Functionalised multi-walled carbon nanotubes-modified electrode for sensitive determination of Diuron in seawater samples

Author(s)

Morita, Isabela M. ^[1] ; Araujo, Gabriela M. ^{[2, 1]} ; Codognoto, Lucia ^[2] ; Simoes, Fabio Ruiz ^[1]

Affiliation

^[1] Univ Fed Sao Paulo, Inst Marine Sci, Santos - Brazil

^[2] Univ Fed Sao Paulo, Inst Environm Chem & Pharmaceut Sci, Diadema - Brazil

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY; v. 99, n. 15 JUN 2019.
• Web of Science Citations: 0

Abstract

This work was focused in to develop an electroanalytical method based on a direct modification of a glassy carbon electrode (GCE) by the deposition of successive aliquots of diluted dispersions of functionalised carbon nanotubes (MWCNT-COOH) in ethanol (0.1 mg.mL(-1)) aiming the determination of Diuron into seawater samples, a common antifouling substance, using differential pulse voltammetry as electroanalytical technique. The GCE/MWCNT-COOH showed a sensitivity of 2.20 mu A/mu mol L-1 about 10 times higher than the unmodified counterpart (GCE) which showed a sensitivity of 0.192 mu A/mu mol L-1. The limits of detection and quantificationwere 6.88 x 10(-8) and 2.29 x 10(-7) mol L-1 for GCE/MWCNT-COOH while for GCE were 7.87 x 10(-7) and 2.62 x 10(-6) mol L-1, respectively. The applicability was evaluated with spiked detectable amounts of Diuron into seawater samples. The recovery results were between 76% and 119%. (AU)

• 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