Potentiometric analytical microsystem based on the integration of a gas-diffusion step for on-line ammonium determination in water recycling processes in manned space missions

Antonio Calvo-López, Oriol Ymbern, Mar Puyol, Joan Manel Casalta, Julián Alonso-Chamarro

Research output: Contribution to journalArticleResearchpeer-review

14 Citations (Scopus)

Abstract

© 2014 Elsevier B.V. The design, construction and evaluation of a versatile cyclic olefin copolymer (COC)-based continuous flow potentiometric microanalyzer to monitor the presence of ammonium ion in recycling water processes for future manned space missions is presented. The microsystem integrates microfluidics, a gas-diffusion module and a detection system in a single substrate. The gas-diffusion module was integrated by a hydrophobic polyvinylidene fluoride (PVDF) membrane. The potentiometric detection system is based on an all-solid state ammonium selective electrode and a screen-printed Ag/AgCl reference electrode. The analytical features provided by the analytical microsystem after the optimization process were a linear range from 0.15 to 500mgL-1 and a detection limit of 0.07±0.01mgL-1. Nevertheless, the operational features can be easily adapted to other applications through the modification of the hydrodynamic variables of the microfluidic platform.
Original languageEnglish
Pages (from-to)26-32
JournalAnalytica Chimica Acta
Volume874
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • Ammonium ion
  • Gas-diffusion
  • Lab on a chip
  • Miniaturization
  • Polymer technology
  • Potentiometric detection

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