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Separation of thiosulfate and the polythionates in gold thiosulfate leach solutions by capillary electrophoresis


O'Reilly, JW and Dicinoski, GW and Miura, Y and Haddad, PR, Separation of thiosulfate and the polythionates in gold thiosulfate leach solutions by capillary electrophoresis, Electrophoresis, 24, (12-13) pp. 2228-2234. ISSN 0173-0835 (2003) [Refereed Article]

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DOI: doi:10.1002/elps.200305458


A technique for the separation of thiosulfate (S2O32-), polythionates (SxO62-, x = 3 to 5) and the gold(I) thiosulfate complex (Au(S2O3)23-) using capillary electrophoresis with simultaneous UV detection at 195 and 214 nm is presented. The five species were separated in under 3 min with a total analysis time of 8 min, using an electrolyte containing 25 mM 2,2-bis(hydroxymethyl)-2,2',2''-nitrilotriethanol (bis-tris) adjusted to pH 6.0 with sulfuric acid and an applied voltage of -30 kV. While the gold(I) thiosulfate complex could be separated from the other analytes of interest under these conditions, the quantification of this complex was not possible due to inconsistent peak areas and peak splitting effects induced by the sulfur-oxygen species in the leach matrix. Detection limits calculated for 3s pressure injection at 50 mbar ranged between 0.5-2 M. The method was linear over the ranges 40-8000, 10-2000, 10-2000, and 5-2000 M for thiosulfate, trithionate, tetrathionate, and pentathionate, respectively. The technique was applied successfully to leach liquors containing 0.5 M ammonium thiosulfate, 2 M ammonia, 0.05 M copper sulfate and 20% w/v gold ore, diluted 1:100 prior to analysis.

Item Details

Item Type:Refereed Article
Keywords:Capillary electrophoresis Gold leaching Gold(I) thiosulfate complex Polythionates Thiosulfate
Research Division:Chemical Sciences
Research Group:Analytical chemistry
Research Field:Separation science
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:O'Reilly, JW (Dr John O'Reilly)
UTAS Author:Dicinoski, GW (Associate Professor Gregory Dicinoski)
UTAS Author:Miura, Y (Professor Yasuyuki Miura)
UTAS Author:Haddad, PR (Professor Paul Haddad)
ID Code:27497
Year Published:2003
Web of Science® Times Cited:9
Deposited By:Chemistry
Deposited On:2003-08-01
Last Modified:2010-02-05

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