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 |
| |
| Authors: | Luciana S Rocha E Pereira A C Duarte José Paulo Pinheiro |
| |
| Institution: | 1. Department of Chemistry/CESAM, University of Aveiro, 3810‐193 Aveiro, Portugal;2. Department of Chemistry and Biochemistry/CBME, University of Algarve, Faculty of Sciences, 8005‐139 Faro, Portugal |
| |
| Abstract: | 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. |
| |
| Keywords: | Bismuth film electrode Thin mercury film electrode Stripping chronopotentiometry Heavy metals Fresh water |
|
|
