前言自从发现协同萃取以来,许多作者对协同萃取进行了广泛的研究。Reddy等人应用亚砜等中性萃取剂研究了两种中性萃取剂的协同萃取(以下简称B-B类协萃),认为在第一萃取剂(S~Ⅰ)浓度([S~Ⅰ])固定时,萃取分配比D的对数值对第二萃取剂(S~Ⅱ)的浓度([S~Ⅱ])的对数值作图是直线,其斜率为S~Ⅱ的溶剂化数n,随[S~Ⅰ]的增加直线斜率逐渐下降。似乎难以用斜率分析法来确定溶剂化数目。本文研究了二-正-辛基亚砜(以下简称DOSO),TBP和TOPO从NH_4SCN溶液中萃取Ce(Ⅲ)。分析了实验数据,提出了B-B类协萃分配比D的计算公式。 Introduction Since the discovery of synergistic extraction, many authors have conducted extensive research on synergistic extraction. Reddy et al. Studied the synergistic extraction of two neutral extractants using a neutral extractant such as sulfoxide (hereinafter referred to as the BB extract), suggesting that at the first extractant (S ~ I) concentration ([S ~ I]), When fixed, the logarithm of the ratio D of extractant to the logarithm of the logarithm of the concentration of the second extractant (S ~ II) ([S ~ II]) plotted as a straight line with a slope of the solvation number n of S ~ II [S ~ I] increase the slope of the straight line gradually decreased. It seems difficult to use slope analysis to determine the number of solvates. In this paper, di-n-octyl sulfoxide (hereinafter referred to as DOSO), TBP and TOPO extraction of Ce (Ⅲ) from NH_4SCN solution. The experimental data are analyzed, and the formula for calculating the distribution ratio B-B is proposed.