基于Schiff-base结构化合物载体的汞离子选择性电极的制备与表征  

Preparation and Characterization of a Mercury(Ⅱ)-selective Polymeric Membrane Electrode

作　　者：张军[1,2] 赵月前[1] 丁家旺[1] 秦伟[1] 

机构地区：[1]中国科学院烟台海岸带研究所山东省海岸带环境过程重点实验室,山东烟台264003 [2]海南医学院热带医学与检验医学院,海南海口571101

出　　处：《分析测试学报》2011年第2期207-212,共6页Journal of Instrumental Analysis

基　　金：863国家高技术发展计划资助项目(2007AA09Z103)

摘　　要：高产率合成了一种新的Schiff-base结构化合物，并将其表征为高选择性聚合物膜汞离子选择性电极载体。考察了不同增塑剂及离子交换剂对膜电极响应性能的影响，在最佳膜组分条件下测得该电极对汞离子的线性响应范围为1．0×10^-6-3．0×10^-4mol／L，响应斜率为（29．3±0．3）mV／dec，检出限为2．6×10^-7mol/L；该电极响应速率快（小于12s），可在较宽的pH范围内（pH2．8～5．6）使用，且其它常见碱金属、碱土金属以及过渡金属离子对该测试电极的干扰小；可准确检测自来水中汞离子的浓度。A new Schiff-base compound derived from 1, 2, 4-triazole was synthesized with a high yield. Potentiometric responses of poly （vinyl） chloride （PVC） electrode based on this ligand as neutral ionophore showed high sensitivity and selectivity towards Hg^2＋ ion. Effects of different plasticizers and amounts of ion-exchanger on the potentiometric response property of Hg^2＋-selective electrode （Hg^2＋ -ISE） were discussed. The result indicated that, under the optimal membrane composition [PVC： 32.70, o-NPOE： 65.39, ionphore： 0.99, ion-exchanger： 0. 92, （w ： w）], a good Nernstian response slope of （ 29.3 ± 0. 3 ） mV/dec was obtained for Hg^2 ＋ in a wide concentration range of 1.0 × 10 ^-6 - 3.0 × 10^ -4 mol/L with a detection limit of 2.6 × 10^ -7 moL/L. Except for silver ion, most of alkali metal, alkaline earth metal and other common transition metal ions didn＇t interfere the performance of the membrane electrode. The fabricated Hg^2＋ - ISE can be used in a wide pH range of 2. 8 -5.6 with a fast response time of tess than 12 s and can be used for 3 month without any obvious change in potentiometrie response. The proposed electrode was also successfully applied as indicator electrode in the potentiometric detection of Hg^2＋ in lab water by standard addition method and the results were confirmed by ICP- MS.

关 键 词：离子选择性电极 汞离子 SCHIFF-BASE 

分 类 号：O657.1[理学—分析化学] O614.243[理学—化学]