Multi-parametric polymer-based potentiometric analytical microsystem for future manned space missions
Calvo-Lopez, Antonio (Universitat Autònoma de Barcelona. Departament de Química)
Puyol Bosch, M. del Mar (Universitat Autònoma de Barcelona. Departament de Química)
Casalta, Joan Manel (SENER)
Alonso Chamarro, Julián (Universitat Autònoma de Barcelona. Departament de Química)

Data:	2017
Resum:	The construction and evaluation of a Cyclic Olefin Copolymer (COC)-based continuous flow potentiometric microanalyzer to simultaneously monitor potassium, chloride and nitrate ions in samples from an on-board water recycling process expected to be installed in future manned space missions is presented. The main goals accomplished in this work address the specific required characteristics for a miniaturized on-line monitoring system to control water quality in such missions. To begin with, the integration of three ion-selective electrodes (ISEs) and a reference electrode in a compact microfluidic platform that incorporates a simple automatic autocalibration process allows obtaining information about the concentration of the three ions with optimal analytical response characteristics, but moreover with low reagents consumption and therefore with few waste generation, which is critical for this specific application. By a simple signal processing (signal removal) the chloride ion interference on the nitrate electrode response can be eliminated. Furthermore, all fluidics management is performed by computer-controlled microvalves and micropumps, so no manual intervention of the crew is necessary. The analytical features provided by the microsystem after the optimization process were a linear range from 6. 3 to 630 mg L-1 and a detection limit of 0. 51 mg L-1 for the potassium electrode, a linear range from 10 to 1000 mg L-1 and a detection limit of 1. 58 mg L-1 for the chloride electrode and a linear range from 10 to 1000 mg L-1 and a detection limit of 3. 37 mg L-1 for the nitrate electrode with a reproducibility (RSD) of 4%, 2% and 3% respectively. Sample throughput was 12 h-1 with a reagent consumptions lower than 2 mL per analysis.
Ajuts:	Ministerio de Ciencia e Innovación CTQ2009-12128 Ministerio de Ciencia e Innovación CTQ2012-36165
Drets:	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.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Lab on a chip ; Miniaturization ; Multi-parametric ; Polymer technology ; Potentiometric detection ; Space applications ; SDG 12 - Responsible Consumption and Production
Publicat a:	Analytica chimica acta, Vol. 995 (December 2017) , p. 77-84, ISSN 1873-4324

DOI: 10.1016/j.aca.2017.08.043

Postprint 28 p, 1.3 MB

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