Autor(es): Oliveira, Raissa C. de ; Sousa, Camila P. ; Freire, Tiago M. ; Freire, Rafael M. ; Denardin, Juliano C. ; Fechine, Pierre B. A. ; Becker, Helena ; Morais, Simone ; Lima-Neto, Pedro de ; Correia, Adriana N.
Data: 2018
Identificador Persistente: http://hdl.handle.net/10400.22/14572
Origem: Repositório Científico do Instituto Politécnico do Porto
Assunto(s): Bendiocarb; Magnetic nanoparticles; Nanocomposite; Chitosan; Electrochemical sensor
A novel platform for carbamate-based pesticide quantification using a chitosan/magnetic iron oxide (Chit-Fe3O4) nanocomposite as a glassy carbon electrode (GCE) modifier is shown for an analytical methodology for determination of bendiocarb (BND). The BND oxidation signal using GCE/Chit-Fe3O4 compared with bare GCE was catalyzed, showing a 37.5% of current increase with the peak potential towards less positive values, showing method's increased sensitivity and selectivity. Using square-wave voltammetry (SWV), calibration curves for BND determination were obtained (n = 3), and calculated detection and quantification limits values were 2.09 × 10-6 mol L-1 (466.99 ppb) and 6.97 × 10-6 mol L-1 (1555.91 ppb), respectively. The proposed electroanalytical methodology was successfully applied for BND quantification in natural raw waters without any sample pretreatment, proving that the GCE/Chit-Fe3O4 modified electrode showed great potential for BND determination in complex samples. ᅟ Graphical abstract.
