Trace gold determination in cyanide process solutions-preconcentration using supported liquid membranes in a flow-injection manifold

✍ Scribed by M.J.C. Taylor; D.E. Barnes; G.D. Marshall

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 846 KB
• Volume: 265
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)85156-z

✦ Synopsis

Absbact

A method for the determmatlon of traces of gold m cyamde process solutions has been developed Preconcentratlon of the dlcyanoaurate(I) amon IS achieved by extraction mto a supported liquid membrane, formed by the m situ coatmg of a thm layer of organic phase onto a polymenc support This support IS packed into a numcolumn, which forms part of a flow mJectlon mamfold After the sample solution has flowed over the organic phase for a suitable per&, the entire organic phase IS washed off the c&unn unth an organic solvent and mtroduced mto the flame of a conventional atomic absorption spectrometer The method allows gold to be determmed m the range of 0 01 to 0 1 mg/l with a 2-7% relatnre standard devlatlon at the 004 mg/l level With an analysis time of 150 s per sample, a detection hnut of 0 005 mg/l was achieved with a samphng frequency of 24 h-'