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A centrifugal lab-on-a-disc device for the in situ determination of dissolved reactive phosphate in water.

Duffy, Gillian and Heery, Brendan and Maguire, Ivan and Nwankire, Charles and Ducrée, Jens and Regan, Fiona (2015) A centrifugal lab-on-a-disc device for the in situ determination of dissolved reactive phosphate in water. In: EuroAnalysis 2015, 6-10 Sept 15, Bordeaux, France.

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Abstract

Phosphorus (P) is an important nutrient to monitor in natural waters as it is a growth limiting nutrient. When levels of phosphorus are elevated, excessive growth of algae occurs. This can lead to hypoxic or anoxic waters, potential release of harmful toxins and it impacts negatively on the ecosystem. Phosphorus measurement in water involves the collection of grab samples, transport and storage of samples, and analysis using expensive analytical instrumentation. This is costly, time and labour intensive and is carried out infrequently as a result. In this work, P is measured as soluble reactive phosphate (SRP), to give an indication of P levels in fresh water. A device for in situ analysis of SRP was fabricated. This device consists of a centrifugal microfluidic lab-on-a-disc platform, with a housing unit. The disc operates by mixing the sample with ascorbic acid method reagents using centrifugal force. The coloured product is presented to an optical detection system consisting of a laser and photodiode. The limit of detection has been optimised by modification of the optical path length. The housing unit is a 3D printed portable box with a built in motor for disc rotation. This box also houses the optical detection system which consists of a laser and photodiode. The box facilitates the alignment of the detection system with the optical pathway of the disc for absorbance measurements in an environment free from ambient light. This device allows for rapid analysis times, compactness, ease of use, low cost analyses and low reagent consumption. Keywords: Phosphate, microfluidics, lab-on-a-disc, optical sensor

Item Type:Conference or Workshop Item (Speech)
Event Type:Conference
Refereed:No
Subjects:Physical Sciences > Analytical chemistry
Biological Sciences > Microfluidics
Physical Sciences > Chemical detectors
Physical Sciences > Environmental chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > Marine and Environmental Sensing Technology Hub (MESTECH)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Official URL:http://www.euroanalysis2015.com/
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:20826
Deposited On:16 Sep 2015 10:43 by Gillian Duffy. Last Modified 13 Jan 2017 15:39

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