Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Apr 15;107:256-62. doi: 10.1016/j.saa.2013.01.045. Epub 2013 Jan 31.
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.
本工作报道了一种在水溶液中选择性和灵敏测定硫化物离子的荧光光谱法。通过在水溶液中基于纳米粒子的共沉淀，在巯基乙醇存在下作为封端剂，合成了超小的掺锰硫化锌量子点（ZnS:Mn）。纳米粒子在约 424nm 和 594nm 处表现出两个强荧光发射峰。发光表面封端的 ZnS:Mn QD，粒径小于 5nm，已应用于水样中硫化物阴离子的测定。在最佳条件下，ZnS:Mn QD 的荧光强度与硫化物离子浓度在 1.2×10(-6)至 2.6×10(-5)mol L(-1)范围内呈线性关系，检出限为 3.3×10(-7)mol L(-1)。对于 8.0×10(-6)mol L(-1)的 S(2-)，五次重复测量的相对标准偏差为 2.6%。发现其他阴离子对硫化物离子的定量测定的干扰可以忽略不计。
