Effect of mercury(II) on metal complex labilities determined by direct-current anodic stripping voltammetry on a thin mercury film electrode |
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Authors: | H Kipton J Powell T Mark Florence |
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Institution: | Department of Chemistry, University of Canterbury, Private Bag; Christchurch New Zealand;CSIRO, Division of Fuel Technology, Private Mail Bag 7, Menai, NSW 2232 Australia |
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Abstract: | The labilities of copper, lead and cadmium complexes with fulvic acid, nitrilotriacetic acid and an iron-humic acid colloid were studied on a preplated thin mercury film electrode and with in-situ plating of mercury on a glassy carbon electrode. In the presence of mercury(II) the apparent labilities based on direct-current anodic stripping voltammetric peak-area measurements increased for each of the cadmium and lead species and for the copper iron-humic acid colloid species. In contrast, for the copper complexes with nitrilotriacetic acid and fulvic acid the lability was not measurably altered by mercury(II); it is inferred that they do not undergo rapid metal exchange with mercury(II). |
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