酯与离子液体[bmim]BF_4二元双水相体系金属镉(Ⅱ)的萃取分离及测定  

Cd(Ⅱ) Extraction-Separation and Determination by Using Ester with Ionic Liquid Binary Aqueous Two Phase System

作　　者：李鑫垚[1] 李豪[1] 侯延民[2] 

机构地区：[1]郑州大学化学与分子工程学院,河南郑州450001 [2]平顶山学院化学与环境工程学院,河南平顶山467099

出　　处：《平顶山学院学报》2017年第2期41-46,共6页Journal of Pingdingshan University

摘　　要：Cd(Ⅱ)与碘化钾形成离子化合物CdI_42-,与罗丹明B结合形成离子缔合物(RhB)2(CdI_4),此缔合物在一定条件下,可采用酯与离子液体[bmim]BF4二元双水相体系从目标混合物中实现高效萃取分离,方法用于测定天然水中重金属Cd(Ⅱ)的含量,检测限3.16×10-7mol/L.研究了试剂用量对三元缔合物形成的影响以及温度和酸度对离子液体-双水相萃取体系的影响,得到了Cd(Ⅱ)、KI、RhB三元缔合物(RhB)2(CdI_4)的最佳生成条件以及二元双水相体系的最佳萃取条件.The ionic compound of CdI4^2-can be formed for Cd（Ⅱ） in the presence of KI. A ternary complex of（ Rh B）2（ CdI4） is produced for CdI4^2-under given conditions with Rh B. It could be separated from the mixture efficiently by the system of ester with ionic liquid binary aqueous two phase. This method can be utilized to determine the concentration of Cd（ Ⅱ） in natural water. The detection limit is 3. 16 × 10^-7mol/L. Moreover,the influence of reagent dosage on the formation of ternary complex,and the influence of reaction temperature and acidity on ionic liquid binary aqueous two phase system are also investigated. The best reaction condition for the formation of ternary complex,and the extraction condition of ionic liquid binary aqueous two phase system are obtained.

关 键 词：镉(Ⅱ) 离子液体 二元双水相萃取 三元缔合物 

分 类 号：O658.2[理学—分析化学]