The chromatographic behaviour of a commercially available ion-exchange stationary phase (the Dionex IonPac CS12A column) is described for a wide range of transition and heavy metal ions with nitric acid eluents containing chloride and nitrate potassium salts. The separation selectivity was found to arise from simultaneous ion-exchange interactions and chelation with the attached carboxylic and phosphonic acid groups. These interactions were investigated by altering the ionic strength and pH of the eluent and also the column temperature. Strong affinity of the stationary phase towards heavy metal ions, in particular bismuth and the uranyl ion was observed at low pH under chelating ion-exchange conditions, with high efficiency separations of other ions including cadmium and lead being possible with short analysis times (∼5-15 min). Examples are given of separations obtained using 4-(2-pyridylazo)resorcinol or Arsenazo III as the post-column chromogenic reagents, demonstrating the potential versatility and utility of this stationary phase for heavy metal ion analysis. © 2003 Elsevier Science B.V. All rights reserved.

Item Type:	Refereed Article
Research Division:	Chemical Sciences
Research Group:	Analytical Chemistry
Research Field:	Separation Science
Objective Division:	Expanding Knowledge
Objective Group:	Expanding Knowledge
Objective Field:	Expanding Knowledge in the Chemical Sciences
Author:	Shaw, M (Dr Matt Shaw)
Author:	Nesterenko, PN (Professor Pavel Nesterenko)
Author:	Dicinoski, GW (Associate Professor Gregory Dicinoski)
Author:	Haddad, PR (Professor Paul Haddad)
ID Code:	27512
Year Published:	2003
Web of Science® Times Cited:	29
Deposited By:	Chemistry
Deposited On:	2003-08-01
Last Modified:	2011-10-24
Downloads:	0