Nitrate detection at Nafion-modified electrodes incorporating ytterbium and uranyl electrocatalysts
✍ Scribed by P. Ugo; L. M. Moretto; B. Ballarin
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 300 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1040-0397
No coin nor oath required. For personal study only.
✦ Synopsis
The performances of Nafion-coated thin mercury film electrodes and Nafion-coated glassy carbon electrodes loaded in aqueous solutions of Yb3+ or UO?, respectively, are examined in relation to their use for the electrocatalytic voltammetric detection of nitrate.
Electrocatalytic reaction between the incorporated, reduced species, namely Yb2+ and U3+, and the NO, substrate is observed in both cases; however, the rapid inactivation of the ytterbium-based sensor prevents its use for practical purposes. More promising results were obtained for the uranyl-based sensor, since a more stable, modified electrode is obtained which can be used for the detection of nitrate in the 2-400 ~L M concentration range; however, problems connected to the slow release of the catalyst from the coating remain to be solved. Finally, the limitations and possible development of such a voltammetric sensor are critically discussed.