Wang Lun, Liang A-Ni, Chen Hong-Qi, Liu Yan, Qian Bin-bin, Fu Jie
Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China.
Anal Chim Acta. 2008 Jun 2;616(2):170-6. doi: 10.1016/j.aca.2008.04.027. Epub 2008 Apr 18.
Based on the characteristics of synchronous fluorescence spectroscopy (SFS), a new method with high sensitivity and selectivity was developed for rapid determination of silver ion with functional cadmium sulphide (CdS) nanoparticles as a fluorescence probe. When Delta lambda (lambda(em) - lambda(ex)) = 215 nm, maximum synchronous fluorescence is produced at 304 nm. Under optimal conditions, functional cadmium sulphide displayed a calibration response for silver ion over a wide concentration range from 0.8x10(-10) to 1.5x10(-8) mol L(-1). The limit of detection was 0.4x10(-10) mol L(-1) and the relative standard deviation of seven replicate measurements for the lowest concentration (0.8x10(-10) mol L(-1)) was 2.8%. Compared with several fluorescence methods, the proposed method had a wider linear range and improved the sensitivity. Furthermore, the concentration dependence of the synchronous fluorescence intensity is effectively described by a Langmuir-type binding isotherm.
基于同步荧光光谱法（SFS）的特点，以功能化硫化镉（CdS）纳米粒子作为荧光探针，开发了一种用于快速测定银离子的高灵敏度和高选择性新方法。当Δλ（λem - λex）= 215 nm时，在304 nm处产生最大同步荧光。在最佳条件下，功能化硫化镉在0.8×10⁻¹⁰至1.5×10⁻⁸ mol L⁻¹的宽浓度范围内对银离子呈现校准响应。检测限为0.4×10⁻¹⁰ mol L⁻¹，最低浓度（0.8×10⁻¹⁰ mol L⁻¹）的七次重复测量的相对标准偏差为2.8%。与几种荧光方法相比，该方法具有更宽的线性范围并提高了灵敏度。此外，同步荧光强度的浓度依赖性可以通过Langmuir型结合等温线有效地描述。
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