SELECTIVE UP-HILL TRANSPORT OF GOLD TO IODIDE STRIPPING SOLUTION THROUGH A SOLVENT MODIFIED LIQUID MEMBRANE CONTAINING A POLYSULFIDE PODANDAS CARRIER

Citation
E. Lachowicz et al., SELECTIVE UP-HILL TRANSPORT OF GOLD TO IODIDE STRIPPING SOLUTION THROUGH A SOLVENT MODIFIED LIQUID MEMBRANE CONTAINING A POLYSULFIDE PODANDAS CARRIER, Analytica chimica acta, 327(2), 1996, pp. 175-181
Citations number
24
Categorie Soggetti
Chemistry Analytical
Journal title
ISSN journal
00032670
Volume
327
Issue
2
Year of publication
1996
Pages
175 - 181
Database
ISI
SICI code
0003-2670(1996)327:2<175:SUTOGT>2.0.ZU;2-W
Abstract
The polydentate neutral sulphide podand 1,12-di-2-thienyl-2,5,8,11-tet rathiadodecane (TTD), C4H3S-(CH2-S-CH2)(4)-C4H3S, which Shows high aff inity towards ''soft metal ions'' has been used as a carrier for gold transport through a supported liquid membrane (SLM). Transport of gold (5x10(-5)M) from hydrochloric acid solution to the stripping solution was facilitated by TTD in m-chlorotoluene(MCT)/kerosene solution immo bilized in the pores of a polyvinylidene fluoride Millipore membrane. A study of the influence of different chemical and physical parameters on Au transport has been carried out. This includes the presence of k erosene in TTD-MCT solutions, the concentration of the carrier in the liquid membrane, the concentration of the stripping agent NaI (or NaSC N) and the stirring rate of both aqueous solutions. The highest value obtained for the permeability coefficient P was 0.34 cm min(-1), and f or the Au flux 1.5 x 10(-6) mol m(-2) s(-1). A high selectivity in the separation of Au from its bi-cation mixtures with an excess of Zn, Cu (II), Fe(III), or Cd was achieved.