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中文摘要：
本研究在水相中合成了高质量的巯基乙酸包被的CdTe量子点。在pH5.8～8.0范围内的PBS缓冲溶液中,CdTe量子点荧光强度与体系酸度存在良好的线性关系。利用NH4＋对量子点荧光的猝灭作用,实现了对水溶液中NH4＋的定量检测。在最优条件下,CdTe量子点酸度敏感探针荧光的猝灭程度与NH4＋浓度呈良好的线性关系,线性范围为0.05～6.0mmol/L,检出限为0.15μmol/L。对1.0mmol/L标准溶液平行测定11次,相对标准偏差为3.2%。利用标准加入法对水样中NH4＋含量进行了测定,其结果与蒸馏-酸滴定法的结果基本一致。
英文摘要：
Thioglycolic acid-capped CdTe quantum dots （QDs） were prepared by hydrothermal method and used to the determination of ammoniaeal nitrogen. It was found that the fluorescence intensity of CdTe QDs in PBS was pH sensitive and went through a well linear change in the range of 5.8 - 8.0. A new method for the determination of NH4^＋ was developed based on the fluorescence quenching of CdTe QDs caused by pH value changes due to the presence of NH/ in aqueous medium. Under the optimized conditions, the fluorescence quenching of CdTe QDs was proportional to the concentration of NH4^＋ in the range of 5.0 × 10^-5 - 6.0 × 10^-3 mol/L with a conelation coefficient of 0. 9997. A detection limit of 1. 5 × 10^-5 mol/L （3σ） was obtained with the RSD of 3.2% （ 1.0 mmol/L, n = 11 ）. The method was applied to the determination of NH4 in water samples via standard addition method, the results were in a good agreement with those obtained by the standard distillation-titration method.
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