硫酸铵存在下碘化物-结晶紫-丙醇体系萃取分离镉  

Separation of Cadmium by Iodide-Crystal Violet-n-Propyl Alcohol Extraction System in the Presence of Ammonium Sulphate

作　　者：李全民[1] 申义阳 张丽敏[1] 侯凤莲[1] 

机构地区：[1]河南师范大学化学系,新乡453002 [2]洛阳师范专科学校化学系

出　　处：《分析化学》1998年第9期1071-1074,共4页Chinese Journal of Analytical Chemistry

基　　金：河南省科委;省教委自然科学基金资助项目。

摘　　要：研究了在硫酸铵存在下，碘化物－结晶紫－丙醇体系萃取镉的行为以及丙醇水溶液的分相条件。试验表明，丙醇作为萃取溶剂，能萃取中性离子缔合物。调节溶液ｐＨ＝１． ０或 ｐＨ＝４．０，该体系能使 Ｃｄ２＋从常见过渡元素 Ｆｅ３＋、Ｃｏ２＋、Ｎｉ２＋、Ｍｎ２＋、Ｚｎ２＋、Ｃｒ３＋的混合液中分离出来。A study of the liquid-liquid extraction behaviour based on iodide-crystal violet-n-propyl alcohol in the presence of ammounium sulphate has been performed and proper conditions of phase separation of n-propyl alcohol and water were selected. It shows that the charged complex compound CdI2-4 can form a kind of ion-association complex with crystal violet, and it is easily extracted into the n- propyl alcohol phase. In this system, Cd2+ can be completely separated from Fe3+, Co2+, Ni2+, Zn2+ , Mn2+ and Cr3+ by adding 2.0 g (NH4)2SO4, 0. 1 g KI, 0.40 mL of 5.0× 10-3 mol/L crystal violet to 10.0 mL 30% (V/V) n-propyl alcohol solution at pH = 1 .0 or pH = 4 .0.

关 键 词：丙醇 结晶紫 碘化钾 镉 萃取 分离 测定 

分 类 号：O614.242[理学—无机化学] O652.62[理学—化学]