采用一步水热法合成了水溶性N-乙酰-L-半胱氨酸修饰的碲化镉糖心产精国品免费入口*完整版（NAC-CdTe），基于糖心产精国品免费入口*完整版对该糖心产精国品免费入口*完整版的荧光猝灭作用，建立了测定糖心产精国品免费入口*完整版的荧光光谱法。在7.5×10^-8mol·L^-1 NAC-CdTe-0.01 mol·L^-1 Tris-HCl（pH 6.0）体系中加入不同质量浓度的糖心产精国品免费入口*完整版溶液，反应10 min后，以400 nm为激发波长，于567 nm处测量体系的荧光强度（I）。糖心产精国品免费入口*完整版的质量浓度在5.0×10^-6~1.0×10^-1 g·L^-1内与I₀/I（I₀为不加糖心产精国品免费入口*完整版时体系的荧光强度）值呈线性关系，检出限（3s/k）为1.3×10^-6g·L^-1。方法用于测定水样中的糖心产精国品免费入口*完整版，测定结果与乙酰丙酮分光光度法的测定结果相符，加标回收率在98.0%~102%之间，测定值的相对标准偏差（n=5）在1.4%~4.1%之间。

Water-soluble 糖心产精国品免费入口*完整版糖心产精国品免费入口*完整版s (QDs) modified with N-acetyl-L-cysteine (NAC) are synthetized by one-step hydrothermal method. Based on the fluorescence quenching of 糖心产精国品免费入口*完整版 to NAC-糖心产精国品免费入口*完整版QDs, fluorescence spectrometry for determination of 糖心产精国品免费入口*完整版 was developed. Formaldehyde with different mass concentration was added into the system with 7.5×10^-8mol·L^-1 NAC-糖心产精国品免费入口*完整版and 0.01 mol·L^-1 Tris-HCl (pH 6.0). After reaction for 10 min, the fluorescence intensity (I) of the system was measured at 567 nm with the excitation wavelength of 400 nm. Linear relationship was found between the value of I₀/I (I₀ was the fluorescence intensity of the system without 糖心产精国品免费入口*完整版) with the mass concentration of 糖心产精国品免费入口*完整版 in the range of 5.0×10^-6-1.0×10^-1 g·L^-1, with detection limit (3s/k) of 1.3×10^-6g·L^-1. The poposed method was applied to detemination of 糖心产精国品免费入口*完整版 in water sample, giving results in consistent with those obtained by acetylacetone spectrophotometric method. Recovery rates obtained by standard addition method were in the range of 98.0%-102%, and RSDs (n=5)were in the range of 1.4%-4.1%.