Department of Sensor and Display Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea.
J Fluoresc. 2011 Mar;21(2):747-51. doi: 10.1007/s10895-010-0765-3. Epub 2010 Nov 4.
An optode system based on a plasticized polymer membrane containing cesium ion-selective fluoroionophore and lipophilic anions for the determination of cesium ions has been developed. In this work, 15-crown-5 derivative including anthracene was used as a fluoroionophore. Emission intensity of the optode membrane incorporating 15-crown-5-anthracene was measured at 500 nm with excitation at 360 nm in the presence of Tris-HCl buffer solution. Under optimum experimental condition, the relative fluorescence intensity was linear with the concentration of cesium ion in the range of 1.0 × 10(-4) M to 1.0 × 10(-1) M and the detection limit was obtained 4.2 × 10(-5) M, as defined by LOD=3 × S(b)/m (where S(b)=standard deviation of blank signal and, m=slope of the calibration curve). The effect of pH of sample solution on the fluorescent response, the selectivity, response time and reproducibility of the optode membrane were also discussed. The fluorescent optode system shows a high selectivity and sensitivity for cesium ion with respect to other cations such as K(+), Na(+) and Li(+).
已经开发出一种基于含有铯离子选择性荧光离子体和亲脂性阴离子的塑料化聚合物膜的光学位系统，用于测定铯离子。在这项工作中，使用了包含蒽的 15-冠-5 衍生物作为荧光离子体。在 Tris-HCl 缓冲溶液存在下，用 360nm 的激发光在 500nm 处测量掺入 15-冠-5-蒽的光学位膜的发射强度。在最佳实验条件下，相对荧光强度与铯离子的浓度在 1.0×10(-4) M 至 1.0×10(-1) M 范围内呈线性关系，检测限为 4.2×10(-5) M，定义为 LOD=3×S(b)/m（其中 S(b)=空白信号的标准偏差，m=校准曲线的斜率）。还讨论了样品溶液 pH 值对光学位膜的荧光响应、选择性、响应时间和重现性的影响。与其他阳离子如 K(+)、Na(+)和 Li(+)相比，荧光光学位系统对铯离子具有高选择性和灵敏度。
