Electrochemical Determination of Lead Using A Composite Sensor Obtained from Low-Cost Green Materials:Graphite/Cork

Applied Sciences

Marco Vocciante¹  Sergio Ferro²  Iasmin B. Silva³  Carlos A. Martínez-Huitle³  Elisama V. Dos Santos³  Danyelle Medeiros de Araújo⁴ 

[1] Department of Chemistry and Industrial Chemistry, University of Genova, 16124 Genova, Italy;Ecas4 Australia Pty Ltd., Mile End South 5031, Australia;Laboratório de Eletroquímica Ambiental e Aplicada, Instituto de Química, Universidade Federal do Rio Grande do Norte, Lagoa Nova, Natal 59072-900, Brazil;Laboratório de Eletroquímica e Química Analítica, Departamento de Química, Universidade do Estado do Rio Grande do Norte, Mossoró 59610-210, Brazil;

关键词: cork–graphite electrode;    electrochemistry;    lead;    environmental application;   

DOI  :  10.3390/app11052355

来源: DOAJ

【 摘 要 】

The purpose of this study was to develop an inexpensive, simple, and highly selective cork-modified carbon paste electrode for the determination of Pb(II) by differential pulse anodic stripping voltammetry (DPASV) and square-wave anodic stripping voltammetry (SWASV). Among the cork–graphite electrodes investigated, the one containing 70% w/w carbon showed the highest sensitivity for the determination of Pb(II) in aqueous solutions. Under SWASV conditions, its linear range and relative standard deviation are equal to 1–25 µM and 1.4%, respectively; the limit of detection complies with the value recommended by the World Health Organization. To optimize the operating conditions, the selectivity and accuracy of the analysis were further investigated by SWASV in acidic media. Finally, the electrode was successfully applied for the determination of Pb(II) in natural water samples, proving to be a sensitive electrochemical sensor that meets the stringent environmental control requirements.

【 授权许可】

Unknown