CdTe-Cys-QDs在聚酰胺素膜(PAM)上能发射强而稳定的室温磷光(RTP),并可被H_2O_2氧化为CdTe-CysQDs,结果使CdTe-Cys-QDs的表面新的缺陷增多,导致其磷光信号猝灭;更有趣的是As(Ⅴ)催化H_2O_2氧化CdTeCys-QDs导致体系的RTP剧烈猝灭,显示催化反应对RTP信号有放大效应.据此,提出一种测定痕量As(Ⅴ)的新CdTe-Cys-QDs磷光传感器.这种简便、快捷、灵敏(检出限(LD)=2.1×10~(-18)gmL~(-1))的磷光传感器用于人发和茶叶中痕量砷的测定结果与与AAS法相吻合. CdTe-Cys-QDs can emit strong and stable room-temperature phosphorescence (RTP) on polyamide (PAM) film and be oxidized by H 2 O 2 to CdTe-Cys QDs. As a result, CdTe-Cys- More interesting is that As (Ⅴ) catalysing the H_2O_2 oxidation of CdTeCys-QDs leads to the quenching of the RTP of the system, indicating that the catalytic reaction has an amplification effect on the RTP signal.Accordingly, a new method for the determination of trace As (Ⅴ) Ⅴ), a new type of CdTe-Cys-QDs phosphorescence sensor, which is simple, rapid and sensitive (detection limit (LD) = 2.1 × 10 ~ (-18) gmL -1) The determination of trace amounts of arsenic in tea is consistent with the AAS method.