title: Selective spectrofluorimetric determination of sulfide ion using manganese doped ZnS quantum dots as luminescent probe.
abstract: This work reports a spectrofluorimetric method for selective and sensitive determination of sulfide ion in aqueous solution. The ultra-small zinc sulfide quantum dots (QDs) doped with manganese (ZnS:Mn) were synthesized by using a simple and fast procedure based on the co-precipitation of nanoparticles in aqueous solution in the presence of 2-mercaptoethanol, as capping agent. The nanoparticles have exhibited two strong fluorescent emissions at about 424 and 594 nm. Luminescent surface-capped ZnS:Mn QDs, with particle size below 5 nm, have been applied for determination of sulfide anions in water samples. Under the optimum conditions, the fluorescence intensity of ZnS:Mn QDs is linearly proportional to the sulfide ion concentration in the range 1.2×10(-6) to 2.6×10(-5) mol L(-1) with a detection limit as 3.3×10(-7) mol L(-1). The relative standard deviation for five replicate measurements (for 8.0×10(-6) mol L(-1) of S(2-)) was obtained to be 2.6%. It was founded that the interference of the other anions was negligible on the quantitive determination of sulfide ion.
authors: Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran. h.rajabi@mail.yu.ac.ir
authors: Hamid Reza
authors: HR
authors: Rajabi
authors: Mojtaba
authors: M
authors: Shamsipur
authors: Ali Azam
authors: AA
authors: Khosravi
authors: Omid
authors: O
authors: Khani
authors: Mohammad Hasan
authors: MH
authors: Yousefi
mesh_terms: D049408:Luminescent Agents / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D045663:Quantum Dots; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013440:Sulfides / Q000032:analysis* / Q000737:chemistry; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D049408:Luminescent Agents; D013440:Sulfides; D017967:Zinc Compounds; D008345:Manganese; C031238:zinc sulfide