A Multimode Optical Sensor for Selective and Sensitive Detection of Harmful Heavy Metal Cr(VI) in Fresh Water and Sea Water

Water pollution originating from heavy metals has shown great impacts on the ecological environment and human health due to their extremely low biodegradability. Hexavalent chromium Cr­(VI), as one harmful heavy metal with strong oxidation, high biological permeability, and high carcinogenicity, is...

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Published inAnalytical chemistry (Washington) Vol. 96; no. 21; pp. 8705 - 8712
Main Authors Ma, Yu, Li, Mengnan, Qi, Xin, Cao, Yanyu, Zhang, Wanting, Gao, Guorui, Tang, Bo
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 28.05.2024
Subjects
Biodegradability
Biodegradation
Carcinogenicity
Carcinogens
Chemical analysis
Chromium
Colorimetry
Detection limits
Fresh water
Heavy metals
Hexavalent chromium
Metal-organic frameworks
Optical measuring instruments
Oxidation
Permeability
Seawater
Sensors
Water analysis
Water pollution
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Summary:Water pollution originating from heavy metals has shown great impacts on the ecological environment and human health due to their extremely low biodegradability. Hexavalent chromium Cr­(VI), as one harmful heavy metal with strong oxidation, high biological permeability, and high carcinogenicity, is becoming an increasingly serious threat to human health. Therefore, conveniently but accurately, monitoring the Cr­(VI) level in water to maintain its normal level and ensuring the stability of the ecosystem and human health become very valuable. However, most of these heavy metal sensors reported are turn-off type single-emission sensors. In this work, a ratiometric fluorescence/colorimetry/smartphone triple-mode turn-on optical sensor for Cr­(VI) was developed based on a multifunctional metal–organic framework platform. The detection limits for these three mutual verification modes were only 1.28, 4.89, and 68.4 nM, respectively. Additionally, the color changes of the detection system under sunlight can also be observed directly by the naked eye. The accuracy and practicability of this multimode sensor were further proved by the detection of Cr­(VI) in actual water and seawater samples, and the recovery rate ranged from 97.308 to 104.041%.
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ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.4c00947