title: On-line preconcentration and determination of trace metals using a flow injection system coupled to ion chromatography.
abstract: A flow injection (FI) method with on-line preconcentration using a mini-column loaded with 8-hydroxyquinoline immobilized on controlled pore glass (CPG-8HQ) is described for the determination of trace metals by ion chromatography (IC) with pyridine-2-6-dicarboxylic acid (PDCA) as the eluent. Copper, cadmium, lead, zinc, nickel and iron were determined at ppb level after post-column derivatization with 4-(2-pyridylazo)-resorcinol (PAR). The detection limits (3sigma) for the FI/IC system were 8.27, 0.89, 0.09, 0.06, 0.09 and 0.07 g l(-1) for Pb(2+), Cd(2+), Cu(2+) Ni(2+), Zn(2+) and Fe(3+), respectively, using 5 ml sample volume. The method was applied to the analysis of Malaysian natural waters.
authors.affiliation: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: M Radzi
authors.initials: MR
authors.lastname: Bin Abas
authors.forename: Ismat Ali
authors.initials: IA
authors.lastname: Takruni
authors.forename: Zanariah
authors.initials: Z
authors.lastname: Abdullah
authors.forename: Norhayati Mohd
authors.initials: NM
authors.lastname: Tahir