期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
卷 100, 期 7, 页码 789-807出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/03067319.2019.1641202
关键词
Fluorescence resonance energy transfer; dyes; optical sensor; mercury
资金
- DST, Govt. of India [EMR/2014/000234]
- FIST DST project [SR/FST/PSI-191/2014]
- DST-WOS-A project - Govt. of India [SR/WOS-A/PM-78/2016]
- UGC, Govt. of India [UGC - SAP program 2016]
A mercury (II) sensor has been proposed based on Fluorescence Resonance Energy Transfer (FRET) between N,N'-dioctadecyl thiacyanine perchlorate (NK) and Octadecyl rhodamine B chloride (RhB). Out of these two molecules, NK is sensitive to Hg2+ ions due to the presence of sulphur atom in it. Accordingly, presence of Hg2+ ions affects the NK fluorescence as well as FRET from NK to RhB. Our results showed that NK fluorescence intensity and FRET efficiency linearly decrease with an increase in Hg2+ ion concentration. With proper optimisation, present system under investigations can be used to sense Hg2+ ions in aqueous solution with a detection limit of 9.13 ppb. Advantage of this present system is that it is very simple compared to the other FRET-based system and also it works under aqueous environment. This method has also been tested using real lake water, and satisfactory results were obtained.
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