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A microfluidic platform for multi-parametric water quality analysis

Cleary, John and Maher, Damien and Cogan, Deirdre and Diamond, Dermot (2012) A microfluidic platform for multi-parametric water quality analysis. In: ICEST 2012 – the 6th International Conference on Environmental Science and Technology 2012, 25-29 June 2012, Houston, USA.

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A microfluidic analyser platform for a number of key water quality parameters has been developed. The platform utilises colorimetric reagent chemistry for detection and quantification of phosphate, nitrate, pH and chemical oxygen demand (COD). The system integrates microfluidic analytical systems, optical detection systems, and wireless communications into a low-cost, portable device capable of autonomous operation under environmental conditions for extended periods. The platform has been successfully tested and validated under various conditions including deployments in freshwater, estuarine water and municipal wastewater. The system uses the vanadomolybophosphoric acid method for phosphate detection, the chromotropic acid method for nitrate detection, a combination of pH indicators for pH measurement, and a variation of the standard method using dichromate for COD analysis. In each case a colour change is developed after mixing the water sample with a reagent (or combination of reagents) in a microfluidic manifold where mixing and reaction take place. The colour change is detected using a light emitting diode (LED) and photodiode based optical detector, allowing quantification of the target analyte in the original sample. Data is stored on a Flash memory chip and also transmitted to the user via wireless communications. Wireless communication modes such as GSM or ZigBee radio are chosen according to the specific application in question. In this paper we describe the design and operation of the analyser platform and present data from laboratory and field trials of the system.

Item Type:Conference or Workshop Item (Paper)
Event Type:Conference
Subjects:Physical Sciences > Analytical chemistry
Physical Sciences > Chemical detectors
Physical Sciences > Environmental chemistry
Physical Sciences > Chemistry
DCU Faculties and Centres:Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland, Enterprise Ireland
ID Code:17253
Deposited On:28 Aug 2012 10:53 by John Cleary. Last Modified 17 Feb 2017 11:14

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