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
Calvo-Lopez, Antonio (Universitat Autònoma de Barcelona. Departament de Química)
Ymbern, Oriol (Universitat Autònoma de Barcelona. Departament de Química)
Puyol Bosch, M. del Mar (Universitat Autònoma de Barcelona. Departament de Química)
Casalta, Joan Manel (NTE-SENER)
Alonso Chamarro, Julián (Universitat Autònoma de Barcelona. Departament de Química)

Date:	2015
Abstract:	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.
Grants:	Ministerio de Ciencia e Innovación CTQ2009-12128 Ministerio de Ciencia e Innovación CTQ2012-36165
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Ammonium ion ; Gas-diffusion ; Lab on a chip ; Miniaturization ; Polymer technology ; Potentiometric detection
Published in:	Analytica chimica acta, Vol. 874 (May 2015) , p. 26-32, ISSN 1873-4324

DOI: 10.1016/j.aca.2014.12.038

Postprint 25 p, 1.6 MB

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