University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Cyanide

Classification: Industrial -> process liquor -> cyanide

Citations 1

"Trace Gold Determination In Cyanide Process Solutions - Preconcentration Using Supported Liquid Membranes In A Flow Injection Manifold"
Anal. Chim. Acta 1992 Volume 265, Issue 1 Pages 71-79
M. J. C. Taylor*, D. E. Barnes and G. D. Marshall

Abstract: The Au(CN)2- anion was extracted into a supported liquid membrane, formed by the in situ coating of a thin layer of organic phase onto a polymeric support. Of the systems tested, the most selective was a 1% solution of tridecylamine in a diluent consisting of 50% TBP in heptane, supported on Polysorb MP-1. This material was packed into a mini-column which formed part of a flow injection manifold. Sample (10 ml) was adjusted to pH 8 with 0.5 M triethanolamine - Titriplex III buffer. After the solution had flowed over the liquid membrane for a suitable time, the entire organic phase was washed off the column with methanol and introduced into the flame of an atomic absorption spectrometer. At a load time of 120 s and a flow-rate of 5 mL min-1, a 53-fold pre-concentration. of Au was achieved and the throughput was 24 samples h-1. The method allowed the determination of Au in the range 0.01 to 0.1 mg l-1, and the detection limit was 5 µg l-1. The coefficient of variation was 2.7% at the 40 µg L-1 level. A 20-fold excess of Ag could be tolerated. A method for the determination of traces of gold in cyanide process solutions has been developed. Preconcentration. of the dicyanoaurate(I) anion is achieved by extraction into a supported liquid membrane, formed by the in situ coating of a thin layer of organic phase onto a polymeric support. This support is packed into a minicolumn, which forms part of a flow injection manifold. After the sample solution has flowed over the organic phase for a suitable period, the entire organic phase is washed off the column with an organic solvent and introduced into the flame of a conventional atomic absorption spectrometer. The method allows gold to be determined in the range of 0.01 to 0.1 mg/L with a 2-7% relative standard deviation of the 0.04 mg/L level. With an anal. time of 150 s per sample, a detection limit of 0.005 mg/L was achieved with a sampling frequency of 24 h-1.
Gold Spectrophotometry Sample preparation Supported liquid membrane Buffer Organic phase detection Extraction Preconcentration