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.
出处
《分析测试学报》
CAS
CSCD
北大核心
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)
