A5.2 - Studies of Adsorption and Complexation of Copper and Lead with Environmental Relevance with an Electrochemical Quartz Crystal Nanobalance

Event
AMA Conferences 2013
2013-05-14 - 2013-05-16
Nürnberg
Band
Proceedings SENSOR 2013
Chapter
A5 - Mircoacoustic Sensors
Author(s)
M. Gomes, A. Yamasaki, J. Oliveira - University of Aveiro (Portugal)
Pages
111 - 116
DOI
10.5162/sensor2013/A5.2
ISBN
978-3-9813484-3-9
Price
free

Abstract

Electrochemical methods when performed on an electrode of a piezoelectric quartz crystal can give extra information on mass deposited and stripped from the electrode. Current and mass give complementary information about the electrochemical phenomena. Reagent and products adsorption, as well as the importance of transport mechanisms as diffusion, can be easily perceived by following one or both variables. The examples here shown of voltammetric methods performed on copper and lead solutions, using one of the gold electrodes of a piezoelectric quartz crystal as the working electrode, illustrate the power of technique. Besides, it is demonstrated that the mass monitorization allows following non-faradaic processes, as complexation between lead and humic acids. On the other hand, data simplification can be obtained by rendering invisible, for instance, proton reduction. Anodic stripping voltammetry is useful to decrease detection limits, due to the addition of the electrochemical pre-concentration step, and mass, as well as current, could be used for quantitative purposes. An
environmental study of copper levels on the water of a lagoon shows the potential of the technique by reaching the ppb level.

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