Functionalised multi-walled carbon nanotubes-modified electrode for sensitive determination of Diuron in seawater samples. Issue 15 (8th December 2019)

• Record Type: Journal Article
• Authors: Morita, Isabela M.; Araújo, Gabriela M.; Codognoto, Lucia; Simões, Fábio Ruiz
• Is Part Of: International journal of environmental analytical chemistry. Volume 99:Issue 15(2019)
• Page Start: 1565
• Page End: 1574
• Publication Date: 2019-12-08
• Subjects: Diuron -- electroanalysis -- functionalised multi-walled carbon nanotubes; Ecology -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental chemistry -- Periodicals; Pollution -- Periodicals; 577.14
• DOI: 10.1080/03067319.2019.1625344
• Languages: English
• ISSNs: 0306-7319

Abstract

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 μA/μmol L −1 about 10 times higher than the unmodified counterpart (GCE) which showed a sensitivity of 0.192 μA/μmol L −1 . The limits of detection and quantificationwere 6.88 × 10 −8 and 2.29 × 10 −7 mol L −1 for GCE/MWCNT-COOH while for GCE were 7.87 × 10 −7 and 2.62 × 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%.