1-苯基-3-甲基-4-(α-呋喃甲酰基)-5-吡唑酮与中性磷萃取剂对钍(IV)的协同萃取

SYNERGISTIC EXTRACTION OF THORIUM (IV) WITH 1-PHENYL-3-METHYL-4-(α-FUROYL)-5-PYRAZOLONE AND NEUTRAL ORGANOPHOSPHOROUS EXTRACTANTS

研究了１－苯基－３－甲基－４－（α－呋喃甲酰基）－５－吡唑酮（ＨＰＭＦＰ，ＨＡ）与氧化三正辛基膦（ＴＯＰＯ，Ｂ）或氧化三苯基膦（ＴＰＰＯ，Ｂ）的甲苯溶液从硝酸介质中对钍（ＩＶ）的协同萃取行为．用斜率法确定了ＨＡ－ＴＰＰＯ－Ｃ６Ｈ５ＣＨ３体系萃取钍（ＩＶ）的协萃配合物组成为ＴｈＡ４·ＴＰ－ＰＯ，求得了体系的协萃平衡常数。

The synergistic extraction of Th(Ⅳ) from nitrate medium with 1phenyl3methyl4(αfuroyl)5pyrazolone (HPMFP, HA) and trioctylphosphine oxide (TOPO, B) or triphenylphosphine oxide (TPPO, B) in toluene has been studied at (25±0.5)℃. The experiment shows that the ability to extract Th(Ⅳ) using HA and TOPO in toluene is so strong that the appropriate acidic range does not exist for studying the composition of the synergistic extracted species. In HATPPOC6H5CH3 system, by using the slope method, the composition of the synergistic extracted species is shown to be ThA4·TPPO and its synergistic extraction equilibrium constant (lgKs.e) is calculated to be 11.52±0.08. A possible structure of the synergistic extracted species is proposed. Moreover, the extraction ability for Th(IV) with HA and TPPO is also compared among various solvents. 