Diamond, Dermot

Donohoe, Andrew

McCaul, Margaret

DCU Online Research Access Service

Cost Eﬀective Platform for Detection of Phosphate in Fresh and Marine Waters.Andrew Donohoe, Margaret McCaul, Dermot DiamondInsight Centre for Data Analytics, Dublin City University, IrelandThe nutrient platform utilises colorimetric chemistries for the d e t e c t i o n o f n u t r i e n t s i n waters.The platform is adaptable t o v a r i o u s c o l o r i m e t r i c chemistries for the detection of Phosphate (PO43-), Nitrite (NO2-) and Nitrate (NO3-).A two-layer PMMA microfluidic chip is integrated into the nutrient platform. The chip is comprised of two inlets and one outlet, a novel mixing pathway utilising shear forces for mixing and a 2cm Optical detection pathway.Optical detection is carried out through the use of a pulse width modulated LED and photodiode detector positioned between the optical pathway. Modification of LED wavelength al lows for detection of various analysesSensor Deployment Location53.356246, -6.360325999999986Nutrients such as Phosphate, Ammonia, Nitrite and Nitrate are central in any environmental processes, including several microbial, plant and animal metabolic processes. The nutrient platform is based on a combination of microfluidic analytical systems, colorimetric reagent chemistries, low cost LED based optical detection and wireless communications. Each component was developed, assessed and optimised to evaluate the suitability before being integrated to form a working pre-competitive prototype.River Liﬀey Water Levels  (21/02/2018- 21/03/2018)1000µMInternal and External Temperature (21/02/2018 - 27/02/2018)Rapid  PrototypingColorimetric  ChemistriesOptical DetectionMicrofluidicsA series of Rapid Prototyping techniques such as Laser ablation, 3D printing and precision micro milling are used to fabricate the nutrient platform. The use of these techniques allow for cost eﬀective prototyping. Nutrient Platform deployed along the River Liﬀey measuring Phosphate (PO43-) every 3 hoursThis Research is co-funded by the European Regional Development Fund (ERDF) under Ireland's European Structural and Investment Funds Programmes 2014-2020European UnionEuropean RegionalDevelopment FundPhosphate (PO43-) Detection Nutrient Platform vs Spectrometer • 636 Measurements recorded over 27 Days• Average Phosphate (PO43-) detected 13.0µM• Highest  PO43- concentration detected 31.2µM• Lowest PO43- concentration detected 0.1µMDeployment location River Liﬀey, Palmerstown, Dublin, Ireland Nutrient Platform Phosphate (PO43-) detection over a 27 day period (21/02/2018 - 20/03/2018) Nutrient Platform Phosphate (PO43-) detection at Milano San Rocco WWTP, Milan Nutrient Platform deployed after 2nd Stage Clarification at Milano San Rocco Waste Water Treatment PlantThe Nutrient Platform was deployed at Milan WWTP sampling every two hours for Phosphate (PO43-) after the second stage clarifier. 13 measurements total were taken over the deployment from the 4th to the 5th of MayBackground levels of approximately 20 - 25µM were measured during the deployment with one spike measured during an overflow of activated sludge within the plant as pictured.

Cost effective platform for detection of phosphate in fresh and marine waters.

Irish Universities

http://doras.dcu.ie/23247/1/Xenowac%20Poster%20Presentation%20-%20Andrew%20Donohoe.pdf

Cost effective platform for detection of phosphate in fresh and marine waters.

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Irish Universities