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Sensors 2019, 19(2), 247; https://doi.org/10.3390/s19020247

A Sensitive Near-Infrared Fluorescent Probe for Detecting Heavy Metal Ag+ in Water Samples

1
College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 210000, China
2
Changzhou Vocational Institute of Engineering, Changzhou 213100, China
*
Author to whom correspondence should be addressed.
Received: 24 December 2018 / Revised: 7 January 2019 / Accepted: 7 January 2019 / Published: 10 January 2019
(This article belongs to the Special Issue Colorimetric and Fluorescent Sensors 2018)
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Abstract

Silver is a common catalyst in industrial production, and the frequent use of Ag+ can cause water pollution. Thus, the detection of Ag+ in the environment is necessary to determine the level of pollution from silver. In this work, we designed a new, highly selective near-infrared (NIR) fluorescent probe QCy to detect Ag+. The probe exhibits “turn-off” fluorescence quenching responses at 760 nm towards Ag+ over other relevant cations, with outstanding sensitivity and a low detection limit (0.03 µM), which is considerably lower than the standard of the World Health Organization (WHO) for drinking water (0.9 µM). Meanwhile, QCy showed a very good linearity at a low concentration of Ag+ with a ‘naked eye’ visible color change of solution from blue to red. The probe has been applied successfully for the detection of Ag+ in real water samples. View Full-Text
Keywords: fluorescence probe; Ag+; sensitivity; selectivity; water samples fluorescence probe; Ag+; sensitivity; selectivity; water samples
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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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Zhang, Y.; Ye, A.; Yao, Y.; Yao, C. A Sensitive Near-Infrared Fluorescent Probe for Detecting Heavy Metal Ag+ in Water Samples. Sensors 2019, 19, 247.

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