Transport of Gold Ion from a Hydrochloric Acid Solution Across a Supported Liquid Membrane Containing Sulfide Podand
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The transport of gold ions (5×10<sup>-5</sup>M) from a diluted hydrochloric acid solution to a stripping solution across a supported liquid membrane (SLM) containing 0.1M solution of polydentate neutral sulfide podand 1, 12-di-2-thienyl-2, 5, 8, 11- tetrathiadodecane (TTD) in m-chlorotoluene was studied. The rate of transport of gold ions increased in the sequence of the stripping solutions, NaBr_??_NH<sub>3</sub>, thiourea<NaSCN<NaI<thiosulfate. Among three microporous polymers used, the rate with Celgard 2500 membrane is ca. 23% higher than for Celgard 4510 or 2502. The present result shows that the selectivity for gold ion is good against copper, zinc and iron ions present in 200:1 excess. The gold flux (J) increases almost linearly with an increase in the initial gold concentration over the range 10<sup>-5</sup>-10<sup>-4</sup>M; for 5×10<sup>-5</sup>M Au it is equal to 10.3×10<sup>-8</sup>mol cm<sup>-2</sup> h<sup>-1</sup>.
- Analytical Sciences
Analytical Sciences 11(2), 277-280, 1995-04-10
The Japan Society for Analytical Chemistry