Integration of a sensitive carbon nanotube composite electrode in a ceramic microanalyzer for the amperometric determination of free chlorine

Rosa Olivé-Monllau, Cynthia S. Martínez-Cisneros, Jordi Bartrolí, Mireia Baeza, Francisco Céspedes

Research output: Contribution to journalArticleResearchpeer-review

24 Citations (Scopus)

Abstract

In this paper we report a green tape ceramic microfluidic analyzer that integrates a complete amperometric detection system based on a highly sensitive carbon nanotube composite electrode. As a proof of the integration concept, reference and counter electrodes were embedded into the microanalyzer body during the fabrication process. In order to increase the system functionality, and taking advantage of the surface renewability associated with composite electrodes, the working electrode was integrated in an exchangeable configuration. The microanalyzer was automated by means of the multicommutation technique, which allowed its autocalibration by the on-line preparation of standard solutions from a unique stock solution. The system was applied to the analysis of free chlorine in water samples. A noticeable low detection limit (0.05 mg L-1) and a high-term stability were observed. To demonstrate the potentiality of this approach, in terms of analytical performance, it was also applied to the analysis of real samples obtained from a public swimming pool. The system characteristics make it ideal for unattended applications where the minimum user interaction and the maximum analyzer autonomy are required. © 2010 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)416-422
JournalSensors and Actuators, B: Chemical
Volume151
Issue number2
DOIs
Publication statusPublished - 28 Jan 2011

Keywords

  • Amperometric sensor
  • Carbon nanotube composite
  • Chlorine
  • Green tape ceramics
  • Microanalyzer

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