中文摘要：

以谷胱甘肽为稳定剂，在水相中合成了ZnSe量子点（QDs）。基于Ag＋对ZnSeQDs的荧光猝灭作用，建立了以QDs作为荧光探针测定微量Ag＋的新方法。结果表明：在优化条件下，Ag＋的浓度在7．85～157．01μg·L-1范围内和F0／F有良好的线性关系，相关系数r为0．9989，检测限为0．12μg·L-1。由Stern—Volmer方程获得了反应的猝灭常数和双分子猝灭速率常数，由双倒数方程获得了Ag＋与ZnSeQDs相互作用的结合常数、结合位点数，并判断出其作用机理为静态猝灭。根据热力学方程计算热力学参数，结果表明Ag＋与ZnSeQDs的相互作用为自发过程，主要为静电作用力。

英文摘要：

ZnSe quantum dots were synthesized with GSH as a stabilizer in aqueous solution. Based on the quenching effect of Ag＋ on the fluorescence of ZnSe QDs,a method for determination of trace silver was developed. The results showed that under the optimized conditions, there was a good linear relationship between Fo/F and Ag＋ concentration in range of 7.85-157.01 μg-L-1, with correlation coefficient of 0. 9989 and detection limit of 0.12 μg·L-1. Quenching constant and bimolecular quenching rate constant were obtained according to Stern Volmer equation, the binding constant and binding site number of interaction were also calculated according to Lineweaver-Burk equation. It is demonstrated that the quenching mechanism is static quenching. According to thermodynamic equation, the thermodynamic parameters were calculated. The results indicated that the interaction between ZnSe QDs and Ag＋ was spontaneous and induced mainly by electrostatic force.