Rhodamine-based ratiometric fluorescence sensing for the detection of mercury(II) in aqueous solution.
Novel ratiometric fluorescent silica nanoparticles with high selectivity towards Hg(2+) were synthesized for the detection of Hg(2+). Hg(2+) 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 Hg(2+) concentration, and the detection limit (S/N=3) for Hg(2+) 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 Hg(2+) in water samples.
Liu
Haizhu
H
Key Laboratory of Analysis and Detection Technology for Food Safety, Ministry of Education, Department of Chemistry, Fuzhou University, Fuzhou 350002, China.
Yu
Ping
P
Du
Dan
D
He
Chunyan
C
Qiu
Bin
B
Chen
Xi
X
Chen
Guonan
G
D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D005456:Fluorescent Dyes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008628:Mercury / Q000032:analysis*; D053758:Nanoparticles / Q000737:chemistry; D015203:Reproducibility of Results; D012235:Rhodamines / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
D005456:Fluorescent Dyes; D012235:Rhodamines; D012996:Solutions; C026188:rhodamine 6G; D014867:Water; D012822:Silicon Dioxide; D008628:Mercury