Simultaneous quantification of Cd(II) and Pb(II) in surface marine sediments using Ag-Hg and Ag-Bi nanoalloys glassy carbon modified electrodes

Danny Valera; Lenys Fernández; Gema González; Hugo Romero; Omar Martínez; Patricio J Espinoza-Montero

doi:10.1016/j.heliyon.2021.e07120

Simultaneous quantification of Cd(II) and Pb(II) in surface marine sediments using Ag-Hg and Ag-Bi nanoalloys glassy carbon modified electrodes

Heliyon. 2021 May 29;7(5):e07120. doi: 10.1016/j.heliyon.2021.e07120. eCollection 2021 May.

Authors

Danny Valera¹, Lenys Fernández², Gema González^{3

4}, Hugo Romero⁵, Omar Martínez⁵, Patricio J Espinoza-Montero²

Affiliations

¹ Universidad Simón Bolívar, Departamento de Química, Caracas, 1080-A, Venezuela.
² Pontificia Universidad Católica del Ecuador, Escuela de Ciencias Químicas, Quito, 17-01-2184, Ecuador.
³ Yachay Tech University, School of Physical Sciences and Nanotechnology, Urcuqui, 100119, Ecuador.
⁴ Instituto Venezolano de Investigaciones Científicas, Centro de Ing. de Materiales y Nanotecnología, Caracas, 1020-A, Venezuela.
⁵ Universidad Técnica de Machala, Facultad de Ciencias Químicas y de la Salud, Machala, 070151, Ecuador.

Abstract

The evaluation of glassy carbon (GC) electrodes modified with a Nafion (Nf) film and doped with nanoalloys (Nys) deposits of Ag-Hg and Ag-Bi and their application to determination of Cd (II) and Pb(II) in marine sediments, is described. Deposited Ag-Hg and AgBi Nys have a size of approximately ~80 nm dispersed and embedded inside the booths of the Nf net, while other of them remained on Nf net surface. For the AgBiNysNf-GC electrode, a detection limit (DL), 3 s criterion, slightly higher than for the AgHgNysNf-GC modified electrode was obtained. Accuracy of measurements was asserted by comparison with quantification of Cd and Pb in three sets of marine sediments samples previously analyzed by inductively coupled plasma optical emission spectroscopy (ICP-OES). The values of the standard deviation and the coefficients of variation are very low, and also comparable between the different determinations.

Keywords: Bimetallic nanoparticles; ICP-OES spectroscopy; Modified electrodes; Pb and Cd anodic stripping voltammetry.