摘要
制备了一种新的基于硫氮杂冠醚化合物为载体的汞离子选择性电极,电位响应表明该电极对汞离子有好的选择性。在考察增塑剂以及离子交换剂对电极响应性能的基础上,以最佳膜组分测得该电极的线性响应范围为1.0×10-6~1.0×10-4mol/L,响应斜率为29.6±0.1 mV/dec.,检出限为6.5×10-7mol/L;该电极响应速率快（〈15 s）,其他常见碱金属、碱土金属以及过渡金属离子对该电极测试干扰很小,并可在较宽的pH（3.3~5.3）范围内使用;该电极可用作指示电极,以EDTA为滴定剂,准确滴定水体中汞离子的浓度。
A new mercury（Ⅱ）-selective electrode（Hg2＋-ISE） was prepared and characterized.Potentiometric responses show that this Hg2＋-ISE has high sensitivity and selectivity towards Hg2＋.The effect of different plasticizers and amounts of ion-exchanger on the response property of Hg2＋-ISE was also studied.With the optimal membrane composition,the sensor gives a good Nernst slope of 29.6±0.1 mV/decade in a wide concentration range of 1.0×10-6～1.0×10-4 M with a detection limit of 6.5×10-7 M Hg2＋.Selectivity study shows that alkali metal,alkaline earth metal and other common transition metal ions give negligible interference to the performance of the electrode.The fabricated Hg2＋-ISE can be used in a wide pH range of 2.4～5.6 with a fast response time of less than 15 s.The electrode was successfully applied as indicator electrode in the potentiometric titration of Hg2＋ with EDTA.
出处
《化学试剂》
CAS
CSCD
北大核心
2011年第9期837-840,共4页
Chemical Reagents
基金
国家自然科学基金资助项目(21007087)
关键词
汞离子
离子选择性电极
冠醚
mercury ion
ion-selective electrode
crown ether
