Publication
Electroanalysis of formetanate hydrochloride by a cobalt phthalocyanine functionalized multiwalled carbon nanotubes modified electrode: characterization and application in fruits
| dc.contributor.author | Ribeiro, Francisco Wirley Paulino | |
| dc.contributor.author | Lucas, Francisco Willian de Souza | |
| dc.contributor.author | Mascaro, Lucia H. | |
| dc.contributor.author | Morais, Simone | |
| dc.contributor.author | Casciano, Paulo Naftali da Silva | |
| dc.contributor.author | Lima-Neto, Pedro de | |
| dc.contributor.author | Correia, Adriana N. | |
| dc.date.accessioned | 2017-01-17T10:30:14Z | |
| dc.date.embargo | 2030 | |
| dc.date.issued | 2016 | |
| dc.description.abstract | This study characterizes the electroanalytical behavior of the carbamate pesticide formetanate hydrochloride (FMT) at a cobalt phthalocyanine (CoPc) functionalized multiwalled carbon nanotubes (fMWCNT) modified glassy carbon electrode (CoPc-fMWCNT/GCE). Nafion1 was used to improve solubility and dispersibility of fMWCNT. The construction of the developed electrode was characterized by high-resolution field-emission gun scanning electron microscopy, Raman spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy. FMT exhibited a behavior consistent with a three-step reaction of the electrochemical-chemical-electrochemical mechanistic type at CoPcfMWCNT/ GCE (three anodic peaks at 0.26, 0.55 and 1.2 V, and two cathodic peaks at 0.35 and 0.50 V vs. Ag/AgCl/3 M KCl). Highly reproducible and well-defined peaks were obtained at the optimum experimental conditions (Britton-Robinson buffer at pH 5.0, accumulation potential 1.55 V, accumulation time 5 s, frequency 100 s-1, amplitude 30 mV, and scan increment 3 mV). Peak currents were found to be proportional to the FMT concentrations in the range of 9.80*10-8 to 3.92*10-6 mol dm-3 with a detection limit (LOD) of 9.7*10-8 mol dm-3. The modification of GCE with CoPc-fMWCNT enhanced the electrocatalytic activity and provided high sensitivity (3.51 A mol-1dm3). The developed electroanalytical methodology was successfully applied to FMT residue analysis in mango and grape samples with recoveries in the range of 94.2+_4.5 to 105.7+_1.8%. The proposed electroanalytical approach represents a reliable, sensitive and environmental friendly analytical alternative for determination of FMT. | pt_PT |
| dc.description.version | info:eu-repo/semantics/publishedVersion | pt_PT |
| dc.identifier.doi | 10.1016/j.electacta.2016.02.086 | pt_PT |
| dc.identifier.uri | http://hdl.handle.net/10400.22/9281 | |
| dc.language.iso | eng | pt_PT |
| dc.publisher | Elsevier | pt_PT |
| dc.relation.ispartofseries | Electrochimica Acta;Vol. 194 | |
| dc.relation.publisherversion | http://www.sciencedirect.com/science/article/pii/S0013468616303620 | pt_PT |
| dc.subject | Multiwalled carbon nanotubes | pt_PT |
| dc.subject | Metal phthalocyanine complexes | pt_PT |
| dc.subject | Modified electrode | pt_PT |
| dc.subject | Pesticides | pt_PT |
| dc.title | Electroanalysis of formetanate hydrochloride by a cobalt phthalocyanine functionalized multiwalled carbon nanotubes modified electrode: characterization and application in fruits | pt_PT |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 198 | pt_PT |
| oaire.citation.startPage | 187 | pt_PT |
| oaire.citation.title | Electrochimica Acta | pt_PT |
| oaire.citation.volume | 194 | pt_PT |
| person.familyName | Morais | |
| person.givenName | Simone | |
| person.identifier | 1598822 | |
| person.identifier.ciencia-id | B111-BBFB-F200 | |
| person.identifier.orcid | 0000-0001-6433-5801 | |
| person.identifier.scopus-author-id | 7007053747 | |
| rcaap.rights | closedAccess | pt_PT |
| rcaap.type | article | pt_PT |
| relation.isAuthorOfPublication | 7a9c7d63-a6c7-4159-b12d-b049b8c5c8f9 | |
| relation.isAuthorOfPublication.latestForDiscovery | 7a9c7d63-a6c7-4159-b12d-b049b8c5c8f9 |