硫氰酸根离子电极的研究与应用

通过合成水杨醛缩4-氨基安替比林Schiff碱金属配合物，并以此为载体研究该电极对阴离子的电位响应特性，同时采用紫外光谱技术和交流阻抗研究电极的响应机理。发现以水杨醛缩4-氨基安替比林合铜（Cu（Ⅱ）-SAMT]）为载体的离子选择性电极对硫氰酸根离子呈现优良的电位响应和反Hofmeister选择性序列：SCN^-〉Sal^-〉ClO4^-〉NO3^-〉Cl^-〉Br^-〉I^-〉SO3^2-〉No2^-〉SO4^2-。在pH=4．0的磷酸盐缓冲体系中，硫氰酸根离子在1．0×10～1．0×10^-6 mol／L浓度范围内呈近能斯特响应，斜率为-55．64mV／pSCN^-（26℃），检测下限为6．3×10^-7 mol／L。并将电极应用于蔬菜中硫氰酸盐的测定，结果比较满意。

Study and application on thiocyanate selective electrode

Synthesize the alkali metal complex of salicylaldehyde-4-amino quinizine Schiff base,and use it as the carrier to study the potentiometric response characters to anion of the electrodes.Meanwhile,the electrode response mechanism was investigated with UV spectroscopy and ac impedance techniques.It is found that the electrode based on salicylaldehyde-4-amino quinizine copper(II) Cu(II)-SAMT] exhibited an excellent potentiometric response to the thiocyanate ion and the anti-Hofmeister selectivity sequence in ...