Abstract
Abstract A competitive proton-driven transport of alkali metal ions with co-transported picrate anion was investigated in a chloroform membrane system containing either dicyclohexano-18-crown-6 (DCl8C6), octadecylamine (C18NH2), or a DCl8C6/C18NH2 mixture as cooperative carrier. The cooperative carrier effectively transported K+ against its concentration gradient between the two aqueous phases. The DCl8C6 alone, though being a proton-unionizable carrier, also mediated the uphill transport of K+ when the receiving phase was strongly acidic. The mechanisms for these transport behaviors are discussed referring to additional data on the partitioning of species at membrane/aqueous phase interfaces.
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