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Autonomous microfluidic analyser for wastewater monitoring

Cleary, John and Maher, Damien and Carroll, Gary and Diamond, Dermot (2011) Autonomous microfluidic analyser for wastewater monitoring. In: SWIG Conference - Sensing in Water 2011, 21-22 Sept 2011, Nottingham, UK.

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Abstract

An autonomous microfluidic analyser for phosphate in wastewater and environmental waters has been developed and validated in laboratory and field trials. The analyser is based on the molybdenum yellow method for phosphate detection in which a phosphate-containing sample is mixed with a reagent containing ammonium molybdate and ammonium metavanadate in an acidic medium. The yellow-coloured compound which is formed absorbs strongly below 400nm and its absorbance is proportional to the concentration of phosphate in the original sample. The analyser utilizes a microfluidic manifold where mixing, reaction and detection take place. Optical detection is performed using a LED (light emitting diode) light source and a photodiode detector, while wireless communications allow near real-time access to the collected data. The analyser also combines pumping system, power supply, reagent and waste storage, and wireless communications into a compact and portable device. The system has been successfully applied to analysis of treated wastewater at a treatment plant in Co. Kildare, Ireland. In parallel with this work, detection schemes for other targets (ammonia, nitrate/nitrite, pH) have been assessed, with the goal of developing a low cost, field deployable multi-analyte detection system. Utilising colorimetric chemistry and LED-based detection systems allows a modular approach which facilitates integration of the new detection schemes with the hardware platform provided by the phosphate sensor.

Item Type:Conference or Workshop Item (Invited Talk)
Event Type:Conference
Refereed:No
Uncontrolled Keywords:environmental sensing
Subjects:Physical Sciences > Analytical chemistry
Physical Sciences > Chemical detectors
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Enterprise Ireland, Science Foundation Ireland
ID Code:16755
Deposited On:18 Jan 2012 10:55 by John Cleary. Last Modified 18 Jan 2012 10:55

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