用氨基酸共聚物/氰桥配位聚合物修饰电极同位镀铋溶出伏安法测定微量铅、镉离子  

Determination of Trace Lead and Cadmium Ion at an Aminoacid Copolymer/Cyano-bridged Coordination Polymers Modified Electrode by Using in-situ Plating Bismuth Stripping Voltammetry

作　　者：马旭花 杨佳 马永钧[1] Ma Xuhua;Yang Jia;Ma Yongjun(College of Chemistry&Chemical Engineering,Northwest Normal University,Lanzhou 730070,China)

机构地区：[1]西北师范大学,化学化工学院,甘肃兰州730070

出　　处：《广东化工》2021年第9期227-229,共3页Guangdong Chemical Industry

基　　金：国家自然科学西部基金项目(21862019)资助。

摘　　要：本文在玻碳电极基底上,采用多重电化学聚合法制备了氨基酸共聚物/含钕离子杂金属氰桥配位聚合物复合修饰电极(Aminoacid copolymer/Nd(III)-Fe(III)-WO42-Cy HMCPs/GCE)。在此工作电极上,用示差脉冲伏安法研究了Pb^(2+)、Cd^(2+)的阳极溶出伏安行为,利用同位镀铋法解决了待测离子间的相互干扰。基于这种环境友好的伏安测定原理,建立了无汞电化学法同时测定微量Pb^(2+)、Cd^(2+)的新方法,可将Pb^(2+)、Cd^(2+)的定量检测范围扩展至四个数量级;Pb^(2+)、Cd^(2+)溶出峰电流值与其浓度在0.01~1.0μmol/L、1.0~100μmol/L范围内呈现两段线性关系,检出限(S/N=3)分别为4.4、3.3 nmol/L。In this paper, aminoacid copolymer/neodymium-containing cyano-bridged heterometallic coordination polymers composite modified glassy carbon electrode(aminoacid copolymer/Nd(III)-Fe(III)-WO42-Cy HMCPs/GCE) was prepared by using the multi-step electrochemical polymerization method. On this composite modified electrode, the differential pulse voltammetry(DPV) was applied to study the anodic stripping voltammetric behavior of two heavy metal ions in their mixture solutions, and the mutual interference due to the coexistence of heavy metal ions was completely eliminated by using in-situ plating bismuth measure mode. Based on this environmentally friendly principle of voltammetry, a mercury-free analytical technique for simultaneous determination of trace Pb^(2+) and Cd^(2+)was proposed, which could extend the quantitative range of Pb^(2+)and Cd^(2+) to the four orders of magnitude. There was a two-stage linear relationship between the stripping peak current of Pb^(2+) and Cd^(2+) and their concentrations in range from 0.01~1.0 μmol/L and 1.0~100 μmol/L, the detection limit(LOD, S/N=3) were 4.4 nmol/L and 3.3 nmol/L.

关 键 词：复合修饰电极 氰桥配位聚合物 示差脉冲伏安法 阳极溶出分析 重金属离子 

分 类 号：TQ[化学工程]