A novel Ce(Ⅳ)ion-selective polyvinyl chloride membrane electrode based on HDEHP and HEH/EHP  

作　　者：何金桂 李勇 薛向欣 茹红强 黄小卫 杨合 

机构地区：[1]Department of Resources and Environment,School of Metallurgy,Northeastern University,Shenyang 110819,China [2]Liaoning Key Laboratory of Recy-cling Science for Metallurgical Resources,Shenyang 110819,China [3]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [4]National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals,and Grirem Advanced Materials Co.,Ltd.,Beijing 100088,China

出　　处：《Journal of Rare Earths》2017年第9期934-940,共7页稀土学报（英文版）

基　　金：supported by the Key Program of National Natural Science Foundation of China(50934004);National Natural Science Foundation of China(51274061);Major State Basic Research Development Program of China(2012CBA01205);Fundamental Research Supporting Project of Northeastern University(N110602006)

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 SO_4^（2–）, 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 SO_4^（2–） 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 H_2O_2 solution, and could also be used for the determination of Ce（Ⅳ） in real Ce（Ⅳ）-containing aqueous samples.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 SO_4^（2–）, 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 SO_4^（2–） 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 H_2O_2 solution, and could also be used for the determination of Ce（Ⅳ） in real Ce（Ⅳ）-containing aqueous samples.

关 键 词：Ce（Ⅳ） ion-selective electrode HDEHP HEH/EHP PVC membrane potential response rare earths 

分 类 号：O657.15[理学—分析化学]