Abstract The extraction of nitric acid, trivalent actinides and lanthanides with N,N,N′,N′-tetra-n-octyl-3-oxapentanediamide (TODGA) dissolved in the aromatic diluents 1,4-diisopropylbenezene and tert-butylbenzene was studied. Nitric acid extraction proceeds along the formation of 1:1 and 2:1 HNO3-TODGA adducts. An(III) and Ln(III) distribution ratios were determined as a function of nitric acid, TODGA and Ln(III) concentrations. Distribution ratios are approximately an order of magnitude lower in aromatic diluents compared to aliphatic diluents. No third phase formation was observed when contacting the solvent with an aqueous phase containing 1.5 mol/L Er(NO3)3 in 2–4.3 mol/L HNO3. Slope analysis indicates the formation of 1:3 and 1:4 M(III):TODGA complexes. Using TRLFS, the formation of a previously unknown 1:2 complex in organic phases loaded with Ln(III) was observed for the first time.

中文翻译：

---

在芳香族稀释剂中使用 TODGA 溶剂萃取 An(III) 和 Ln(III) 以抑制第三相的形成

摘要 研究了溶解在芳香族稀释剂 1,4-二异丙基苯和叔丁基苯中的 N,N,N',N'-四正辛基-3-氧杂戊二酰胺 (TODGA) 萃取硝酸、三价锕系元素和镧系元素。 . 硝酸萃取沿着 1:1 和 2:1 HNO3-TODGA 加合物的形成进行。An(III) 和 Ln(III) 分布比被确定为硝酸、TODGA 和 Ln(III) 浓度的函数。与脂肪族稀释剂相比，芳香族稀释剂的分配比大约低一个数量级。当溶剂与在 2–4.3 mol/L HNO3 中含有 1.5 mol/L Er(NO3)3 的水相接触时，没有观察到第三相的形成。斜率分析表明形成了 1:3 和 1:4 M(III):TODGA 复合物。使用TRLFS，形成一个以前未知的1：