Ag. Coedo et al., PRECONCENTRATION AND ANALYSIS OF GOLD FROM CYANIDE SOLUTIONS WITH THEUSE OF A MICROCOLUMN PACKED WITH THE PHOSPHINE-OXIDE CYANEX-921, Talanta, 43(3), 1996, pp. 313-318
The phosphine oxide Cyanex 921 (tri-n-octylphosphine oxide) was found
to be a very efficient extractant for gold from aurocyanide aqueous so
lutions. A system comprising a microcolumn packed with this new reagen
t was developed for the separation and enrichment of gold. Because of
the high selectivity of the developed system it is possible to analyze
gold in the presence of an excess of other metals and/or in high ioni
c strength solutions.