Electroanalytical Determination of Estrone in Seawater Samples Using Functionalized Multiwalled Carbon Nanotubes

Autor(es)

Okina, Renato Hisashi ^[1] ; Valle, Eliana Maira Agostini ^[1] ; Simoes, Fabio Ruiz ^[2] ; Codognoto, Lucia ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo, Inst Environm Chem & Pharmaceut Sci, Diadema - Brazil

^[2] Univ Fed Sao Paulo, Inst Marine Sci, Santos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Electroanalysis; v. 33, n. 5 MAR 2021.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 14/23858-3 - Desenvolvimento de materiais de sensores baseados em filmes automontados de polímeros condutores e nanotubos de carbono para a determinação de desreguladores endócrinos em ambientes marinhos
• Beneficiário: Fabio Ruiz Simões
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/24742-7 - Sensores baseados em compósitos de polímeros condutores e grafeno visando à determinação de substâncias desreguladoras endócrinas em ambiente marinho
• Beneficiário: Fabio Ruiz Simões
• Modalidade de apoio: Auxílio à Pesquisa - Regular