邻二氮菲-正丙醇-硫酸铵-抗坏血酸体系萃取分离和富集Fe(Ⅱ)

Enrichment and Extraction Separated of Fe(Ⅱ) by 1,10-phen anthroline-1-propanol-ammonium Sulphate-ascorbic Acid System

用可见分光光度法研究邻二氮菲-正丙醇-硫酸铵-抗坏血酸体系萃取分离和富集铁的行为及铁与一些金属离子分离的条件.结果表明,硫酸铵能使正丙醇的水溶液分成两相,在分相过程中,三元缔合物[Fe(phen)3]SO4能被正丙醇相完全萃取.当溶液中正丙醇、邻二氮菲和硫酸铵的浓度分别为30%(v/v)、7.0×10-4 mol/L和0.2 g/mL时,Fe(Ⅱ)的萃取率达到96.6%～98.4%,Co(Ⅱ)、Au(Ⅲ)、Ag(Ⅰ)、Ni(II)、Mg(Ⅱ)、Cr(Ⅲ)、Cu(Ⅱ)、Al(Ⅲ)、Hg(Ⅱ)、Pb(Ⅱ)和Cd(Ⅱ)基本不被萃取,实现了Fe(Ⅱ)与上述金属离子的分离.对合成水样中铁的分离和测定效果良好.

The behavior and conditions of extraction separation and concentration of ferrum from other metal ions by 1,10-phenanthroline-1-propanol-ammonium sulphate system-ascorbic acid were studied with visible spectrophotometry.The results showed that the 1-propanol aqueous solution could be well divided into two phases with the action of ammonium sulphate.The ternary complex [Fe（phen）3]SO4could be completely extracted during this process.Fe（Ⅱ）could be quantiatively separated from Co（Ⅱ）,Au（Ⅲ）,Ag（Ⅰ）,Ni（Ⅱ）,Mg（Ⅱ）,Cr（Ⅲ）,Cu（Ⅱ）,Al（Ⅲ）,Hg（Ⅱ）,Pb（Ⅱ） and Cd（Ⅱ） by extraction,and values of extraction rate of Fe（Ⅱ） reaches the 96.6%~98.4% when the concentrations of 1-propanol,1,10-phenanthroline and ammonium sulphate in solution are 30%（v/v）,7.0×10-4 mol/L and 0.20 g/mL,respectively.This method was used to extraction separation and determmation of ferrum in the sample of synthetic water with satisfactory resucts.