用二正戊基亚砜的甲苯溶液在硝酸溶液中对铀、钍和一些稀土元素进行了萃取研究。结果表明,稀土元素,即使与铀、钍同时存在于水相中,在0—10M硝酸中,也不被萃取。在所研究的情况中,二戊基亚砜对铀的萃取大大优于对钍的萃取,这使它们的分离成为可能。 Uranium, thorium and some rare earth elements were extracted from nitric acid solutions with di-n-pentylsulfoxide in toluene. The results show that rare earth elements, even with uranium, thorium present in the water phase, in 0-10M nitric acid, is not extracted. In the case studied, dipentylsulfoxide extracted uranium much better than thorium, which made their separation possible.