采用水热合成方法制备出水溶性巯基乙胺（CA）稳定的CdTe(CA-CdTe)量子点，并研究了该量子点对不同金属离子的荧光响应情况。基于Cu2+对该量子点具有选择性荧光猝灭，选择粒径大小分别为3.27 nm和3.60 nm的CA-CdTe量子点对Cu2+进行荧光响应分析，实现对Cu2+的定量分析与荧光检测。研究结果表明，Cu2+对CA-CdTe量子点的荧光猝灭过程可以很好地用Stern-Volmer荧光猝灭方程来描述，当Cu2+浓度分别在4×10-6～44×10-6 mol·L-1和1.6×10-6～40×10-6 mol·L-1范围内时，两种粒径大小的CA-CdTe量子点的荧光强度F0/F与Cu2+浓度之间具有较好的线性关系，线性相关系数分别为0.9876和0.9964，检测限分别为8.30×10-7 mol·L-1和5.08×10-7 mol·L-1，并且CA-CdTe量子点粒径大小的不同不会影响其对金属Cu2+的检测分析。该量子点荧光分析方法简便快速、灵敏度高、选择性好，能够应用于实际水样中Cu2+的分析与检测。

Water-soluble mercaptoethylamine (CA) stabilized CdTe (CA-CdTe) quantum dots (QDs) are synthetized by hydrothermal synthesis method, and the fluorescent responses of as-prepared CA-CdTe QDs to different metal ions are studied. Based on the selective fluorescence quenching of Cu2+ to CA-CdTe QDs, the fluorescent responses of CA-CdTe QDs with particle sizes of 3.27 nm and 3.60 nm to Cu2+ are studied. The study results show that the fluorescence quenching process of Cu2+ to CA-CdTe QDs can be described well by Stern-Volmer fluorescence quenching equation. There is a good linear relationship between the fluorescence intensity F0/F and the concentration of Cu2+ when the concentration of Cu2+ is in the ranges of 4×10-6～44×10-6 mol·L-1 and 1.6×10-6～40×10-6 mol·L-1. The linear correlation coefficients are 0.9876 and 0.9964 respectively, and the detection limits are 8.30×10-7 mol·L-1 and 5.08×10-7 mol·L-1 respectively. The study results also show that the difference of particle sizes of CA-CdTe QDs could not affect the detection and analysis of Cu2+. The fluorescence method of detecting Cu2+ based on CA-CdTe QDs is simple, rapid and sensitive, which can be used well for analysis and detection of Cu2+ in actual water samples.