Journal article

Evaluation of on-line preconcentration and flow-injection amperometry for phosphate determination in fresh and marine waters

Y Udnan, ID McKelvie, MR Grace, J Jakmunee, K Grudpan

Talanta | ELSEVIER SCIENCE BV | Published : 2005

Abstract

Dissolved reactive phosphorus (DRP) was determined as orthophosphate (PO(4)-P) in fresh and saline water samples by flow-injection (FI) amperometry, without and with in-valve column preconcentration. Detection is based on reduction of the product formed from the reaction of DRP with acidic molybdate at a glassy carbon working electrode (GCE) at 220 mV versus the Ag/AgCl reference electrode. A 0.1M potassium chloride solution was used as both supporting electrolyte and eluent in the preconcentration system. For the FI configuration without preconcentration, a detection limit of 3.4 microg Pl(-1) and sample throughput of 70 samples h(-1) were achieved. The relative standard deviations for 50 a..

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University of Melbourne Researchers