Highly Selective Transport of a Uranyl Ion through a Liquid Membrane Containing a Lipophilic Ion-Associate of Methyltrioctylammonium and Hydroxycalix[n]arene-p-sulfonates(n=6,8) as Metal Carriers.

KONDO Hirotomo, NISHIDA Masashi, YOSHIDA Isao

doi:10.2116/analsci.18.113

Highly Selective Transport of a Uranyl Ion through a Liquid Membrane Containing a Lipophilic Ion-Associate of Methyltrioctylammonium and Hydroxycalix[n]arene-p-sulfonates(n=6,8) as Metal Carriers.

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KONDO Hirotomo

Department of Applied Chemistry, Faculty of Engineering, Sojo University
NISHIDA Masashi

Department of Applied Chemistry, Faculty of Engineering, Sojo University
YOSHIDA Isao

Department of Applied Chemistry, Faculty of Engineering, Sojo University

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抄録

Uranyl ion, UO₂²⁺, in an aqueous sodium hydrogen carbonate solution of pH 4 - 8 (source phase) was simultaneously and selectively transported into a dilute sulfuric acid solution (receiving phase) through a membrane (chloroform, bulk) containing a lipophilic ion-associate of methyltrioctylammonium ion and hydroxycalix[n]arene-p-sulfonate ion, 2_n (n = 6, 8), MTA⁺-2_n, as a metal carrier. The rate of transport increased in proportion to the concentrations of UO₂²⁺ in the source phase and carrier in the membrane and along with an increase in the temperature of the system. The rate was also increased along with an increase in the pH of the source phase. None of the other metal ions were transported, or obstructed the transport of UO₂²⁺, while the presence of large amounts of sodium hydrogencarbonate and sodium chloride in the source phase interfered with the transport by causing a delay in the start of transport.