Compact and autonomous multiwavelength microanalyzer for in-line and in-situ colorimetric determinations

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dc.contributor.author Mendes daRocha, Zaira
dc.contributor.author Martínez Cisneros, Cynthia Susana
dc.contributor.author Seabra, Antonio Carlos
dc.contributor.author Valdés, Francisco
dc.contributor.author Gongora Rubio, Mario Ricardo
dc.contributor.author Alonso-Chamarro, Julian
dc.date.accessioned 2018-05-11T10:32:56Z
dc.date.available 2018-05-11T10:32:56Z
dc.date.issued 2012
dc.identifier.bibliographicCitation Mendes daRocha, Z., Martínez-Cisneros, C.S., Seabra, A.C., Valdés, F., Gongora-Rubio, M.R., Alonso-Chamarro, J. (2012). Compact and autonomous multiwavelength microanalyzer for in-line and in-situ colorimetric determinations. Lab on a Chip, 12 (1), pp. 109-117
dc.identifier.issn 1473-0197
dc.identifier.uri http://hdl.handle.net/10016/26638
dc.description.abstract Nowadays, the attainment of microsystems that integrate most of the stages involved in an analytical process has raised an enormous interest in several research fields. This approach provides experimental set-ups of increased robustness and reliability, which simplify their application to in-line and continuous biomedical and environmental monitoring. In this work, a novel, compact and autonomous 10 microanalyzer aimed at multiwavelength colorimetric determinations is presented. It integrates the microfluidics (a three-dimensional mixer and a 25 mm length "Z-shape" optical flow-cell), a highly versatile multiwavelength optical detection system and the associated electronics for signal processing and drive, all in the same device. The flexibility provided by its design allows the microanalyzer to be operated 15 either in single fixed mode to provide a dedicated photometer or in multiple wavelength mode to obtain discrete pseudospectra. To increase its reliability, automate its operation and allow it to work under unattended conditions, a multicommutation sub-system was developed and integrated to the experimentalset-up. The device was initially evaluated in the absence of chemical reactions using four acidochromic dyes and later applied to determine some key environmental parameters such as phenol index, chromium 20 (VI) and nitrite ions. Results were comparable with those obtained with commercial instrumentation and allowed to demonstrate the versatility of the proposed microanalyzer as an autonomous and portable device able to be applied to other analytical methodologies based on colorimetric determinations.
dc.description.sponsorship The authors would like to acknowledge the Spanish, Brazilian and Mexican authorities and agencies for its financial support through projects CTQ2009-12128, CONSOLIDER INGENIO2010-CSD2006-12, PHB2010-0064-PC (MEC-50 CAPES) and P509AC0376 (CYTED). Z.M da Rocha would like to acknowledge FAPESP (Project 2009/08486-4) for their financial support.
dc.format.extent 18
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Royal Society of Chemistry
dc.rights © Royal Society of Chemistry, 2012
dc.title Compact and autonomous multiwavelength microanalyzer for in-line and in-situ colorimetric determinations
dc.type article
dc.subject.eciencia Química
dc.identifier.doi https://doi.org/10.1039/C1LC20747D
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. PHB2010-0064-PC
dc.relation.projectID Gobierno de España. CSD2006-12
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 109
dc.identifier.publicationlastpage 117
dc.identifier.publicationtitle Lab on a Chip
dc.identifier.publicationvolume 12
dc.identifier.uxxi AR/0000021082
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