CUANTIFICACIÓN DE PLOMO Y CADMIO EN MUESTRAS ALIMENTARIAS USANDO  VOLTAMPEROMETRIA DE REDISOLUCIÓN ANÓDICA

J. Sebastian Álava Viteri; Juan Bravo Bustamante; Andrea Montalvo Flores; Carlos Cevallos-Morillo

doi:10.47187/perf.v1i32.305

Authors

J. Sebastian Álava Viteri Universidad Central del Ecuador, Facultad de Ciencias Químicas, Laboratorio de Electro-Catálisis Aplicada, Quito, Ecuador
Juan Bravo Bustamante Universidad Central del Ecuador, Facultad de Ciencias Químicas, Laboratorio de Electro-Catálisis Aplicada, Quito, Ecuador
Andrea Montalvo Flores Universidad Central del Ecuador, Facultad de Ciencias Químicas, Laboratorio de Electro-Catálisis Aplicada, Quito, Ecuador
Carlos Cevallos-Morillo Universidad Central del Ecuador, Facultad de Ciencias Químicas, Laboratorio de Electro-Catálisis Aplicada, Quito, Ecuador

DOI:

https://doi.org/10.47187/perf.v1i32.305

Keywords:

Bismuth electrode, electrochemistry, determination, glassy carbon electrode, sample preparation

Abstract

Towards the end of 2023, the Ecuadorian goverment through the Agencia Nacional de Regulación, Control y Vigilancia Sanitaria (ARSA), reported lead contamination of several groceries, including milk, flour and cinnamon as well as their derivates. Several laboratories and regulatory institutions had to developed and apply accurate methods for lead determination in these kind of matrices. Here, we present an easy, low cost method to treat food samples in order to measure Pb²⁺ and Cd²⁺ concentrations, for comparative, legal and sanitary reasons. Metals determination was made using Square Wave Anodic Stripping Voltammetry (SWASV), employing a glassy carbon electrode coated with a bismuth film into acid media. Experimental paremeters were obtained then a calibration curve was built. A linear relationship between peak current and lead and cadmium concentration was found, a limit of detection of 2,15 and 1,65 μM was calculated for Pb²⁺ and Cd²⁺ respectively. An intercomparison assay also was made with Atomic Absortion Spectroscopy. Finally, this electrochemical method was employed for the determination of lead and cadmium into six different food samples.

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