Author ORCID Identifier
https://orcid.org/0000-0003-1544-5152
Document Type
Article
Rights
Available under a Creative Commons Attribution Non-Commercial Share Alike 4.0 International Licence
Disciplines
1.4 CHEMICAL SCIENCES
Abstract
In deionised water, ascorbic acid (AH−), through oxidation by oxygen in the presence of copper(II), was found to degrade with zero-order kinetics. The magnitude of the reaction rate varied directly with the copper(II) concentration. At a higher pH (7.4), the same reaction was found to be pseudo-first order. Once again, the magnitude of the rate increased linearly with copper(II) concentration at a micromolar level. Dissolved oxygen levels, in excess AH− and trace copper(II), displayed similar kinetics under both conditions. Monitoring of either AH− levels or dissolved oxygen concentration was found to be a useful novel undergraduate practical laboratory for trace copper(II) determination. Students can measure the kinetics for standards and their unknown copper solution and quantitate the unknown copper.
DOI
https://doi.org/10.1071/CH22164
Recommended Citation
Tobin Sean, Cassidy John, Kurian Kevin, Betts Anthony (2022) Analysis of copper(II) using the ascorbate/oxygen system – a valuable undergraduate resource. Australian Journal of Chemistry 75, 835-838. DOI: 10.1071/CH22164
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 4.0 International License.
Publication Details
Authors' accepted version.
Published in the Australian Journal of Chemistry (CSIRO Publishing)