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Sensors 2017, 17(10), 2345;

Low Cost Lab on Chip for the Colorimetric Detection of Nitrate in Mineral Water Products

Department of Pharmaceutical and Chemical Engineering, School of Applied Medical Sciences, German Jordanian University, P.O. Box 35247, Amman 11180, Jordan
NanoLab, School of Applied Technical Sciences, German Jordanian University, P.O. Box 35247, Amman 11180, Jordan
Author to whom correspondence should be addressed.
Received: 7 August 2017 / Revised: 20 September 2017 / Accepted: 27 September 2017 / Published: 14 October 2017
(This article belongs to the Special Issue Fluorescent Probes and Sensors)
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The diagnostics of health status and the quality of drinking water are among the most important United Nations sustainable development goals. However, in certain areas, wars and instability have left millions of people setting in refugee camps and dangerous regions where infrastructures are lacking and rapid diagnostics of water quality and medical status are critical. In this work, microfluidic testing chips and photometric setups are developed in cheap and portable way to detect nitrate concentrations in water. The performed test is designed to work according to the Griess procedure. Moreover, to make it simple and usable in areas of low resource settings, commercially available Arduino mega and liquid crystal display (LCD) shield are utilized to process and display results, respectively. For evaluation purposes, different local products of tap water, bottled drinking water, and home-filter treated water samples were tested using the developed setup. A calibration curve with coefficient of determination (R2) of 0.98 was obtained when absorbance of the prepared standard solutions was measured as a function of the concentrations. In conclusion, this is the first step towards a compact, portable, and reliable system for nitrate detection in water for point-of-care applications. View Full-Text
Keywords: colorimetric; microfluidic; sensor; LOC colorimetric; microfluidic; sensor; LOC

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Khanfar, M.F.; Al-Faqheri, W.; Al-Halhouli, A. Low Cost Lab on Chip for the Colorimetric Detection of Nitrate in Mineral Water Products. Sensors 2017, 17, 2345.

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