Functionalised multi-walled carbon nanotubes-modified electrode for sensitive determination of Diuron in seawater samples |
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Authors: | Isabela M Morita Gabriela M Araújo Lucia Codognoto |
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Institution: | 1. Institute of Marine Sciences, Federal University of S?o Paulo, Santos, Brazil;2. Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of S?o Paulo, Diadema, Brazil https://orcid.org/0000-0002-4595-5295;3. Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of S?o Paulo, Diadema, Brazil https://orcid.org/0000-0002-3006-0149 |
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Abstract: | ABSTRACTThis 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%. |
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Keywords: | Diuron electroanalysis functionali?sed multi-walled carbon nanotubes |
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