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Issue 18, 2013

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

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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 (λmax = 430 nm). The modified method allows for nitrate determination over the linear range 0.9–80 mg L−1 nitrate with a limit of detection of 0.73 μg L−1 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.

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

Article information


Submitted
03 Jul 2013
Accepted
17 Jul 2013
First published
17 Jul 2013

Anal. Methods, 2013,5, 4798-4804
Article type
Paper

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

D. Cogan, J. Cleary, T. Phelan, E. McNamara, M. Bowkett and D. Diamond, Anal. Methods, 2013, 5, 4798 DOI: 10.1039/C3AY41098F

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