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Integrated flow analysis platform for the direct detection of nitrate in water using a simplified chromotropic acid method

Cogan , Deirdre and Cleary, John and Phelan, Thomas and McNamara, Eoghan and Bowkett, Mark and Diamond, Dermot (2013) Integrated flow analysis platform for the direct detection of nitrate in water using a simplified chromotropic acid method. RSC Analytical Methods, 2013 (5). pp. 4798-4804. ISSN 1759-9660

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Abstract

This work describes the first use of a direct nitrate analyser using chromotropic acid. A simplified chromotropic acid method eliminating several steps previously associated with this method is employed in the platform. In a sulphuric acid medium, chromotropic acid reacts with nitrate ions and produces a characteristic yellow colour associated with an absorbance band in the visible region (430 nm).The modified method allows for nitrate determination over the linear range 0.9–80 mg/L nitrate with a limit of detection of 0.73 mg/L nitrate. Validation was achieved by analysing water samples from various sources including groundwater, trade effluent and drinking water by the modified method and by ion chromatography. The method was implemented on a flow analysis platform incorporating a paired emitter–detector diode (PEDD) as the optical detector. An excellent correlation coefficient of 0.993 was obtained between the modified method and ion chromatography. The modified chromotropic acid method represents a rapid, simple, low cost technique for the direct determination of nitrate in water.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:chemical sensors; water monitoring; nitrate; chromotropic acid
Subjects:Physical Sciences > Analytical chemistry
Physical Sciences > Environmental chemistry
Engineering > Environmental engineering
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Publisher:RSC Publishing
Official URL:http://pubs.rsc.org/en/content/articlepdf/2013/ay/c3ay41098f
Copyright Information:© 2013 RSC
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:QUESTOR
ID Code:19025
Deposited On:02 Oct 2013 11:46 by Deirdre Cogan. Last Modified 12 Jan 2017 15:15

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