期刊
PURE AND APPLIED CHEMISTRY
卷 73, 期 12, 页码 2039-2046出版社
INT UNION PURE APPLIED CHEMISTRY
DOI: 10.1351/pac200173122039
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Flat-sheet-supported liquid membranes incorporating lasalocid A (a natural ionophore), were previously shown to be permeable to metal cations (Cd2+ and Zn2+) against a proton gradient (DeltapH), which is the driving force of the process [ I]. This transport process has been extended to other metal species such as Pb2+, Na+. and Ag+ and also to the case where two metal species compete for transport. A higher transport flux for Pb2+ as compared to Cd2+ and Zn2+ is observed and partly explained by a higher rate of interfacial complexation owing to the smaller hydration shell of this species. This effect is confirmed by the data obtained with Ag+. However, the size of the metal cation in relation to its hydration shell does not appear as the major parameter to take into account for an estimate of the trans-membrane transport efficiency, as the Na+ ions escape to this behavior, which has been considered until now as a general trend for metal cation ionophores.
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