一种直接测定复杂环境样品中铜的新型伏安法。

A novel voltammetric method for the direct determination of copper in complex environmental samples.

作者信息

Xia Jianjun, Wei Wanzhi, Hu Yanbo, Tao Han, Wu Ling

机构信息

State Key Laboratory of Chem/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, PR China.

出版信息

Anal Sci. 2004 Jul;20(7):1037-41. doi: 10.2116/analsci.20.1037.

DOI:10.2116/analsci.20.1037

PMID:15293398

Abstract

A novel voltammetry with a modified gold electrode for the direct determination of copper in environmental samples, without any pretreatment, is proposed in this paper. A porous disorganized monolayer was formed on the surface of the gold electrode by the self-assembly of mercaptoacetic acid (MAA), which could selectively permeate small molecules. Subtractive square wave anodic stripping voltammetry (SASV) was applied to determine copper, in which the underpotential deposition (UPD) of copper was used as the deposition step. The linear range was from 8 x 10(-7) to 1 x l0(-5) mol l(-1) by the modified electrode in the presence of human serum albumin, and the determination was not interfered with common metal ions. Copper in a real environmental sample was successfully detected.

摘要

本文提出了一种新型伏安法，使用修饰金电极直接测定环境样品中的铜，无需任何预处理。通过巯基乙酸（MAA）自组装在金电极表面形成了多孔无序单分子层，该单分子层可选择性渗透小分子。采用减法方波阳极溶出伏安法（SASV）测定铜，其中铜的欠电位沉积（UPD）用作沉积步骤。在人血清白蛋白存在下，修饰电极的线性范围为8×10⁻⁷至1×10⁻⁵ mol·L⁻¹，常见金属离子不干扰测定。成功检测了实际环境样品中的铜。