HBMPPT(4-苯甲酰基 - 2 ,4二氢 - 5 -甲基 - 2 -苯基 - 3H -吡唑硫酮 - 3)或TOPO(三正辛基氧化膦 )的甲苯溶液 ,在HNO3介质中对三价镅和镧系元素在所研究的 pH范围内无明显的萃取能力 ,但当两者混合时 ,其协同效应可使该体系从镧系锕系混合溶液中有选择地萃取三价镅 (pH 3.5— 4 .5 ) ,两者的分离系数达 10— 15 6。实验结果还显示 ,代表三价锕系元素的镅和各镧系元素与该体系的化学反应机理也有所不同。 A toluene solution of HBMPPT (4-benzoyl-2, 4 dihydro-5-methyl-2-phenyl-3H- pyrazolethione-3) or TOPO (tri-n-octylphosphine oxide) Among them, trivalent acenaphthene and lanthanides have no obvious extraction ability in the studied pH range. However, when the two are mixed, the synergistic effect can make the system selectively extract the three valences from the lanthanide actinide mixed solution镅 (pH 3.5-4.5), the separation factor between the two reached 10- 15 6. The experimental results also show that the chemical reaction mechanisms of the 镅 and the lanthanides, which represent the trivalent actinides, are also different from the system.