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A Nitrite Electrochemical Sensor Based on Boron‐Doped Diamond Planar Electrochemical Microcells Modified with a Monolacunary Silicotungstate Polyoxoanion
Author(s) -
Sahraoui Yosra,
Sbartai Amel,
Chaliaa Sana,
Maaref Abderrazak,
Haddad Amor,
JaffrezicRenault Nicole
Publication year - 2015
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201400682
Subject(s) - nitrite , electrode , diamond , detection limit , electrochemistry , cyclic voltammetry , scanning electron microscope , analytical chemistry (journal) , boron , materials science , chemistry , inorganic chemistry , nuclear chemistry , chromatography , metallurgy , nitrate , composite material , organic chemistry
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/SiW 11 ) modified (BDD) electrode. It was found that (SiW 11 ) layer was uniformly formed on the electrode surface. It was observed that (BDD/PPD/SiW 11 ) 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.