新型稀土电极—水膜及PVC膜钐离子电极的制备

A New Type of Rare Earth Element Electrode——Water Membrane and PVC Membrane Samarium Electrode

本文研究了新型稀土电极——水膜及PVC膜钐离子电极的制备。水膜钐电极对低介电常数有机溶剂—磷酸三丁酯中的三价钐离子具有能斯特响应,响应曲线斜率为19mV/pCs_m^(3+),线性范围是1.0×10^(-4)—1.0×10^(-2)mol·dm^(-3),支持电解质和液接电势不影响响应曲线的斜率。根据离子在两互不相溶液液界面上迁移是双向可逆的原则,利用水膜钐电极的一些研究结果,制备了PVC膜钐电极,在高浓度硝酸中对钐离子响应,响应曲线线性范围为1.0×10^(-7)—1.0×10^(-5)mol·dm^(-3),响应斜率20mV/pCs_m^(3+)符合三价离子能斯特响应的斜率值。

The preparation of samarium electrode based on the water membrane or PVC membrane is reported. The water membrane samarium electrode to Sm3+ shows a Nernstian response in organic solvent with low dielectric constant as tributyl phosphate. The slope of response is 19 mV/ pC Sm3+ in the range of 1.0×10-4 to 1.0×10-2. Refer to the reversible transfer of ions in both direction of immiscible liquid/liquid interface, the PVC membrane-based samarium electrode was prepared with satisfactory data in terms of the similar preparing principles of water membrane based samarium electrode.