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Sensors 2018, 18(9), 2883; https://doi.org/10.3390/s18092883

Development of Colorimetric and Ratiometric Fluorescence Membranes for Detection of Nitrate in the Presence of Aluminum-Containing Compounds

1
School of Chemical Engineering and Research Center for Biophotonics, Chonnam National University, Yong-Bong Ro 77, Gwangju 61186, Korea
2
AquaTech Co., Ltd. 13 Yeongtong-ro 525 beon-gil, Yeongtong-Gu, Suwon 16706, Korea
*
Author to whom correspondence should be addressed.
Received: 18 July 2018 / Revised: 21 August 2018 / Accepted: 29 August 2018 / Published: 31 August 2018
(This article belongs to the Special Issue Colorimetric and Fluorescent Sensors 2018)
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Abstract

In this study, a quantitative analysis of nitrate in aqueous solution was performed through the combination of an oxazine170 perchlorate–ethyl cellulose (O17-EC) membrane with aluminum-containing compounds. Aluminum of Devarda’s alloy (DA) or a clay hydrotalcite (HT) was employed for the reduction of nitrate to produce ammonia, and the produced ammonia was detected by the O17-EC membrane. The method of combining the O17-EC membrane with aluminum compounds has showed a broad detection range of nitrate. That is, the DA was combined with the O17-EC membrane and showed the linear nitrate detection ranges of 1–10 mM and 10–100 mM, while the O17-EC membrane immobilized with the clay HT showed a linear detection range of 0.1–1 mM nitrate. The visual color transition of the nitrate-sensing membranes at different nitrate concentrations was clearly observed under sunlight or irradiation of a light-emitting diode (LED) at an excitation wavelength of 470 nm (LED470). View Full-Text
Keywords: oxazine–ethyl cellulose membrane; Devarda’s alloy; clay hydrotalcite; Nitrate detection; colorimetric and ratiometric fluorescence detection oxazine–ethyl cellulose membrane; Devarda’s alloy; clay hydrotalcite; Nitrate detection; colorimetric and ratiometric fluorescence detection
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Duong, H.D.; Kim, H.L.; Rhee, J.I. Development of Colorimetric and Ratiometric Fluorescence Membranes for Detection of Nitrate in the Presence of Aluminum-Containing Compounds. Sensors 2018, 18, 2883.

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