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Autonomous reagent-based microfluidic pH sensor platform

Perez de Vargas Sansalvador, Isabel M.; Fay, Cormac D.; Cleary, John; Nightingale, Adrian M.; Mowlem, Matthew C.; Diamond, Dermot. 2016 Autonomous reagent-based microfluidic pH sensor platform. Sensors and Actuators B: Chemical, 225. 369-376. 10.1016/j.snb.2015.11.057

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[img] Text (Main paper)
© 2016 Elsevier B.V. This is the author’s version of a work that was accepted for publication in Sensors and Actuators B: Chemical. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was/will be published in Sensors and Actuators B: Chemical(doi:10.1016/j.snb.2015.11.057)
pH paper_AQUAWARN.DOCX - Accepted Version

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[img] Text (Abstract)
© 2016 Elsevier B.V. This is the author’s version of a work that was accepted for publication in Sensors and Actuators B: Chemical. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was/will be published in Sensors and Actuators B: Chemical(doi:10.1016/j.snb.2015.11.057)
abstract_Aquawarn.doc - Accepted Version

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[img] Text (Supplementary information)
© 2016 Elsevier B.V. This is the author’s version of a work that was accepted for publication in Sensors and Actuators B: Chemical. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was/will be published in Sensors and Actuators B: Chemical(doi:10.1016/j.snb.2015.11.057
Supplementary Information pH paper.docx - Accepted Version

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Abstract/Summary

A portable sensor has been developed for in situ measurements of pH within aqueous environments. The sensor design incorporates microfluidic technology, allowing for the use of low volume of samples and reagents, and an integrated low cost detection system that uses a light emitting diode as light source and a photodiode as the detector. Different combination of dyes has been studied in order to allow for a broader pH detection range, than can be obtained using a single dye. The optimum pH range for this particular dye combination was found to be between pH 4 and pH 9. The reagents developed for pH measurement were first tested using bench-top instrumentation and once optimised, the selected formulation was then implemented in the microfluidic system. The prototype system has been characterised in terms of pH response, linear range, reproducibility and stability. Results obtained using the prototype system are in good agreement with those obtained using reference instrumentation, i.e. a glass electrode/pH meter and analysis via spectrophotometer based assays. The reagent (mixture #3) is shown to be stable for over 8 months, which is important for long term deployments. A high reproducibility is reported with a global RSD of ≤1.8% across measurements of 90 samples, i.e. with respect to concentrations reported by a calibrated pH meter. A series of real water samples from multiple sources were also analysed using the portable sensor system, of which the global error found was 3.84% showing its feasibility for real-world applications.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.snb.2015.11.057
ISSN: 09254005
Additional Keywords: Microfluidic system; pH sensor; Water analysis; Autonomous monitoring
Date made live: 04 Feb 2016 14:09 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/512858

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