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Performance of Ex Situ Bismuth Film Rotating Disk Electrode in Trace Metal Analysis by Stripping Chronopotentiometry: Definition of the Depletion Regime and Optimization of Experimental Parameters
Author(s) -
Rocha Luciana S.,
Pereira E.,
Duarte A. C.,
Pinheiro José Paulo
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201100119
Subject(s) - bismuth , analytical chemistry (journal) , stripping (fiber) , metal , electrode , cadmium , detection limit , rotating disk electrode , materials science , chemistry , voltammetry , electrochemistry , metallurgy , environmental chemistry , cyclic voltammetry , chromatography , composite material
The potentiality of the ex situ deposited bismuth film electrode, allied to the rotation of a glassy carbon disk electrode (BiFE‐RDE), was exploited in trace metal analyses of lead(II) and cadmium(II) by stripping chronopotentiometry (SCP). A single BiFE (6.2 nm film thickness) can be used for a 1‐day term with no significant variation in the analytical signal. The limit of detection (3σ) for a deposition time of 40 s and an oxidation current of 15×10 −9 A was 1.5×10 −8 M for Pb(II) and 3.0×10 −8 M for Cd(II). BiFE‐RDE was successfully applied to the direct SCP determination of lead(II) in a fresh water certified material.