Abstract A cesium potentiometric microsensor based on magnetic ion-imprinted polymer (MIIP) has been developed for Cs(I) sensing. The core-shell structure Cs(I)-MIIP was synthesized by surface-imprinting technique, using functionalized magnetic Fe3O4@SiO2 microspheres, Cs(I) ion and carboxymethyl chitosan as supporter, template and functional monomers respectively. The resultant Cs(I)-MIIP was used as ionophore in the construction of the PVC membrane electrode to obtain a selective potentiometric microsensor toward Cs(I) ions. The fabricated sensor exhibited a highly sensitive Nernstian response (60.2 mV/decade) over the concentration range of 1 × 10−6 to 1 × 10−1 M of Cs(I). The response time of the microsensor was considerably short (less than 3 s) and its detection limit was determined as 3.0 × 10−7 M. The microsensor was effectively performed in the pH range of 4–6, and revealed desirable selectivity over a wide variety of other cations including alkali, alkaline earth and heavy metals. The proposed microsensor was also used for the determination of Cs(I) contents in the environmental water samples. The potentiometric results were in good harmony with the results obtained by the ICP-MS method. Graphical Abstract

中文翻译：

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基于离子印迹聚合物的电位微传感器，用于痕量铯 (I) 离子的测定

摘要 基于磁性离子印迹聚合物 (MIIP) 的铯电位微传感器已被开发用于 Cs(I) 传感。使用功能化磁性Fe3O4@SiO2微球、Cs(I)离子和羧甲基壳聚糖分别作为载体、模板和功能单体，通过表面压印技术合成了核壳结构的Cs(I)-MIIP。所得的 Cs(I)-MIIP 用作构建 PVC 膜电极的离子载体，以获得针对 Cs(I) 离子的选择性电位微传感器。制造的传感器在 Cs(I) 的 1 × 10−6 到 1 × 10−1 M 的浓度范围内表现出高度敏感的能斯泰响应 (60.2 mV/decade)。微传感器的响应时间相当短（小于 3 秒），其检测限确定为 3.0 × 10-7 M。该微传感器在 4-6 的 pH 范围内有效运行，并显示出对多种其他阳离子（包括碱金属、碱土金属和重金属）的理想选择性。所提出的微传感器还用于测定环境水样中的 Cs(I) 含量。电位结果与 ICP-MS 方法获得的结果非常一致。图形概要