基于2,4-二羟基苯甲酸铜(Ⅱ)为载体的硫氰酸根电极的电位响应  

Potential response of a thiocyanate-selective electrode based on 2,4-dihyoxybenzoic acid-Cu(Ⅱ) as a carrier

作　　者：伍永梅 许文菊[1] 袁若[1] 

机构地区：[1]重庆市现代分析化学重点实验室,西南大学化学化工学院,重庆400715

出　　处：《化学传感器》2012年第2期16-20,共5页Chemical Sensors

基　　金：国家自然科学基金资助项目(21075100);西南大学博士基金(批准号:SWU109026)资助

摘　　要：制备了基于一种简单的金属铜配合物2,4-二羟基苯甲酸铜(Ⅱ)(Cu(Ⅱ)DHBA)为载体的PVC膜硫氰酸根离子(SCN-)选择性电极。该电极在1.0×10-1～1.0×10-6mol/LSCN-浓度范围内呈现斜率为-59.5mV/dec的近Nernst电位响应,检测下限为9.1×10-7mol/L。利用紫外可见光谱及交流阻抗技术初步探讨了电极对SCN-呈现的选择性电位响应机理。该电极作为直接电位分析法的指示电极,成功运用于实验室废水中硫氰酸盐含量的测定。A PVC membrane thiocyanate （SCN-） ion-selective electrode based on a simple metal copper complex, 2,4-dihyoxybenzoic acid-Cu（ Ⅱ ） （Cu（ Ⅱ ）DHBA）, as a sensing carrier was prepared. The resulted electrode displayed a near-Nernst potential response in a linear range of1.0×10^-1～1.0×10^-6mol/Lwith a slope of -59.5 mV/dec and a detection limit of 9.1 × 10^-7 mol/L. The selective potential response mechanism was discussed by UV-Vis spectrum and AC impedance technique. The proposed electrode as an indicator electrode in direct potentiometry was successfully applied to the determination of thiocyanate in wastewater .

关 键 词：2 4--二羟基苯甲酸铜(Ⅱ)(Cu(Ⅱ)DHBA) 硫氰酸根 电位响应 离子选择性电极 

分 类 号：TQ261.2[化学工程—有机化工]