2-水杨酰亚肼基-l,3-二硫杂环戊烷为载体的镧离子选择性电极的研究

Study on a new La^(3+) selective electrode based a Schiff base of 2-Salicy Hydrazono-1,3-Dithiolane as carrier

以2-水杨酰亚肼基-l,3-二硫杂环戊烷载体制备了PVC膜La3+离子选择性电极。该电极对La3+呈现出良好的选择性和近能斯特Nernst电位响应性能,其斜率为19.5±0.4mV/decade,线性范围为1.0×10-1～3.2×10-5mol/L,检测下限为1.6×10-5mol/L。采用交流阻抗技术研究了电极响应机理,并将该电极作为指示电极初步应用于电位滴定。

A PVC membrane electrode for La3＋ ion based on a Schiff base of 2-Salicy Hydrazono-1,3-Dithiolane as carrier was investigated.The prepared electrode displays a good selectivity toward La3＋ and exhibits a near Nernst response for La3＋,over a linear range of 1.0 ×10-1～3.2 ×10-5 mol/L with a detection limit of 1.6 ×10-5 mol/L and a slope of 19.5 ±0.4 mV/decade.The response mechanism was discussed in view of the alternating current（ac） impedance technique.The electrode was used as an indicator electrode in potentiometric titration of La3＋ with EDTA and satisfactory results were achieved.