Fast voltammetry of metals at carbon-fiber microelectrodes: rapid determination of solution formation constants
| Autor: | Stephen L. Morgan, Shawn P. McElmurry, Pavithra Pathirathna, Thushani Siriwardhane, Parastoo Hashemi |
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| Rok vydání: | 2016 |
| Předmět: |
Aqueous solution
Chemistry Metal ions in aqueous solution 010401 analytical chemistry Analytical chemistry Fast-scan cyclic voltammetry 010402 general chemistry 01 natural sciences Biochemistry 0104 chemical sciences Analytical Chemistry Microelectrode Stability constants of complexes Genetic algorithm Electrochemistry Environmental Chemistry Voltammetry Spectroscopy Equilibrium constant |
| Zdroj: | The Analyst. 141(21) |
| ISSN: | 1364-5528 |
| Popis: | Metal speciation controls the behavior of aqueous metal ions. Fundamental thermodynamic parameters, such as the formation constant (Kf) of metal–ligand equilibria, provide useful speciation information. Although this information can be determined by spectroscopic techniques with high accuracy, it comes at the expense of time and cost. In this work, we studied Cu2+ complexation with different ligands using an ultra-fast method, fast scan cyclic voltammetry (FSCV) at carbon-fiber microelectrodes (CFMs). We observed a correlation between the FSCV response and the previously reported Cu2+–ligand equilibrium constants. This relationship allowed us to model a predictive relationship between Kf and 16 model ligands. We hence present an essential proof of principle study that highlights FSCV's capability to prove speciation information in real time. |
| Databáze: | OpenAIRE |
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