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

• Published in: 中国稀土学报：英文版 2017, Vol.35 (9), p.934-940
• Main Author: 何金桂 李勇 薛向欣 茹红强 黄小卫 杨合
• Format: Article
• Language: English
• Subjects: Ce（Ⅳ）; HDEHP; 毛细管电泳; 浓度范围; 离子载体; 离子选择性; 聚氯乙烯; 选择性膜电极
• ISSN: 1002-0721; 2509-4963

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.