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dc.contributor.authorSuarez, Willian Toito
dc.contributor.authorFranco, Methewa O.K.
dc.contributor.authorCapitán Vallvey, Luis Fermín 
dc.contributor.authorErenas Rodríguez, Miguel María
dc.identifier.citationMicrochemical Journal 158 (2020) 105137es_ES
dc.description.abstractIn this work we propose a thread-based microfluidic device (μTAD) for the preconcentration and colorimetric determination of Co(II) in water using a digital image. The reaction is based on complexation of Co(II) by 4-(2- pyridylazo) resorcinol (PAR), which changes the detection zone from yellow to red. PAR is immobilized in a chitosan membrane to retain the complex in the detection zone. The designed μTAD makes it possible to pre- concentrate and determine cobalt between 25 and 600 µg·L−1 with a relative standard deviation of 4% (n = 5), and a detection limit of 6.5 µg·L−1. The device permits an enhancement factor of 11 by combining the use of a chitosan retention membrane and a sample volume of 50 µL. Recovery experiments were performed in tap water to evaluate the accuracy of the method, and the results obtained compared to a reference method presents an error no higher than 5.7%es_ES
dc.description.sponsorshipThis work was founded by Spanish “Ministerio de Economía y Competitividad” under Project CTQ2016-78754-C2-1-R and Junta de Andalucía under Projects B-FQM-243-UGR18 and P18-RT-2961. The project was partially supported by European Regional Development Funds (ERDF). Supporting Research in the State of Minas Gerais (Fapemig) (CEX-APQ-02436-15).es_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subjectThread-based microfluidic devicees_ES
dc.subjectDigital image analysises_ES
dc.subjectCobalt determinationes_ES
dc.titleChitosan-modified cotton thread for the preconcentration and colorimetric trace determination of Co(II)es_ES

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Atribución-NoComercial-SinDerivadas 3.0 España
Except where otherwise noted, this item's license is described as Atribución-NoComercial-SinDerivadas 3.0 España