A Highly Sensitive Impedimetric Metamitron Microsensor Based on All-Solid-State Membrane Using a New Ion-Pair Complex, [3,3′-Co(1,2-closo-C<sub>2</sub>B<sub>9</sub>H<sub>11</sub>)<sub>2</sub>]<sup>−</sup>[C<sub>10</sub>H<sub>11</sub>ON<sub>4</sub>]<sup>+</sup>
oleh: Zakaria Ayroud, Juan Gallardo-Gonzalez, Abdoullatif Baraket, Marie Hangouet, Albert Alcácer, Angelos Streklas, Joan Bausells, Abdelhamid Errachid, Nadia Zine
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2018-12-01 |
Deskripsi
An all-solid-state impedimetric microsensor based on impedimetric measurements for detecting the herbicide metamitron (MM) is reported in the present work. For this purpose, a novel metamitron ionophore has been prepared. It was based on the isolation of the metamitron monoprotonated form coupled to the metallocarborane anion, cobalt bis (dicarbollide), ([3,3′-Co(1,2-<i>closo</i>-C<sub>2</sub>B<sub>9</sub>H<sub>11</sub>)<sub>2</sub>]<sup>−</sup>) as an ion-pair complex of the type [3,3′-Co(1,2-<i>closo</i>-C<sub>2</sub>B<sub>9</sub>H<sub>11</sub>)<sub>2</sub>]<sup>−</sup>[C<sub>10</sub>H<sub>11</sub>ON<sub>4</sub>]+. Once the ion-pair complex was synthetized, it was incorporated to a PVC-type membrane including o-Nitrophenyloctylether (o-NPOE) as plasticizer. The membrane was then drop-cast on top of polypyrrole-modified gold working microelectrodes. A quick response of 30 s has been provided by the microsensor in the range of metamitron concentrations between 10<sup>−8</sup> M and 10<sup>−4</sup> M with a limit of detection of 10<sup>−8</sup> M. Furthermore, it was highly selective toward metamitron, when compared to some possible interfering compounds as imazapic and carbetamide.