低检出限聚合物膜镉离子选择性电极的研制及应用  

Preparation and application of a polymeric membrane cadmium ion-selective electrode with a low detection limit

作　　者：王倩文[1,2] 于顺洋[1] 梁荣宁[1,2] 王学伟[1,2] 张军[1,2] 秦伟[1] 

机构地区：[1]中国科学院烟台海岸带研究所,烟台264003 [2]中国科学院研究生院,北京100049

出　　处：《分析试验室》2011年第10期34-37,共4页Chinese Journal of Analysis Laboratory

基　　金：教育部留学回国人员科研启动基金项目;国家自然科学基金项目(40776058);国家高技术研究发展计划(863计划)项目(2007AA09Z103)资助

摘　　要：基于痕量电位分析原理,研制出了一种新型的聚合物膜镉离子选择性电极。通过优化电极内充液组成及聚合物膜组分,电极在10-8～10-4mol/L镉浓度范围内呈现良好的能斯特响应,响应斜率为24.9 mV/dec.,检出限可达5.9 nmol/L。该电极应用于实际湖水样品中镉含量的检测,结果与ICP-MS法数据较为吻合。A polymeric membrane ion-selective electrode with lower detection limit has been fabricated for sensitive and selective determination of Cd2＋.The influences of the composition of internal solution and membrane on the response of Cd2＋-selective electrode have been studied.Under the optimized conditions,the proposed electrode exhibits Nernstian responses to Cd2＋ in the concentration range of 10-8~10-4mol/L with a slope of 24.9 mV/dec.,and the detection limit is 5.95 nmol/L.The proposed electrode has been successfully used for the determination of trace Cd2＋ in lake water and the results have agreed well with those obtained by ICP-MS.

关 键 词：镉 离子选择性电极 低检出限 湖水 

分 类 号：O657.1[理学—分析化学]