Di n-octyl phosphinic acid as a selective extractant for metallic cations: Selected M(III) and M(VI) tracer studies

摘要: Abstract Hydrogen ion dependencies and extractant of M(III) elements represented by Ce 3+ , Eu Tm Yb Y Am Cm an M(VI) element, UO 2 2+ into a benzene solution di n-octyl phosphinic acid, ( n -C 8 H 17 ) PO(OH), H[DOP], from aqueous acidic chloride medium have been determined radiometrically. The observed stoichiometries are as: M A +3 + 2·5(HY) 0 ⇌ MY(HY 3H +2 2(HY) (HY 2H where the subscripts O refer, respectively, to mutually equilibrated organic phases (HY) represents dimeric form H[DOP]. Values K s defined expressions: = [H ] 3 / F 2.5 for U (VI) is molar hydrogen concentration in phase, formal phase distribution ratio metal reported above 1·0 (NaCl HCl). Comparison values Pm(III), Cm(III) U(VI) systems involving (n-octyl) H[DOP]; 2-ethyl hexyl ethyl phosphonate, (2-ethyl 0) hexyl)PO(OH), HEH[EHP]; phosphoric (20-ethyl HDEHP, made. plot log vs. Z study all lanthanides (III) except Gd, shows slight odd-even effect, even lying straight line which acceptably odd- elements. It tentatively concluded that series: (GO) (GO)(G)PO(OH) if G remains fixed extraction increases slightly right while considered decreased markedly.