通过超阴极沉积提高悬汞滴电极阳极溶出伏安法的灵敏度。

Increased sensitivity of anodic stripping voltammetry at the hanging mercury drop electrode by ultracathodic deposition.

机构信息

Requimte-Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, no. 687, 4169-007 Porto, Portugal.

出版信息

Anal Chim Acta. 2011 Sep 9;701(2):152-6. doi: 10.1016/j.aca.2011.05.031. Epub 2011 Jun 22.

DOI:10.1016/j.aca.2011.05.031

PMID:21801881

Abstract

An improved approach to the anodic stripping voltammetric (ASV) determination of heavy metals, using the hanging mercury drop electrode (HMDE), is reported. It was discovered that using very cathodic accumulation potentials, at which the solvent reduction occurs (overpotential deposition), the voltammetric signals of zinc(II), cadmium(II), lead(II) and copper(II) increase. When compared with the classical methodology a 5 to 10-fold signal increase is obtained. This effect is likely due to both mercury drop oscillation at such cathodic potentials and added local convection at the mercury drop surface caused by the evolution of hydrogen bubbles.

摘要

本文报道了一种使用悬汞电极（HMDE）测定重金属的阳极溶出伏安法（ASV）的改进方法。研究发现，使用非常阴极的积累电位（过电势沉积），锌（II）、镉（II）、铅（II）和铜（II）的伏安信号增加。与经典方法相比，信号增加了 5 到 10 倍。这种效应可能是由于在如此阴极的电势下汞滴的振荡以及由氢气泡的析出引起的在汞滴表面增加的局部对流造成的。