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Ion chromatographic analysis of cyanate in gold processing samples containing large concentrations of metallo-cyanide complexes
journal contribution
posted on 2023-05-16, 10:57 authored by Fagan, PA, Brett PaullBrett Paull, Paul HaddadPaul Haddad, Dunne, R, Kamar, HAn ion chromatographic (IC) method was developed for the determination of cyanate in gold cyanidation samples containing large concentrations of metallo-cyanide complexes. The analysis was performed on a Waters HC IC-Pak A anion-exchange column with an anthranilic acid eluent, with detection achieved using indirect UV at 355 nm. Two procedures were developed for removal of the metallo-cyanide complexes prior to the IC analysis. The first was a manual off-line method which used solid-phase extraction cartridges containing a strong anion-exchange resin to trap the complexes and to then enable determination of cyanate without interference. In the second approach, an automated on-line method was developed which used an anion-exchange guard column to trap the complexes and a column switching valve to allow backflushing of the cyanate from the guard column. This enabled the total analysis to be performed in a time of 10–14 min, depending on the sample composition. Finally, a comparison of results obtained by the standard Kjeldahl nitrogen method for cyanate and the IC method revealed an interference in the Kjeldahl method for samples containing large concentrations of Cu(I)-cyanide complexes.
History
Publication title
Journal of Chromatography AVolume
770Issue
1-2Pagination
175-184ISSN
0021-9673Department/School
School of Natural SciencesPublisher
ElsevierPlace of publication
The NetherlandsRights statement
The definitive version is available at http://www.sciencedirect.comRepository Status
- Restricted