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Comparison of adsorptive stripping voltammetry (AdSV) and capillary zone electrophoresis (CZE) for the trace determination of selected metal ions, chelated with 2-(5'-bromo-2'-pyridylazo)-5-(diethylamino)phenol (PADAP)

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Oxspring, DA, Maxwell, TJ and Smyth, Franklin (1995) Comparison of adsorptive stripping voltammetry (AdSV) and capillary zone electrophoresis (CZE) for the trace determination of selected metal ions, chelated with 2-(5'-bromo-2'-pyridylazo)-5-(diethylamino)phenol (PADAP). ANALYTICAL PROCEEDINGS, 32 (12). pp. 489-491. [Journal article]

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Abstract

Adsorptive stripping voltammetry (AdSV) is compared with capillary zone electrophoresis (CZE) for the detection and determination of trace concentrations of metal ions such as Co2+, Cu2+, Cd2+, Zn2+ and Pb2+ as their 2-(5'-bromo-2'-pyridylazo)-5-(diethylamino)phenol (PADAP) chelates, Limits of detection for Cd2+, Zn2+ Pb2+ and Co2+ were 9, 3, 6 and 0.3 ppb, respectively, using the AdSV method, with Cu2+ not giving a reproducible cathodic signal as the Cu2+-PADAP chelate, The technique would appear to be selective towards the determination of Co2+ in a mixture since its adsorbable chelate with PADAP was reduced at -670 mV, giving a voltammetric response not affected by the presence of equimolar concentrations (1 x 10(-7) mol dm(-3)) of Cd2+, Pb2+ and Zn2+, CZE using PADAP at a concentration of 10(-4) mol dm(-3) in the run buffer had higher limits of detection than AdSV but possessed greater selectivity in that, at pH 6, Co2+, Cd2+, Zn2+ and Cu2+ could be resolved as their chelates with PADAP, the Pb2+ chelate not giving a signal at all. Other selectivities could be observed at higher pH values. The CZE technique was also found particularly responsive to the Co3+-PADAP chelate in the presence of other trace metal ions. It is therefore being investigated as a trace analytical method for the determination of Co2+ in, selected complex matrices.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Biomedical Sciences
Research Institutes and Groups:Biomedical Sciences Research Institute
Biomedical Sciences Research Institute > Pharmaceutical Science and Practice
ID Code:3725
Deposited By:Prof W.Franklin Smyth
Deposited On:12 Jan 2010 09:40
Last Modified:04 May 2012 09:19

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