| Texto completo | |
| Autor(es): |
de Oliveira Lins, Renato Soares
;
Sukeri, Anandhakumar
;
Bertotti, Mauro
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ANALYTICAL METHODS; v. 16, n. 26, p. 6-pg., 2024-06-06. |
| Resumo | |
A nanoporous gold microelectrode (NPG-mu E) was fabricated and used for Pb(ii) detection in seawater samples via square wave anodic stripping voltammetry (SWASV). The Au microelectrode (Au-mu E) was fabricated by embedding a gold microfiber into a Pasteur pipette, and its surface was further modified by an anodization-electrochemical reduction (A-ECR) method, yielding the NPG-mu E. The fabricated electrodes were characterized by cyclic voltammetry (CV) and field emission scanning electron microscopy (FE-SEM) for electrochemical and structural morphological investigations. SWASV results show a Pb(ii) stripping peak at around -0.05 V vs. Ag/AgCl, sat. KCl, which is unusual for common Pb(ii) detection (typically occurring at around -0.40 V) in anodic stripping voltammetry (ASV) analysis. The Pb(ii) detection at less negative stripping potential is more beneficial. Hence, it exhibited anti-interference properties with Cd(ii), which is attributed to the preferential deposition and stripping of the target analyte on the low-indexed crystal planes of the NPG structure. The calibration plot obtained by SWASV was linear in the concentration range of 0.1-10 mu M, and the detection limit was found to be 57 nM (correlation coefficient of 0.9974). The NPG microsensor presented a 15-fold enhanced current response compared to Au-mu E, with excellent sensitivity (27.2 mu A mu M-1 cm(-2)). The application of the NPG microsensor was examined by detecting Pb(ii) in seawater samples, and a satisfactory performance was obtained. (AU) | |
| Processo FAPESP: | 14/15215-5 - Fabricação e caracterização de nanoeletrodos para uso em microscopia eletroquímica: aplicações analíticas e de caráter fundamental |
| Beneficiário: | Sukeri Anandhakumar |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 18/08782-1 - Sensores químicos miniaturizados e integrados: novas plataformas de fabricação para aplicações biológicas, clínicas e ambientais |
| Beneficiário: | Mauro Bertotti |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |