研究了二 (2 乙基己基 )单硫代磷酸 (D2EHMTPA) 三辛胺 (TOA)混合萃取剂萃取镉锌的机理。电导滴定、红外和核磁共振谱以及等摩尔系列法等实验表明 ,D2EHMTPA与TOA混合形成离子缔合体 ,其萃取镉锌为反协同萃取 ,萃合物为CdA2 ·BHA和ZnA2 。萃取机理如下 :M2 ++ (2 +m)BHA(o) =MA2 ·mBHA(o) + 2B(o) + 2H+ (M2 + =Zn2 + 时 ,m =0 ;M2 + =Cd2 + 时 ,m =1)。 The mechanism of extraction of cadmium and zinc with a mixed extractant of di (2-ethylhexyl) monothiophosphoric acid (D2EHMTPA) and trioctylamine (TOA) was studied. Conductivity titration, IR and NMR spectra and equimolar series of experiments show that, D2EHMTPA and TOA mixed to form ion association, the extraction of cadmium and zinc for the anti-synergistic extraction, the extract was CdA2 · BHA and ZnA2. The extraction mechanism is as follows: m (m + 2) when M2 + = Cd2 +, m = 1).