Determination of Zn 2+ and Cd 2+ by glassy carbon electrode modified with Perilla frutescens activated carbon

• Published in: Canadian journal of chemistry Vol. 98; no. 4; pp. 184 - 190
• Main Authors: Zheng, Lihui, Chen, Jinguo, Wan, Lingli, Zheng, Xinyu, Ke, Zongzhi
• Format: Journal Article
• Language: English
• Published: 01-04-2020
• ISSN: 0008-4042; 1480-3291
• DOI: 10.1139/cjc-2019-0343

A Perilla frutescens (L.) Britton activated carbon that had high specific surface area (HSAPFAC) was modified on the surface of the glassy carbon electrode (GCE) for preparing a HSAPFAC/GCE, and on this basis, a differential pulse voltammetry (DPV) method for the simultaneous determination of zinc and cadmium ions (Zn
2+
and Cd
2+
) was developed by using HSAPFAC/GCE. The determination conditions such as the film thickness, deposition potential, deposition time, and electrolyte acidity were investigated. The amperometric determination was carried out in a NaAc–HAc buffer solution (0.1 mol L
−1
, pH 5.5) after enriching for 550 s at –1.3 V. The oxidation peaks appear at –1.160 V and –0.845 V for Zn
2+
and Cd
2+
, respectively. The oxidation peak currents of Zn
2+
and Cd
2+
are proportional to their concentrations in the ranges of 0.5 ∼ 20 μg L
−1
and 0.25 ∼ 10 μg L
−1
, with the detection limits of 0.15 μg L
−1
and 0.01 μg L
−1
(signal/noise (S/N) = 3). The proposed method was applied to the determination of Zn
2+
and Cd
2+
in tap water samples. The recoveries were 101.6%∼103.0% and 84.0%∼88.8%, respectively.