Electroanalytical determination of heavy metals in aqueous solutions by using a carbon paste electrode modified with spent coffee grounds

被引：26

作者：

Estrada-Aldrete, J. ^{[1
]}

Hernandez-Lopez, J. M. ^{[1
]}

Garcia-Leon, A. M. ^{[1
]}

Peralta-Hernandez, J. M. ^{[3
]}

Cerino-Cordova, F. J. ^{[1
,2
]}

机构：

[1] Univ Autonoma Nuevo Leon, Fac Ciencias Quim, Av Univ S-N,Cd Univ, San Nicolas De Los Garza 66455, Nuevo Leon, Mexico

[2] Univ Autonoma Nuevo Leon, FIME, Av Univ S-N,Cd Univ, San Nicolas De Los Garza 66455, Nuevo Leon, Mexico

[3] Univ Guanajuato, Dept Quim, Div Ciencias Nat & Exactas, Cerro Venada S-N, Guanajuato 36040, Mexico

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2020年 / 857卷

关键词：

Cadmium; Anodic stripping voltammetry; Lead; Agricultural waste; Biomass modified electrode; ANODIC-STRIPPING VOLTAMMETRY; TRACE CADMIUM; IONS; LEAD; ADSORPTION; CU(II); BIOSORPTION; DEPOSITION; COMPOSITE; SURFACES;

D O I：

10.1016/j.jelechem.2019.113663

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In this paper, the quantification of Pb2+ and Cd2+ at trace levels was carried out by differential pulse anodic stripping voltammetry technique, using a paste carbon electrode modified with spent coffee grounds (SCG) as working electrode. Different percentages of SCG (40, 50.60, 70% of SCG) were tested in the experiments; the best electrochemical response was obtained with the electrode modified with 50% of SCG. An experimental design was performed in order to maximize the intensity of the oxidation current, using the accumulation time and the reduction potential as factors. The best experimental conditions for the electrodeposition of the cadmium ions were obtained at an accumulation time of 76 s, and the reduction potential of -1115 my; while for the electrodeposition of lead ions, the best performance was obtained at an accumulation time of 120 s and a reduction potential of -1200 mV. The detection limit of the carbon paste electrode modified with 50% of SCG were 89 and 90 mu M for Cd(II) and Pb(II), respectively, showing the potential of these electrodes as a viable and sustainable alternative for the determination of heavy metals in aqueous solutions. (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：7