Selective fluorescent Hg(II) detection in aqueous solutions with a dye intermediate.
A dye intermediate, 1-amino-8-naphthol-3,6-disulfonic acid sodium (ANDS) was first used to selectively recognize Hg(II) in aqueous solutions with its fluorescence being strong quenched. The fluorescence quenching of ANDS was attributed to the formation of an inclusion complex between Hg(II) and ANDS by 2:1 complex ratio (K=6.2 x 10(9)), which has been utilized as the basis of the fabrication of the Hg(II)-sensitive fluorescent chemosensor. The analytical performance characteristics of the proposed chemosensor were investigated. The sensor shows a linear response toward Hg(II) in the concentration range 2.9 x 10(-6) to 5.5 x 10(-5)M with a limit of detection of 5.3 x 10(-7)M, and a working pH range from 5.0 to 9.0. It shows excellent selectivity for Hg(II) over a large number of cations such as alkali, alkaline earth and transitional metal ions. The proposed method was utilized successfully for the detection of Hg(2+) in water samples.
Young
Song
S
School of Pharmaceutical Sciences, Hunan University of Chinese Medicine, Changsha, PR China. songyanghn@hotmail.com
D002681:China; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008628:Mercury / Q000032:analysis*; D009282:Naphthalenesulfonates / Q000737:chemistry; D045483:Rivers / Q000737:chemistry; D012996:Solutions; D013050:Spectrometry, Fluorescence
D004396:Coloring Agents; D009282:Naphthalenesulfonates; D012996:Solutions; D008628:Mercury