Fluorescent method for the determination of sulfide anion with ZnS:Mn quantum dots.
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%.
Department of Chemistry and Center of Analysis and Testing, Nanchang University, Nanchang, 330031, China.
Bao-Hua
BH
Zhang
Fang-Ying
FY
Wu
Yu-Mei
YM
Wu
Xun-Shou
XS
Zhan
D002021:Buffers; D006863:Hydrogen-Ion Concentration; D008345:Manganese / Q000737:chemistry*; D010316:Particle Size; D045663:Quantum Dots; D012995:Solubility; D013050:Spectrometry, Fluorescence; D017550:Spectroscopy, Fourier Transform Infrared; D013440:Sulfides / Q000032:analysis* / Q000737:chemistry*; D013864:Thioglycolates / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction; D017967:Zinc Compounds / Q000737:chemistry*
D002021:Buffers; D013440:Sulfides; D013864:Thioglycolates; D017967:Zinc Compounds; D014867:Water; D008345:Manganese; C017487:2-mercaptoacetate; C031238:zinc sulfide