A novel Ce（Ⅳ） ion-selective polyvinyl chloride membrane electrode based on HDEHP and HEH/EHP
来源期刊：JOURNAL OF RARE EARTHS2017年第9期
论文作者：何金桂 李勇 薛向欣 茹红强 黄小卫 杨合
文章页码：934 - 940
摘 要：A novel Ce（Ⅳ） ion-selective polyvinyl chloride（PVC） membrane electrode based on HDEHP and HEH/EHP as ionophore was successfully prepared. The factors affecting the response of Ce（Ⅳ） ion were investigated, such as membrane composition, internal solution, concentration of SO42–, and acidity in test solution. The best performance was obtained using the membrane with PVC:DBP:HDEHP:HEH/EHP:OA mass ratio of 75:175:5:5:5. The proposed electrode exhibited a Nernstian slope of 30.44 mV/decade for Ce（Ⅳ） ion over a linear concentration range of 1×10–5–1×10–1 mol/L with the detection limit of 9.0×10-6 mol/L. The electrode showed stable response within the SO42– concentration range of 0.1–1 mol/L and the acidity range of 0.25–1.2 mol/L H+. The proposed electrode showed high selectivity for Ce（Ⅳ） over a wide variety of interfering ions and a fast response time. It was used as an indicator in the potentiometric titration of Ce（Ⅳ） solution with H2O2 solution, and could also be used for the determination of Ce（Ⅳ） in real Ce（Ⅳ）-containing aqueous samples.
何金桂1,2,3，李勇1,2，薛向欣1,2，茹红强3，黄小卫4，杨合1,2
1. Department of Resources and Environment School of Metallurgy Northeastern University2. Liaoning Key Laboratory of Recy- cling Science for Metallurgical Resources3. School of Materials Science and Engineering Northeastern University4. National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals and Grirem Advanced Materials Co. Ltd.
摘 要：A novel Ce（Ⅳ） ion-selective polyvinyl chloride（PVC） membrane electrode based on HDEHP and HEH/EHP as ionophore was successfully prepared. The factors affecting the response of Ce（Ⅳ） ion were investigated, such as membrane composition, internal solution, concentration of SO42–, and acidity in test solution. The best performance was obtained using the membrane with PVC:DBP:HDEHP:HEH/EHP:OA mass ratio of 75:175:5:5:5. The proposed electrode exhibited a Nernstian slope of 30.44 mV/decade for Ce（Ⅳ） ion over a linear concentration range of 1×10–5–1×10–1 mol/L with the detection limit of 9.0×10-6 mol/L. The electrode showed stable response within the SO42– concentration range of 0.1–1 mol/L and the acidity range of 0.25–1.2 mol/L H+. The proposed electrode showed high selectivity for Ce（Ⅳ） over a wide variety of interfering ions and a fast response time. It was used as an indicator in the potentiometric titration of Ce（Ⅳ） solution with H2O2 solution, and could also be used for the determination of Ce（Ⅳ） in real Ce（Ⅳ）-containing aqueous samples.
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