polyoxoanion |
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| Authors: | Yosra Sahraoui Amel Sbartai Sana Chaliaa Abderrazak Maaref Amor Haddad Nicole Jaffrezic‐Renault |
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| Affiliation: | 1. Laboratory of Interfaces and Advanced Materials, Faculty of Sciences of Monastir, Monastir, Tunisia;2. University of Lyon, Institute of Analytical Chemistry, Villeurbanne, France, [Universite de Lyon, Institut des Sciences Analytiques (ISA), UMR CNRS 5280, 5 rue de la Doua 69100 Villeurbanne, France] phone: +33437423558;3. Laboratory of Materials and Crystallochemistry, Superior Institute of Applied Science and Technology, Mahdia, Tunisia |
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| Abstract: | A new boron doped diamond microcells (BDD) was modified, for rapid, selective and highly sensitive determination of nitrite, using a coating film of polyoxometalates (POMs), formed by cyclic voltammetry on the molecular p‐phenylenediamine (PPD) functionalized BDD. The scanning electron microscopy (SEM) technique was used to examine the morphology of (PPD/SiW11) modified (BDD) electrode. It was found that (SiW11) layer was uniformly formed on the electrode surface. It was observed that (BDD/PPD/SiW11) showed excellent electrocatalytic activities towards nitrite ion. Under the selected conditions, the anodic peak maximum at ?0.6 V was linear versus nitrite concentration in the 40 µM–4 mM range, and the detection limit obtained was 20 µM. The newly developed electrode has been successfully applied to the determination of nitrite content in real river water samples. |
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| Keywords: | Boron doped diamond electrode Square wave voltammetry Nitrite sensor Polyoxometalate Monolacunary Keggin anion |
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