用磷酸三丁酯(TBP)作固定相反相萃取分离贵金属的缺点是TBP在水相中的溶解度较大。近年来,以含硫石油为原料的石油硫醚和石油亚砜的出现引起了人们对新型萃取剂——二烷基硫醚和二烷基亚砜的注意。目前,此类萃取剂已较成功地应用于放射性元素和稀有元素的分离。值得注意的是,这类萃取剂对亲硫金属具有特殊的萃取能力,远比TBP的分 The disadvantage of extracting the noble metal with TBP as the reversed-phase stationary phase is that TBP is more soluble in the aqueous phase. In recent years, the presence of petroleum thioethers and petroleum sulfoxides starting from sulfur-containing petroleum has attracted the attention of new extractants, dialkyl sulfides and dialkyl sulfoxides. At present, such extractants have been more successfully applied to the separation of radioactive elements and rare elements. It is noteworthy that these extractants have a special ability to extract sulfur-tolerant metals, far more than TBP