期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 135, 期 1, 页码 381-387出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.09.009
关键词
FIA; Array of ultramicroelectrodes; Amperometric detection; Cell design
资金
- Spanish Ministry of Education and Science [CTQ2006-14385-C02-01/BQU]
- Generalitat of Catalonia [2005SGR00186]
Two prototypes of arrays of gold ultramicroelectrodes (Au-UMEA), with 5 and 10 mu m UME radii and steady-state response, have been tested as amperometric detectors in flow systems. Three prototypes of polymethyl methacrylate miniaturized flow cells have been especially designed and built for Au-UMEA devices. The performances of the different Au-UMEA/cell combinations have been tested, and the corresponding figures of merit determined by using three catecholamines as model compounds. Best results were obtained with the integration of the electrodes (Au-UMEA, reference and counter) as close as possible in a one-block cell. Moreover, the lifetime of Au-UMEAS is increased as compared with two-block cells. In general, the 5 mu m Au-UMEA electrode yields better limits of detection while the 10 mu m Au-UMEA covers a wider linear response range. (C) 2008 Elsevier B.V. All rights reserved.
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