Pyridine-2-sulfonic (or carboxylic) acid modified glassy carbon electrode for anodic stripping voltammetry analysis of Cd2+ and Pb2+
Pyridine-2-sulfonic (or carboxylic) acid modified glassy carbon electrode for anodic stripping voltammetry analysis of Cd2+ and Pb2+
复制标题
吡啶-2-磺酸（或羧酸）修饰玻碳电极，用于阳极溶出伏安法分析 Cd2 和 Pb2
DOI：
10.1016/j.aca.2020.08.024
复制
发表时间：
2020
影响因子：
6.2
通讯作者：
Qingji Xie
中科院分区：
文献类型：
--
作者：
Hongbo Xiao;Wenlei Wang;Shaofeng Pi;Yan Cheng;Qingji Xie
制备了单层规模的吡啶-2-磺酸（PySA）或吡啶-2-羧酸（PyCA）修饰的玻碳电极（GCE），用于阳极溶出伏安法（ASV）分析Cd2+和Pb2+。通过在 0.5 M H2SO4 水溶液中电还原 PySA 或 PyCA，对 GCE 上的 PySA 或 PyCA 进行共价修饰，产生 PySA/GCE 或 PyCA/GCE。通过X射线光电子能谱和电化学技术对电极进行了表征。结合原位铋膜方法，PySA/GCE 和 PyCA/GCE 为 Cd2+ 和 Pb2+ 的 ASV 分析提供了非常高的分析性能，包括非常低的检测限值 (LOD,S/N= 3) 和高稳定性。 PySA/GCE 对 Cd2+ 的 LOD 为 4 ppt，对 Pb2+ 的 LOD 为 7 ppt。 PyCA/GCE 给出的 Cd2+ 检测限为 7 ppt，Pb2+ 检测限为 11 ppt。 Cu2+ 和 Ni2+ 干扰对于 Cd2+ 和 Pb2+ 的 ASV 分析仍然是一个挑战，我们发现在检测溶液中添加 K4Fe(CN)6 和 Ga(III) 可以很好地抑制这些干扰。使用该修饰电极对实际水样中的Cd2+和Pb2+进行分析，得到了满意的结果。
Monolayer-scale pyridine-2-sulfonic acid (PySA) or pyridine-2-carboxylic acid (PyCA) modified glassy carbon electrode (GCE) was prepared for anodic stripping voltammetry (ASV) analysis of Cd2+and Pb2+. PySA or PyCA was covalently modified on GCE by electroreduction of PySA or PyCA in 0.5 M aqueous H2SO4, yielding a PySA/GCE or PyCA/GCE. The electrodes were characterized by X-ray photoelectron spectroscopy and electrochemical techniques. In combination with the in-situ bismuth film method, both PySA/GCE and PyCA/GCE offered very high analytical performance for ASV analysis of Cd2+and Pb2+, including the very low values of limit of detection (LOD,S/N= 3) and high stability. The PySA/GCE gave a LOD of 4 ppt for Cd2+or of 7 ppt for Pb2+. The PyCA/GCE gave a LOD of 7 ppt for Cd2+or of 11 ppt for Pb2+. The Cu2+and Ni2+interferences, which still appear as a challenge for ASV analysis of Cd2+and Pb2+, were found to be well inhibited by the additions of K4Fe(CN)6and Ga(III) into the detection solution. The modified electrode was used for Cd2+and Pb2+analysis in real water samples with satisfactory results.