301. Fluorescent method for the determination of sulfide anion with ZnS:Mn quantum dots.
- Author
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Zhang BH, Wu FY, Wu YM, and Zhan XS
- Subjects
- Buffers, Hydrogen-Ion Concentration, Particle Size, Solubility, Spectrometry, Fluorescence, Spectroscopy, Fourier Transform Infrared, Thioglycolates chemistry, Water chemistry, X-Ray Diffraction, Manganese chemistry, Quantum Dots, Sulfides analysis, Sulfides chemistry, Zinc Compounds chemistry
- Abstract
Water-soluble Mn(2+)-doped ZnS quantum dots (QDs) were prepared using mercaptoacetic acid as the stabilizer. The optical properties and structure features were characterized by X-Ray, absorption spectrum, IR spectrum and fluorescence spectrum. In pH 7.8 Tris-HCl buffer, the QDs emitted strong fluorescence peaked at 590 nm with excitation wavelength at 300 nm. The presence of sulfide anion resulted in the quenching of fluorescence and the intensity decrease was proportional to the S(2-) concentration. The linear range was from 2.5 x 10(-6) to 3.8 x 10(-5) mol L(-1) with detection limit as 1.5 x 10(-7) mol L(-1). Most anions such as F(-), Cl(-), Br(-), I(-), CH(3)CO(2) (-), ClO(4) (-), CO(3) (2-), NO(2) (-), NO(3) (-), S(2)O(3) (2-), SO(3) (2-) and SO(4) (2-) did not interfere with the determination. Thus a highly selective assay was proposed and applied to the determination of S(2-) in discharged water with the recovery of ca. 103%.
- Published
- 2010
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