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A study of the stripping voltammetric behavior of selected metal chelates and its application to automated analysis of river waters

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

Maxwell, TJ and Smyth, Franklin (1996) A study of the stripping voltammetric behavior of selected metal chelates and its application to automated analysis of river waters. ELECTROANALYSIS, 8 (8-9). pp. 795-802. [Journal article]

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Abstract

The ASV and AdSV behavior of Zn2+, Cd2+, Pb2+, Cu2+, Ni2+ and Sn4+ in the presence of selected complexing/chelating agents has been studied. The presence of 2,5-dimercapto-1,3,4-thiadiazole (I) lowers the limit of detection (LOD) for the ASV determination of Zn2+, Cd2+ and Pb2+ in 5 x 10(-3) mol dm(-3) LiCl supporting electrolyte with a deposition time of 120 s to 0.82, 0.17 and 0.34 ppb, respectively, due to participation of the adsorbed complexing agent in the overall process. Similarly, Cd2+ can be determined in the presence of benzimidazole sulfoxides (II) and (III) by ASV in Britton-Robinson (BR) buffer pH 9, with 120s deposition with lower LODs of 0.12 and 0.06 ppb, respectively. AdSV can also be used to determine Cd2+ with (II), (III) and ammonium pyrrolidine dithiocarbamate (IV) with LODs of 0.70, 0.64 and 0.20 ppb, respectively and with Zn2+ having an AdSV LOD of 1.09 ppb using adsorption of its chelate with (IV) at -900 mV for 60 s in a supporting electrolyte of 5 x 10(-3) mol dm(-3) LiCl. Participation of the adsorbed complexing agent in the ASV process is also observed for Sn4+ and Cu2+ in an oxalate/ammonium chloride/HCl buffer with lowered LODs of 0.51 ppb and 0.76 ppb in the presence of p-methylene blue (V). The chelating agent 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (VII) can be used to determine Cd2+, Zn2+ and Pb2+ using the AdSV technique down to LODs of 9.3, 2.7 and 6.3 ppb, respectively. Several of these methods have been combined in the development of an automated method for the determination of trace Zn, Cd, Pb and Cu in an artificial river water matrix. The accuracy and precision of this procedure is discussed. Determination of Ni, Sn and As by this automated method and in such a matrix proved to be inaccurate.

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:3713
Deposited By:Prof W.Franklin Smyth
Deposited On:12 Jan 2010 09:46
Last Modified:04 May 2012 09:19

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