以1,1′-联萘并-20-冠-6为载体的钾离子选择电极  

Potassium Ion-Selective Electrode Based on 1,1′-Binaphthyl-20-crown-6

作　　者：颜振宁[1] 周稚仙[1] 吴养洁[1] 

机构地区：[1]郑州大学化学系,河南郑州450052

出　　处：《分析测试学报》2004年第2期48-51,共4页Journal of Instrumental Analysis

基　　金：国家自然科学基金资助项目 (29872034) ;郑州大学青年骨干教师基金资助项目

摘　　要：报道了1,1′_联萘并_20_冠_6为钾离子载体的聚氯乙烯 (PVC)膜电极的研制 ;研究了电极膜中增塑剂种类及载体和离子定域体 (KTpClPB)含量对电极性能的影响 ;得到了电极膜中各组分的最佳质量比为w(载体)∶w(PVC)∶w(DOS)∶w(KTpClPB)=1.6∶32.5∶65.0∶0.9 ;该选择电极对钾离子有良好的能斯特响应性能和高选择性 ,线性响应范围为10 -4～10 -1mol/L ,斜率为58.1mV/p +Kc ;电极具有优良的重现性和较宽的 pH使用范围 ;将该电极用于药品中钾离子含量的测定 ,其结果与原子吸收法一致。This paper reports a new potassium ion-selective electrode with polyvinyl chloride membrane using 1,1′-binaphthyl-20-crown-6 as the ionophore. The effects of various plasticizers and amounts of the incorporated ionophore and ionic additive(KTpClPB) on the response characteristics were studied. The electrode containing 1.6% ionophore, 32.5% PVC, 65.0% DOS and 0.9% KTpClPB was found to have the best performance towards K+. The K+-PVC electrode exhibits good Nernst response characteristics and fairly good selectivity towards K+. Its linear response range is 10-4～10-1 mol/L, and the corresponding slope is 58.1 mV·decade-1. The electrode has the advantages of good stability, repeatability and wider pH range. It can be used for the determination of K+ in potassium penicillin-V tablets. The results obtained by this method are in agreement with those from atomic absorption spectrophotomertic analysis.

关 键 词：钾离子选择电极 1 1′-联萘并-20-冠-6 聚氯乙烯膜电极 增塑剂 载体 离子定域体 青霉素V钾 片剂 含量测定 

分 类 号：R978.11[医药卫生—药品] R927.2[医药卫生—药学]