A new electrochemical sensor based on eco-friendly chemistry for the simultaneous determination of toxic trace elements
Nenhuma Miniatura disponível
Data
2020-11-01
Autores
Wong, Ademar [UNESP]
A. Ferreira, Priscila
Santos, Anderson M. [UNESP]
Cincotto, Fernando H.
Silva, Rodrigo A.B.
Sotomayor, Maria D.P.T. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
A method using glassy carbon electrode containing biochar, nanodiamonds and chitosan has been developed for simultaneous voltammetric quantification of cadmium and lead. The developed material was characterised by microscopy (transmission electron and scanning electron) and square-wave anodic stripping voltammetry. Using optimum conditions, the sensor exhibited excellent response for the simultaneous quantification of metal ions. High electrochemical sensitivities of 0.42 and 5.3 μA μmol−1 cm−2 was found for Cd and Pb quantification, respectively. Well separated peaks at −0.64 and −0.42 V vs. Ag/AgCl(KClsat) were obtained, as well as low limits of detection of 0.11 and 0.056 µmol L−1 and linear ranges of 1.0 to 75.0 and 0.25 to 6.0 μmol L−1 for cadmium and lead quantification, respectively. The modified GCE exhibited good repeatability, stability for 30 days and reproducibility (with a relative standard deviation between 4.6% and 4.9% for n = 5). The developed sensor presents high robustness, requiring no step cleaning of the electrode surface to remove any remaining bonded metals. An ecologically friendly, low cost and high yield electrode was therefore developed for the simultaneous determination of two toxic metals in real environmental samples applying square-wave anodic stripping voltammetry.
Descrição
Palavras-chave
Biochar, Electrochemical sensors, Environmentally-friendly chemical sensors, Nanodiamonds, Real environmental samples, Toxic metal determination
Como citar
Microchemical Journal, v. 158.