Analytical Sciences


Abstract − Analytical Sciences, 17(4), 491 (2001).

Selective Transport of Silver Ion through a Supported Liquid Membrane Using Hexathia-18-Crown-6 as Carrier
Mojtaba SHAMSIPUR,*  Gholamhasan AZIMI,* Mohammad Hossein MASHHADIZADEH,* and Sayed Siavash MADAENI**
*Department of Chemistry, Razi University, Kermanshah, Iran
**Department of Chemical Engineering, Razi University, Kermanshah, Iran
A facile supported liquid membrane (SLM) system for the selective and efficient transport of silver ion is introduced. The SLM used is a thin porous polyvinyldifluoride membrane impregnated with hexathia-18-crown-6 (HT18C6) dissolved in nitrophenyloctyl ether. HT18C6 acts as a specific carrier for the uphill transport of Ag + ion as its picrate ion paired complex through the SLM. In the presence of thiosulfate ion as a suitable stripping agent in the strip solution, transport of silver occurs almost quantitatively after 4 h. The selectivity and efficiency of silver transport from aqueous solutions containing other Mn+ cations such as Mg2+, Ca2+, Co2+, Ni2+, Cu2+, Zn2+, Pb2+, Cd2+, Hg2+, Fe3+ and Cr3+ ions were investigated.