Department of Pharmacy, Faculty of Medicine, University of Banja Luka.
Republic Institute for the Protection of Cultural Monuments of Serbia.
Anal Sci. 2021 Feb 10;37(2):353-358. doi: 10.2116/analsci.20P302. Epub 2020 Oct 2.
This paper describes the determination of Pb and Cu with a Nafion-modified glassy carbon electrode and MnCoO nanoparticles as working electrode for anodic stripping voltammetry. Pb and Cu were accumulated in HCl/KCl (0.1 mol dm) at a potential of -1.4 V (vs. Ag/AgCl electrode) for 480 s, followed by a linear sweep anodic stripping voltammetry (ASV) scan from -1.0 to +0.5 V. Under optimum conditions, the calibration curves were linear in the range of 0.01 - 8 and 0.01 - 5 mg dm for Pb and Cu, respectively. Effect of sample dilution, accumulation time and potential were optimized. A study of interfering substances was performed. A significant increase in current was obtained at the modified electrode in comparison with the bare glassy carbon electrode. The modified electrode was successfully applied for determination of Pb and Cu in wine samples after a simple preparation procedure. Pb and Cu content in wine was used for estimation of the target hazard quotient (THQ) values for minimal and maximal levels of the metals.
本文描述了使用 Nafion 修饰的玻碳电极和 MnCoO 纳米粒子作为工作电极，通过阳极溶出伏安法测定 Pb 和 Cu 的方法。在 -1.4 V（相对于 Ag/AgCl 电极）的电位下，将 Pb 和 Cu 在 HCl/KCl（0.1 mol dm）中累积 480 s，然后进行从 -1.0 到 +0.5 V 的线性扫面阳极溶出伏安法（ASV）扫描。在最佳条件下，Pb 和 Cu 的校准曲线分别在 0.01-8 和 0.01-5 mg dm 的范围内呈线性。优化了样品稀释、累积时间和电位的影响。对干扰物质进行了研究。与裸玻碳电极相比，在修饰电极上获得了电流的显著增加。经过简单的制备程序，该修饰电极成功地应用于葡萄酒样品中 Pb 和 Cu 的测定。利用葡萄酒中 Pb 和 Cu 的含量，估算了金属最低和最高水平的目标危害商（THQ）值。
