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研究了水杨醛缩硫脲合铜配合物[Cu(II)-HBDT]为中性载体的PVC膜阴离子选择性电极.该电极对硫氰酸根离子呈现出优良的电位响应性能和选择性,并呈现反Hof meister序列行为.其选择性序列从大到小为:SCN-,Cl O4-,Sal-,I-,NO3-,NO2-,Br-,Cl-,SO32-,Ac-,SO24-,电极在pH=5.0的磷酸盐缓冲体系中对SCN-在1.0×10-1～1.0×10-5mol/L浓度范围内呈近能斯特响应,斜率为-57.0 mV/dec,检测下限为4×10-6mol/L.采用交流阻抗、紫外光谱分析技术研究了阴离子与载体的作用机理,结果表明配合物中心金属原子的结构以及载体本身的结构与电极的响应行为之间有非常密切的构效关系.将该电极用于环境废水中SCN-的监测,获得满意的结果.
A PVC membrane anion selective electrode with neutralization of [Cu (II) -HBDT] salicylaldehydethiourea and copper (Ⅱ) complex was studied. The electrode exhibited excellent potential response and selectivity to thiocyanate ion, And showed the anti-Hof meister sequence behavior. The selectivity sequence descending order: SCN-, Cl O4-, Sal-, I-, NO3-, NO2-, Br-, Cl-, SO32-, Ac-, SO24 -, the electrode exhibits near-Nernstian response to SCN- in a pH = 5.0 phosphate buffer system at a slope of -57.0 mV / dec at a concentration of 1.0 × 10-1 to 1.0 × 10-5 mol / L with a lower detection limit Was 4 × 10-6mol / L. The interaction mechanism between anions and carriers was studied by AC impedance spectroscopy and UV spectroscopy. The results showed that there was a close relationship between the structure of the metal atoms in the center of the complexes and the structure of the carriers themselves and the response behavior of the electrodes Structure-activity relationship.The electrode was used for the monitoring of SCN- in environmental wastewater, and satisfactory results were obtained.