Rhodamine-based ratiometric fluorescence sensing for the detection of mercury(II) in aqueous solution
Date
2010-04Author
Liu, Haizhu(Fuzhou Univ, Dept Chem, Key Lab Anal & Detect Technol Food Safety, Minist Educ, Fuzhou 350002, Peoples R China)
Yu, Ping(Fuzhou Univ, Dept Chem, Key Lab Anal & Detect Technol Food Safety, Minist Educ, Fuzhou 350002, Peoples R China)
Du, Dan(Cent China Normal Univ, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China)
He, Chunyan(Fuzhou Univ, Dept Chem, Key Lab Anal & Detect Technol Food Safety, Minist Educ, Fuzhou 350002, Peoples R China)
Qiu, Bin(Fuzhou Univ, Dept Chem, Key Lab Anal & Detect Technol Food Safety, Minist Educ, Fuzhou 350002, Peoples R China)
Chen, Xi
Chen, Guonan(Fuzhou Univ, Dept Chem, Key Lab Anal & Detect Technol Food Safety, Minist Educ, Fuzhou 350002, Peoples R China)
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Abstract
Novel ratiometric fluorescent silica nanoparticles with high selectivity towards Hg2+ were synthesized for the detection of Hg2+, Hg2+ promoted the ring opening of spirolactam in the rhodamine moiety grafted onto the silica nanoparticles, resulting in a change in the fluorescence intensity. The fluorescence intensity was proportional to the Hg2+ concentration, and the detection limit (S/N = 3) for Hg2+ was found to be 2.59 x 10(-9) mol L-1 with a linear range from 0.4 to 8 x 10(-7) mol L-1. In addition, the morphology of the silica nanoparticles, the effects of pH and co-existing substances, and the reversibility were investigated. The proposed approach was successfully applied to the determination of Hg2+ in water samples. (C) 2010 Elsevier B.V. All rights reserved.
Citation
TALANTA,2010,81(1-2):433-437Related items
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