无机盐存在下双水相体系萃取分离碘-乙基紫-镉(Ⅱ)缔合物  

Study on Aqueous Two-phase Systems in Extraction Separation for Cd^(2+) with Iodide and Ethyl Violet in Presence of(NH_4)_2SO_4

作　　者：张焱[1] 侯玉霞[1] 王泽云[1] 

机构地区：[1]河南科技学院化工系,河南新乡453003

出　　处：《广东微量元素科学》2006年第11期51-55,共5页Trace Elements Science

摘　　要：研究了在丙醇-水体系中加入表面活性剂乙基紫(EV)后,影响Cd2+分离的酸度、无机盐、卤离子种类等条件。实验表明,(NH4)2SO4存在下,无表面活性剂EV,一定量的I-,在酸性条件下,Cd2+的萃取率为68%,而同样条件下,加入mg级表面活性剂EV后,Cd2+与EV、г形成三元缔合物,被均相萃取、异相分离;缔合物进入丙醇相,Cd2+被完全萃取分离;在pH 1.0时,试验了Cd2+加入量为5μg/mL时与Fe3+、Co2+、Ni2+、Zn2+、Mn2+、Zn2+、Cr3+的二元或多元离子混合液的分离试验,分离完全。A study on n-propyl alcohol-water extraction system consisted of iodide and ethyl violet in the presence of （NH4）2SO4 has been performed and proper conditions of phase separation of n-propyl alcohol and water were selected. The result shows that the charged complex compound CdI4^2- can form a kind of ion-association complex with ethyl violet, and it is easily extracted into the n-propyl alcohol phase. As a result, Cd^2＋ can be completely separated from Fe^3＋ , Co^2＋ , Ni^2＋ , Mn^2＋ , Zn^2＋ and Cr^3＋ by adding 2.0 g （NH4）2SO4 , 0.1 g KI, 0.40 mL of 5.0 × 10^-3 mol/L ethyl violet at pH 1.0 or pH 4.0.

关 键 词：双水相体系 乙基紫 镉 萃取分离 

分 类 号：O657.32[理学—分析化学]