芳香族二胺聚合物修饰电极对痕量重金属离子的络合与探测  

Complexation and Detection of Trace Heavy Metal Ions with Poly(aromatic diamine)Modified Electrodes

作　　者：黄美荣[1] 刘睿[1] 李新贵[1] 

机构地区：[1]同济大学材料学院混凝土材料研究实验室材料化学研究所,上海200092

出　　处：《分析测试学报》2005年第2期109-113,共5页Journal of Instrumental Analysis

基　　金：国家自然科学基金资助项目(20274030)

摘　　要：电合成的芳香族二胺聚合物链中存在大量自由氨基和亚氨基, 由其自组装而成的修饰电极可以和重金属离子如Ag+、Pb2 +、Hg2 +、Cu2 + 形成络合物, 进而实现对痕量重金属离子的富集与探测。该修饰电极对Ag+ 和Pb2 + 的探测呈现极好的线性关系, 线性相关系数在0.998左右, 探测极限分别可低达10 nmol/L和0.15μmol/L。电极上修饰聚合物膜厚度、富集时间、pH、共存金属离子等因素都会影响重金属的富集和探测。芳香族二胺聚合物修饰电极在痕量金属离子的探测、污水处理乃至重金属离子传感等方面都显示出极大的应用潜力。Electrosynthesized polymers from aromatic diamines possess abundant free amine groups and imine groups in their chains.Therefore these polymer-modified electrodes formed via self assemblycan formcomplexˉes with several heavy metal ions such as Ag + ,Pb 2+ ,Hg 2+ ,and Cu 2+ .These characteristics make it possible for the electrodes to concentrate and detect trace amounts of heavy metal ions in dilute solutions.The calibraˉtion plots for detection of Ag + and Pb 2+ with the modified electrodes were linear with correlation coefficients of ca.0.998.The detection limits for Ag + and Pb 2+ were as lowas10nmol/Land0.15μmol/L,respectively.Some important factors,such as the modified-filmthickness,preconcentration time,pH and the presence of other heavy metal ions,had a significant influence on the concentration and detection for the metal ions.Poly(aromatic diamine)-modified electrodes have shown potential applications in detection of trace heavy metal ions and the treatment of polluted water,and they can be as heavy metal-ion sensors.

关 键 词：芳香族二胺 修饰电极 重金属离子 络合物 

分 类 号：O657.1[理学—分析化学]