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首页> 外文期刊>International Journal of Electrochemistry >Potentiometric Response Characteristics of Membrane-BasedCs+-Selective Electrodes Containing Ionophore-Functionalized Polymeric Microspheres
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Potentiometric Response Characteristics of Membrane-BasedCs+-Selective Electrodes Containing Ionophore-Functionalized Polymeric Microspheres

机译：含离子载体功能化聚合物微球的基于膜的Cs +选择电极的电位响应特性

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Cs+-selective solvent polymeric membrane-based ion-selective electrodes (ISEs) were developed by doping ethylene glycol-functionalized cross-linked polystyrene microspheres (P-EG) into a plasticized poly(vinyl chloride) (PVC) matrix containing sodium tetrakis-(3,5-bis(trifluoromethyl)phenyl) borate (TFPB) as the ion exchanger. A systematic study examining the effects of the membrane plasticizers bis(2-ethylhexyl) sebacate (DOS), 2-nitrophenyl octyl ether (NPOE), and 2-fluorophenyl nitrophenyl ether (FPNPE) on the potentiometric response and selectivity of the corresponding electrodes was performed. Under certain conditions, P-EG-based ion-selective electrodes (ISEs) containing TFPB and plasticized with NPOE exhibited a super-Nernstian response between1×10−3and1×10−4 M Cs+, a response characteristic not observed in analogous membranes plasticized with either DOS or FPNPE. Additionally, the performance of P-EG-based ISEs was compared to electrodes based on two mobile ionophores, a neutral lipophilic ethylene glycol derivative (ethylene glycol monooctadecyl ether (U-EG)) and a charged metallacarborane ionophore, sodium bis(dicarbollyl)cobaltate(III) (CC). In general, P-EG-based electrodes plasticized with FPNPE yielded the best performance, with a linear range from 10-1–10-5 M Cs+, a conventional lower detection limit of8.1×10−6 M Cs+, and a response slope of 57.7 mV/decade. The pH response of P-EG ISEs containing TFPB was evaluated for membranes plasticized with either NPOE or FPNPE. In both cases, the electrodes remained stable throughout the pH range 3–12, with only slight proton interference observed below pH 3.
机译：通过将乙二醇官能化的交联聚苯乙烯微球（P-EG）掺杂到含有四氯化钠的增塑聚氯乙烯（PVC）基质中，开发出基于Cs +选择性溶剂聚合物膜的离子选择电极（ISE）。 3,5-双（三氟甲基）苯基）硼酸酯（TFPB）作为离子交换剂。系统研究了膜增塑剂癸二酸双（2-乙基己基）酯（DOS），2-硝基苯基辛基醚（NPOE）和2-氟苯基硝基苯基醚（FPNPE）对相应电极的电位响应和选择性的影响执行。在某些条件下，含有TFPB并经NPOE增塑的基于P-EG的离子选择电极（ISE）表现出在1×10-3和1×10-4 M Cs +之间的超能斯特响应，该响应特性在用NPOE增塑的类似膜中未观察到DOS或FPNPE。此外，将基于P-EG的ISE的性能与基于两个可移动离子载体，中性亲脂性乙二醇衍生物（乙二醇单十八烷基醚（U-EG））和带电荷的金属碳硼烷离子载体，双（二甲碳酸钠）钴酸钠的电极进行了比较。 （III）（CC）。通常，用FPNPE塑化的P-EG基电极表现出最佳性能，线性范围为10-1–10-5 M Cs +，常规检测下限为8.1×10-6 M Cs +，并且响应速度快。斜率为57.7 mV /十倍。对于用NPOE或FPNPE增塑的膜，评估了含TFPB的P-EG ISE的pH响应。在这两种情况下，电极在3至12的pH范围内均保持稳定，在pH 3以下仅观察到轻微的质子干扰。

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