Professor Spas D. Kolev (CV, website)
Title of Presentation:
Online Separation and Preconcentration of Au(III) in Bead Injection Analysis Using Micro Core-shell Polymer Inclusion Beads
- Zhang, R. W. Cattrall, S. D. Kolev*
School of Chemistry, The University of Melbourne, Melbourne, Parkville, 3010, Australia
*Email: s.kolev@unimelb.edu.au
Graphical Abstract
Abstract: Micro core-shell polymer inclusion beads (mCSPIBs), composed of poly(vinyl chloride) (PVC) as the base polymer, Aliquat 336 (a mixture of quaternary alkylammonium chlorides) as the extractant/carrier and 1-tetradecanol as a plasticizer, were fabricated by a novel microfluidic technique and used for improving the selectivity and sensitivity of Au(III) determination in a bead injection analysis (BIA) system. This determination was based on the catalytic effect of Au(I) on the reduction of phosphomolybdic acid by thiourea.
The analytical procedure involved first loading the separation column of the SIA system with mPIBs where Au(III) was separated from the sample matrix as a result of its extraction in the form of [AuCl4]- by Aliquat 336 into the mPIBs. This was followed by stripping the extracted Au(III) from the mPIBs into a receiving solution of thiourea where Au(III) was reduced to Au(I). The receiving solution was then mixed with a solution of phosphomolybdic acid which was reduced by thiourea to phosphomolybdenum blue and the latter was detected spectrophotometrically.
The SIA method was optimized and successfully applied to the determination of Au in aqua regia digests of electronic scrap. The results were in good agreement with those obtained by inductively coupled plasma-optical emission spectrometry.
