香草醛缩氨基硫脲为中性载体的铬离子选择性电极的研究  

Study on a novel chrome-selective membrane electrode based on complex of 3-methoxy-4-hydroxybenzaldene-hydrazine-carbothioamide as neutral carrier

作　　者：张云[1] 袁若[1] 柴雅琴[1] 张敏[1] 

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

出　　处：《化学传感器》2007年第1期36-38,共3页Chemical Sensors

基　　金：国家自然科学基金(206705064);重庆市自然科学基金资助项目(CSTC-2005BB4100);西南大学高新技术培育基金(XSGX02;XSGX0603)资助项目

摘　　要：合成了香草醛缩氨基硫脲并以此做中性载体研制了PVC膜铬离子选择性电极。在pH=3.0的硝酸体系中,电极电位呈现近能斯特响应,线性响应范围为3.0×10-5～1×10-1mol/L,斜率为20.8mV/dec(20℃),检测下限为1.5×10-5mol/L。电极具有较好的稳定性和重现性。该电极用于EDTA的电位滴定其结果令人满意。A new selective chrome PVC membrane electrode based on 3 -methoxy- 4- hydroxybenzaldene- hydrazine - carbothioamide as a neutral carrier is described, which exhibits high selectivity for chrome over many other common cation. The electrode exhibits a near - Nernstian potential linear range of 3.0 × 10^-5 - 1 × 10^ - 1 mol/L with a detection limit of 1.5 × 10^ -5 mol/L and a slope of 20.8 mV/dec in pH = 3.0 nitric acid solution. The electrode is successfully used as indicator electrode in the potentiometric titration of chrome ions with EDTA.

关 键 词：香草醛缩氨基硫脲 铬离子选择性电极 中性载体 

分 类 号：X832[环境科学与工程—环境工程]