硫酸铵存在下的丙醇-水体系萃取分离镉  

Study of n-Propyl Alcohol-Water System in Extraction Separation for Cd^(2+) with Iodide and Ethyl Violet in the Presence of(NH_4)_2SO_4

作　　者：张焱[1] 侯玉霞[1] 

机构地区：[1]河南科技学院化学化工学院,河南省新乡市华兰大道东段453003

出　　处：《光谱实验室》2008年第3期331-334,共4页Chinese Journal of Spectroscopy Laboratory

摘　　要：研究加入表面活性剂乙基紫(EV)后,在丙醇-水双水相体系中影响Cd2+分离的酸度、无机盐、卤离子种类等条件。试验表明:(NH4)2SO4存在下,无表面活性剂EV,Cd2+的萃取率只有68%,而同样条件下,加入m g级表面活性剂EV后,Cd2+与EV、I-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50μg/10mL和100μg/10mL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 n-propyl alcohol-water extraction system consisted of iodide and ethyl violet in the presence of （NH,）2SO, was studied, the experimental conditions of phase separation of n-propyl alcohol and water were optimized. The charged complex compound CdI4^2- forms a kind of ionassociation complex with ethyl violet,and easily extracted into the n-propyl alcohol phase. Cd^2＋ can be completely separated from Fe^3＋, Co^2＋, Ni^2＋, Mn^2＋, Zn^2＋ and Cr^3＋ by adding 2.0g （NH4）2SO4, 0. lg KI,0. 40mL of 5.0mol/L ethyl violet at pH=l. 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]