二(2-乙基己基)单(或二)硫代磷(膦)酸对示踪量镅和稀土元素的萃取

二(2-乙基己基)单(或二)硫代磷(膦)酸对示踪量镅和稀土元素的萃取

摘要

摘要: 研究了二（２－乙基己基）二硫代磷酸（ＤＥＨＤＴＰ）、二（２－乙基己基）单硫代磷酸（ＤＥＨＭＴＰ）和二（２－乙基己基）单硫代膦酸（ＤＥＨＭＴＰＩ）对Ａｍ３＋、Ｎｄ３＋、Ｅｕ３＋、Ｔｍ３＋的萃取，给出了ｌｇＤ对ｐＨ和ｌｇｃ（ＨＡ）的关系图。通过比较半萃取ｐＨ值和分离系数，表明３种萃取剂对４种离子的萃取能力依次为：ＤＥＨＭＴＰＩ＞ＤＥＨＭＴＰ＞ＤＥＨＤＴＰ，但只有ＤＥＨＤＴＰ优先萃取Ａｍ３＋。对镅萃取选择性的顺序为：ＤＥＨＤＴＰ＞ＤＥＨＭＴＰＩ＞ＤＥＨＭＴＰ。此结果再次说明，Ａｍ３＋是比Ｌｎ３＋“软”一些的硬酸。

Abstract: EXTRACTION OF TRACE Am(Ⅲ) AND Ln(Ⅲ) WITH DI(2ETHYLHEXYL)MONO(DI)THIOPHOSPHORIC(PHOSPHINIC) ACIDXu Qichu Zhang Lixing Yang Yusheng(Northwest Institute of Nuclear Technology,Xi'an 710024)ABSTRACTThe extractants,such as di(2ethylhexyl)dithiophosphoric acid(DEHDTP),di(2ethylhexyl) monothiophosphoric acid (DEHMTP) or di(2ethylhexyl) monothiophosphinic acid (DEHMTPI) containing softer donor S atom in xylene solution,are used for the extraction of Am3＋ and Ln3＋.The order of the extractibility of Am3＋ and lanthanide metal ions by these extractants is DEHMTPI>DEHMTP>DEHDTP.The order of extraction selectivity of Am3＋ is DEHDTP>DEHMTPI>DEHMTP.The results show that Am3＋ is “softer” hardacid than Ln3＋。Key words Extraction Americium Lanthanides Thiophosphoric(phosphinic) acid

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