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利用CdTe量子点(QDs)和乙二胺四乙酸(EDTA)构建的纳米探针,建立了一种能快速灵敏检测Cd2+的新方法。利用EDTA溶液与Cd2+的络合作用对QDs的表面进行化学蚀刻,在QDs表面形成了Cd2+的空腔,这些表面缺陷使得QDs荧光猝灭,而继续加入Cd2+后,新加入的Cd2+能够迅速补位空腔修复表面缺陷,使得QDs的荧光恢复。在最佳的实验条件下,当Cd2+浓度在3.3×10-9~6.7×10-6mol/L范围时,QDs恢复的荧光强度与Cd2+浓度之间呈良好的线性关系,检出限为1.0×10-9mol/L(S/N=3)。此外,相对于其他金属离子,该荧光探针对Cd2+具有高选择性,并且将其用于实际水样中Cd2+含量的检测,结果令人满意。
A new method for rapid and sensitive detection of Cd2 + was established by using CdTe quantum dots (QDs) and ethylenediaminetetraacetic acid (EDTA). The surface of QDs was chemically etched by the complexation of EDTA solution with Cd2 + to form a cavity of Cd2 + on the surface of QDs. These surface defects quenched the fluorescence of QDs. When Cd2 + was added, the newly added Cd2 + Cavity repairs surface defects, allowing fluorescence recovery of QDs. Under the optimal experimental conditions, there was a good linear relationship between the fluorescence intensity of QDs and the concentration of Cd2 + when the Cd2 + concentration was in the range of 3.3 × 10-9 ~ 6.7 × 10-6mol / L with the detection limit of 1.0 × 10-9 mol / L (S / N = 3). In addition, compared to other metal ions, the fluorescent probe has high selectivity for Cd2 + and is used for the detection of Cd2 + in actual water samples with satisfactory results.