Solvent Extraction of Polonium(IV) with Tributylphosphate (TBP)

摩尔浓度 化学 萃取(化学) 盐酸 溶剂萃取 溶剂 配合物的稳定常数 分子 分析化学(期刊) 无机化学 核化学 色谱法 放射化学 物理化学 水溶液 有机化学
作者
Ali Younes,Cyrille Alliot,B. Mokili,David Deniaud,Gilles Montavon,Julie Champion
出处
期刊:Solvent Extraction and Ion Exchange [Taylor & Francis]
卷期号:35 (2): 77-90 被引量:15
标识
DOI:10.1080/07366299.2017.1279917
摘要

The extraction mechanism of Po(IV) from hydrochloric acid (HCl) solution by tributylphosphate (TBP) and trioctylamine (TOA) was investigated as a function of acid (0.1–12 mol/kg) and extracting agent (0.36–3.64 M) concentrations. Experimental data were modeled to determine the extraction mechanisms as well as the associated thermodynamic constants. Preliminary extraction experiments were carried out using tri-n-octylamine (TOA) in order to determine the activity-corrected Ringbom coefficient in concentrated HCl. The results showed the existence of a species involving two TOA molecules, , which dominated organic polonium speciation in concentrated HCl (9–12 mol/kg). Then, we determined the complexation coefficient of as a function of HCl concentration in order to calculate molality for a known total concentration of polonium. The obtained information was used to determine the extraction mechanism occurring in the presence of TBP. The theoretical model agrees with the experimental results considering the existence of the following extracted polonium species: and in the acidic ranges of 0.1–1 and 2–9 mol/kg, respectively. Another extracted species seems to exist in intermediate HCl molality. However, the number of TBP molecules and the associated thermodynamic extraction constant could not be determined. Taken together, the data enable us to propose that the extraction scheme of polonium by TBP corresponds to the following two reactions:
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