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通过水相法制备3-巯基丙酸(MPA)稳定的碲化镉量子点(CdTe QDs),即MPA-CdTe QDs.研究Cu2+对发射波长为599 nm的MPA-CdTe QDs荧光猝灭效应,发现Cu2浓度与荧光猝灭强度之间满足Stern-Volmer修正方程的线性关系.通过多项式拟合得出Cu2+浓度在2.28×10-6 ～ 18.24×10-6 mol/L和4.8×10-7～12×10-7mol/L两个区间范围内与MPA-CdTe QDs的荧光强度Fo/F的多项式关系分别为:Fo/F=7.999-2.470c+0.339c2,Fo/F=3.154-0.160c +0.049 c2,拟合度分别为0.991,0.993.MPA-CdTe QDs对CH2检测限可达1.326×10-7 mol/L.“,”The water-soluble 3-mercaptopropionic acid (MPA)-stabilized CdTe (MPA-CdTe) quantum dots (QDs) were synthesized by aqueous suspension.The study showed that the fluorescence quenching process of Cu2+ to MPA-CdTe QDs,whose largest emission peak was 599 nm,could be described well by the theory of fluorescence quenching in competitive absorption systems and its modification of Stern-Volmer equations.By fittings,the results showed a good polynomial relationship between the fluorescence intensity F0/F and the concentration of Cu2+,when the concentration was in the range of 2.28 × 10-6-18.24 × 10-6 mol/L and 4.8 × 10-7-12 × 10-7 mol/L,and two polynomial equations were respectively elucidated based on dynamic and static quenching in competitive-absorption systems:F0/F =7.999-2.470c +0.339 c2,F0/F =3.154-0.160 c +0.049 c2 and degree of fitting are 0.991 and 0.993,respectively.The detection limit was 1.326 × 10-7.