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作 者:姜伟[1] 张宇虹[1] 李利勤[1] 颜振宁[1]
机构地区:[1]郑州大学化学系
出 处:《郑州大学学报(理学版)》2008年第2期87-90,94,共5页Journal of Zhengzhou University:Natural Science Edition
基 金:河南省杰出青年基金资助项目,编号74100510022;郑州市二七区科技攻关资助项目
摘 要:研究了以杯[4]芳烃衍生物(25,27-二[3-(5-甲基噻二唑基)硫代丙氧基]-26,28-二羟基-5,11,17,23-四叔丁基杯[4]芳烃)为载体的PVC铅离子选择电极的响应行为,结果表明:此电极对Pb2+具有优良的能斯特响应性能,在10-5~10-1mol/L的浓度范围内,响应斜率为30.4mV/decade,检测下限为3.1×10-6mol/L,碱金属、碱土金属及大多数过渡金属离子对铅离子的测定无干扰,电极有较好的稳定性和重现性.该电极可在体积分数不大于20%的甲醇水溶液中使用,可作为准确滴定铅离子的电位滴定指示电极,并能用于实际样品中铅含量的直接测定.The response characteristics of a new lead ion-selective poly(vinyl chloride) membrane electrode prepared by using 25,27-di[3-(5-methylthiadiazolethiooxypropyl)]-26,28-dihydroxyl-5, 11,17,23-tetra-p-tert-buthylcalix[4]arene as the ionophore is reported. The results show that the PVC electrode exhibits Nernstian response to Pb^2+ . The response slope is 30.4 mV/decade in the concentration range of 10^-5-10^-1 mol/L. The detection limit is 3.1 × 10^- 6 mol/L. The electrode has a highly selectivity for lead ion over alkali, alkline earth and common transition metal ions. The electrode has advantages of being stable and better reproducibility. The electrode can work in≤20% methanol aqueous solutions. The electrode is used as the indicator electrode in titration of lead ions and for the determination of lead content in real samples.
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