ISSN:
1040-0397
Keywords:
Nitrate
;
Nafion
;
Ytterbium
;
Uranyl
;
Electrocatalysis
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The performances of Nafion-coated thin mercury film electrodes and Nafion-coated glassy carbon electrodes loaded in aqueous solutions of Yb3+ or UO22+, 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 NO3-, 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 μM 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.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140070206
Permalink