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Separation of polythionates and the gold thiosulfate complex in gold thiosulfate leach solutions by ion-interaction chromatography


O'Reilly, JW and Shaw, MJ and Dicinoski, GW and Grosse, AC and Miura, Y and Haddad, PR, Separation of polythionates and the gold thiosulfate complex in gold thiosulfate leach solutions by ion-interaction chromatography, The Analyst, 127, (7) pp. 906-911. ISSN 0003-2654 (2002) [Refereed Article]

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Copyright © 2002 Royal Society of Chemistry

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DOI: doi:10.1039/b204118a


A method for the separation of the polythionates (SxO62–, x= 3–5) in gold thiosulfate leach solutions using ion-interaction chromatography with conductivity and ultraviolet (UV) detection is described. Polythionates were eluted within 18 min using an eluent comprising an acetonitrile step gradient at 0.0 min from 15% v/v to 28% v/v, 3 mM TBAOH, and 2.5 mM sodium carbonate, operated using a Dionex NS1-5 ΅ column with guard. The developed method was capable of separating the gold thiosulfate complex ion in standard solutions, but quantification of this species in realistic leach solutions proved impractical due to a self-elution effect that caused the gold peak to be eluted as a broad band. Detection limits for polythionates using a 10 ΅L injection volume ranged between 1–6 mg L–1 (5–23 ΅M) for conductivity and 0.8–13 mg L–1 (4–68 ΅M) for UV detection, based on a signal-to-noise ratio of 2. Calibration was linear over the ranges 5–2000, 10-2000 and 25–2500 mg L–1 for 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 % m/v gold ore.

Item Details

Item Type:Refereed Article
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:Grosse, AC (Mr Andrew Grosse)
UTAS Author:Miura, Y (Professor Yasuyuki Miura)
UTAS Author:Haddad, PR (Professor Paul Haddad)
ID Code:56453
Year Published:2002
Web of Science® Times Cited:9
Deposited By:Austn Centre for Research in Separation Science
Deposited On:2009-05-04
Last Modified:2009-07-28

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