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A selective fluorescent sensor for Hg2+ based on covalently immobilized naphthalimide derivative.
- Source :
-
Sensors & Actuators B: Chemical . Jul2013, Vol. 183, p565-573. 9p. - Publication Year :
- 2013
-
Abstract
- In this work, a selective fluorescent sensor for Hg2+ detection in aqueous solution, which contains a naphthalimide derivative covalently grafted to the glass surface, was developed. To fabricate the sensor, the naphthalimide derivative (compound 1) with a terminal double bond was prepared and photo-copolymerized with 2-hydroxyethyl methacrylate (HEMA) on the glass surface treated with a silanizing agent. Upon binding mercuric ions in 0.05mol/L Tris/HCl (pH 7.01) at 25°C, the resulting optical sensor undergoes fluorescence enhancement. Thus, the proposed sensor with visible excitation can behave as a fluorescent sensor for the selective detection of Hg2+. The fluorescence enhancement was induced by a photo-induced electron transfer (PET) inhibition process. In addition, the proposed sensor showed satisfactory selectivity, reproducibility and response time. The sensing membrane possesses a relatively long lifetime of at least 2 months. The chemosensor can be applied to the quantification of Hg2+ with a linear range covering from 6.0×10–6 to 2.0×10−4 M and a detection limit of 2.0×10−6 M. The determination of Hg2+ in river water samples shows satisfactory results. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09254005
- Volume :
- 183
- Database :
- Academic Search Index
- Journal :
- Sensors & Actuators B: Chemical
- Publication Type :
- Academic Journal
- Accession number :
- 89271625
- Full Text :
- https://doi.org/10.1016/j.snb.2013.04.024