Towards an autonomous microfluidic sensor for dissolved carbon dioxide determination
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AuthorPérez de Vargas Sansalvador, Isabel María; López Ruiz, Nuria; Erenas Rodríguez, Miguel María; Capitán Vallvey, Luis Fermín; Coleman, Simon; Diamond, Dermot; Fernández Ramos, María Dolores
CO2 sensorMicrofluidicsWater analysisAutonomous monitoringCarbon dioxide
Isabel M. Perez de Vargas Sansalvador, Nuria Lopez Ruiz, M.M. Erenas, Luis Fermin Capitan Vallvey, Simon Coleman, Dermot Diamond, Maria Dolores Fernandez Ramos , Towards an autonomous microfluidic sensor for dissolved carbon dioxide determination Microchemical Journal Volume 139, June 2018, Pages 216-221
SponsorshipTalentia Postdoc Program launched by the Andalusian Knowledge Agency, co-funded by the European Union’s Seventh Framework Program, Marie Skłodowska-Curie actions (COFUND – Grant Agreement nº 267226); European Union's Horizon 2020 research and innovation programme under grant agreement No 706303 (Multisens); Spanish MINECO (CTQ2016-78754-C2-1-R); Unidad de Excelencia de Química aplicada a biomedicina y medioambiente of the University of Granada; Science Foundation Ireland (INSIGHT Centre, Grant Number SFI/12/RC/2289); European Union (FP7 NAPES project, Project ID: 604241)
In this work, we present a new system for the determination of dissolved carbon dioxide (from 7.2 ppm to 425.6ppm) in aqueous environments. Microfluidic technology has been incorporated in sensor design to reduce the volume of samples and reagents. Moreover, a detection system has been integrated in the chip, consisting of a white light-emitting diode as a light source and a high-resolution digital colour sensor as the detector, which are able to detect changes in colour produced by the reaction of the sensing chemistry and carbon dioxide in water. The optimised parameters found for the system are: flow rate 0.6 mL·min-1, integration time 30 s and the time for pumping of solutions was 3 min, obtaining a LOD of 7.2 ppm. The CO2 response, reproducibility, precision, and stability of the sensing chemistry have been studied and compared with those obtained using benchtop instrumentation (i.e. a spectrophotometer), obtaining good agreement.