乙醇水溶液析相萃取分离和富集TlCl_4^-

Extraction separation and enrichment of TlCl_4^- in ethanol aqueous solution by phase separation

研究了乙醇-(NH4)2SO4-罗丹明B体系析相萃取和富集Tl(Ⅲ)的行为及与一些金属离子分离的条件。(NH4)2SO4能使乙醇的水溶液分成两相,在分相过程中,TlCl4-与罗丹明B(RhB)生成的[TlCl4-][RhB+]能被乙醇相完全萃取。当溶液中罗丹明B,(NH4)2SO4和乙醇分别为0.28 mg/mL,0.30 g/mL和质量分数30%时,Tl(Ⅲ)的萃取率达到97.9%以上,Co(Ⅱ),Pb(Ⅱ),Fe(Ⅲ),Mg(Ⅱ),Ru(Ⅲ),Ni(Ⅱ),Cr(Ⅲ),Ag(Ⅰ)和Cu(Ⅱ)基本不萃取,实现了Tl(Ⅲ)与上述金属离子的分离。方法已应用于合成水样中Tl(Ⅲ)的分离和测定。

The behavior and conditions of extraction separation and enrichment of thallium from other metal ions in ethanol-（ NH4 ）2SO4-Rhodamine B system were studied. The results showed that the ethanol-water solution could be well divided into two phases with the action of （ NH4 ） 2SO4. The associated [ TlC14 - ] RhB ＋ ] formed with TIC14 - and Rhodamine B could be completely extracted during this process. T1 （ Ⅲ ） could be quantiatively separated from Co（ Ⅱ）,Pb（ Ⅱ）,Fe（Ⅲ）,Mg（ Ⅱ）,Ru（i）,Ni（Ⅱ）,Cr（Ⅲ）,Ag（ I ） and Cu（Ⅱ） by extraction,and values of extraction percentage of TI （ Ⅲ ） was over 97.9%. when the concentrations of Rhodamine B, （NH4 ）2SO4 and ethanol in solution were 0. 28 mg/mL,0. 30 g/mL and 30%, respectively. The mothod has been applied to the determination of thallium in synthetic water sample.