title: Trace gold determination by on-line preconcentration with flow injection atomic absorption spectrometry.
abstract: A reverse-phase extraction column method has been employed as an on-line preconcentration technique for trace gold analysis by flame atomic absorption spectrometry. Di(methylheptyl)methyl phosphonate (DMHMP) loaded onto a macroporous resin was used as the immobilized phase. A thiourea-HCl solution was found successful in eluting the gold. The experimental parameters were optimized by Simplex Optimization, with 17 tests needed to obtain optimal conditions. Sensitivities of 5.2 mug/l. and 2.3 mug/l., with sample frequencies of 45/hr and 48/hr, were obtained by using single and dual-columns respectively. The recoveries for mixed composition samples were 93-110%.
authors.affiliation: School of Chemical Technology, University of South Australia, The Levels, S.A. 5095, Australia.
authors.forename: P
authors.initials: P
authors.lastname: Di
authors.forename: D E
authors.initials: DE
authors.lastname: Davey