摘要
在pH>1条件下,采用EDTA容量滴定法测定D2EHPA-HCl-HAc体系萃取Pr(Ⅲ)过程两相中的Pr浓度分别考察溶液酸度和萃取剂浓度对Pr的分配比的影响,通过对D2EHPA以及D2EHPA-HCl-HAc体系负载Pr有机相进行红外光谱测试。分析探究了D2EHPA-HCl-HAc体系萃取Pr的机制,并确定萃取平衡常数。研究结果表明,当pH>1时,萃取过程的实质是Pr离子与基团P-OH发生置换,遵循阳离子交换机制,以及与基团P=O发生的络合配位作用,其萃取平衡常数KPr为1×100.13。
In the conditions of pH >1,Pr concentration was determined by volumetric precipitation method of EDTA in the two phase of D2EHPA-HCl-HAc extraction system,which was studied the effect on distribution ratio of Pr by the variety of acidy and extractant concentration.And by infrared spectrum testing and analysis of D2EHPA and the organic phase loading Pr in the D2EHPA-HCl-HAc extraction system,the effect on extraction mechanism of Pr in D2EHPA-HCl-HAc extraction system by acidy was also studied.Where-by,the...
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2010年第4期629-632,共4页
Chinese Journal of Rare Metals
