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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 of ethanol - (NH4) 2SO4-rhodamine B system by phase extraction and enrichment of Tl (Ⅲ) and the separation conditions from some metal ions were studied. (NH4) 2SO4 can separate the aqueous solution of ethanol into two phases. During the phase separation, [TlCl4 -] [RhB +] formed by TlCl4- and rhodamine B (RhB) can be completely extracted by the ethanol phase. When the concentration of rhodamine B, (NH4) 2SO4 and ethanol were 0.28 mg / mL, 0.30 g / mL and 30% respectively, the extraction rate of Tl (Ⅲ) was over 97.9% (Ⅲ), Cu (Ⅱ), Fe (Ⅲ), Mg (Ⅱ), Ru (Ⅲ), Ni (Ⅱ) Ion separation. The method has been applied to the separation and determination of Tl (Ⅲ) in synthetic water samples.