The transport of Pt(IV) and Pd(II) through a supported liquid membrane (SLM) has been investigated by using an alkylated derivative of 8-quinolinol, LIX 26, as a mobile carrier. Platinum(IV) and Pd(II) were highly extractable with LIX 26 from the mineral acid solutions of H2SO4, HNO3 and HCl. Platinum(IV) was completely stripped by a weakly acidic solution, but Pd(II) entirely retained in the organic phase. In liquid membrane transport, Pt(IV) was completely transported through a LIX 26-SLM from mineral acid solutions into weakly acidic solutions. Palladium(II) was also extracted into the SLM from the HCl feed solution, while only a small portion of Pd(II) was stripped into the product solution. In the cases of H2SO4 and HNO3 feed solutions, no Pd(II) was stripped into the product solution. The recovery and separation of Pt(VI) from a Pd(II)-Pt(IV) solution were accomplished through an SLM impregnated with 15% (v/v) LIX 26 and 10% (v/v) 1-octanol in kerosene from a 1 M H2SO4 or HNO3 feed solution into a 0.5 M (H,Na)Cl2CHCOO product solution, in which Pt(IV) was transported into the product solution while Pd(II) was built up in the LIX 26-SLM.