| Full text | |
| Author(s): |
Okina, Renato Hisashi
[1]
;
Valle, Eliana Maira Agostini
[1]
;
Simoes, Fabio Ruiz
[2]
;
Codognoto, Lucia
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Fed Sao Paulo, Inst Environm Chem & Pharmaceut Sci, Diadema - Brazil
[2] Univ Fed Sao Paulo, Inst Marine Sci, Santos, SP - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Electroanalysis; v. 33, n. 5 MAR 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
In this work, a glassy carbon electrode (GCE) modified with multiwalled carbon nanotubes functionalized with carboxylic groups (MWCNT-COOH) was used to determine the hormone estrone in seawater samples. Modification of the electrode was optimized using three successive 10-mu L aliquots of the MWCNT-COOH dispersion in ethanol (1 : 5 mL). The cyclic voltammetry results showed an oxidation peak at 0.59 V with characteristics of an irreversible process, pH dependent and controlled by adsorption of species. The results of square-wave voltammetry showed that the intensities of peak currents for the MWCNT-COOH/GCE were about 2.5 times higher than for GCE. The calibration curve showed a linearity of 0.9981 and a sensitivity of 0.1521 mu A/mol L-1. The limits of detection and quantification were 0.117 and 0.392 mu mol L-1, respectively. The recovery obtained using seawater samples was 91%, indicating the applicability of the method in marine environments. (AU) | |
| FAPESP's process: | 14/23858-3 - Development of sensor materials based on Self assembled fims of conducting polymers and carbon nanotubes for the determination of endocrine disrupters in marine environments |
| Grantee: | Fabio Ruiz Simões |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 17/24742-7 - Sensors based on composites of conducting polymers and graphene aiming the determination of endocrine disruptor substances in marine environment |
| Grantee: | Fabio Ruiz Simões |
| Support Opportunities: | Regular Research Grants |