本文在考察一元烷基磷(膦)酸酯萃取钴、镍反应平衡常数与取代基结构的定量关系的基础上,提出了酸性磷(膦)酸酯萃取钴、镍反应中反映取代基结构空间效应为主的经验参数E_(PA)~(Co)和E_(PA)~(Ni)。这些新标度的建立,不仅使我们可用lgK_(ex)=ρΣσ~P+δE_(PA)~(Co(Ni))+C关系式来描述萃取钴、镍的反应性与取代基结构效应的关系,而且也为选择高效镍、钴分离萃取剂提供了新途径. In this paper, based on the quantitative relationship between the equilibrium constants of cobalt and nickel and the structure of the substituents extracted by monobasic alkylphosphonates (phosphonates), it is proposed that the reaction of cobalt and nickel with acidic phosphorus (phosphine) The empirical empirical parameters E_ (PA) ~ (Co) and E_ (PA) ~ (Ni). The establishment of these new scales not only allows us to describe the relationship between the reactivity of cobalt and nickel and the structure effect of the substituent by using the relation of lgK_ (ex) = ρΣσ ~ P + δE_ (PA) ~ (Co (Ni) Relationship, but also for the choice of efficient nickel, cobalt extractant provides a new way.