铊在丙醇-氯化钠-罗丹明B体系中的析相萃取分离和富集

Phase extraction separation and enrichment of thallium in propanol-sodium chloride-rhodamine B system

研究了丙醇-氯化钠-罗丹明B体系析相萃取和富集铊的行为及铊与一些金属离子分离的条件。结果表明,氯化钠能使丙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+]能被丙醇相完全萃取。当溶液中罗丹明B、氯化钠的质量浓度分别为0.26mg/mL、0.17g/mL和丙醇的体积分数为30%时,Tl3+的萃取率达到98.7%以上,Ni2+、Cu2+、Ru3+、Co2+、Fe3+、Cr3+、Mg2+和Ag+基本不被萃取,实现了Tl3+与上述金属离子的分离。对合成水样中铊的分离和测定,效果良好。

The behaviors of phase extraction and enrichment of thallium in the propanol-sodium chloride-rhodamine B system and the conditions for separation of thallium from some metal ions were studied.The results showed that sodium chloride could divided the aqueous solution of propanol into two phases,and in the phase separation,TlCl4-and rhodamine B （RhB） could form [TlCl4-][RhB＋]which could be completely extracted by propanol phase.When the mass concentrations of rhodamine B and sodium chloride were 0.26 mg / mL and 0.17 g / mL,respectively,and the propanol volume fraction was 30％ in the solution,Tl3＋ achieved an extraction rate of 98.7 ％ or more,and Ni2＋,Cu2＋,Ru3＋,Co2＋,Fe3＋,Cr3＋,Mg2＋ and Ag＋ were basically not extracted,so the separation of Tl3＋ from the metal ions was achieved.Synthetic water samples were tested for separation and determination of thallium,and the results were satisfactory.