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

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Jose A Rodrigues (Author) FCUP; Carlos M Rodrigues (Author) Other; Paulo J Almeida (Author) FCUP; Ines M Valente (Author) Other; Luis M Goncalves (Author) Other; Richard G Compton (Author) Other; Aquiles A Barros (Author) FCUP

Journal

Title: Analytica Chimica Acta

Vol. 701

Pages: 152-156

ISSN: 0003-2670

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 47 Citations

Scopus - 51 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-002-MKY

DOI: 10.1016/j.aca.2011.05.031

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5