Sonochemical Stripping Voltammetry
| Autor: | Nanette A. Madigan, Louis A. Coury, Carolynne R. S. Hagan, John M. Fortune, Tammy J. Murphy |
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| Rok vydání: | 1995 |
| Předmět: | |
| Zdroj: | Analytical Chemistry. 67:2781-2786 |
| ISSN: | 1520-6882 0003-2700 |
| DOI: | 10.1021/ac00113a010 |
| Popis: | A new form of stripping analysis is described which exploits the extreme conditions produced during sonication. Sonochemical stripping voltammetry differs from other forms of stripping analysis in that the preconcentration of the analyte is sonochemical rather than electrochemical. Zero-valent metal particles are melted onto the electrode surface after being accelerated by microjets formed due to acoustic cavitation. The electrode is then transferred to an electrolyte solution for voltammetric analysis via linear sweep or square wave voltammetry. This allows the deposition to occur in nonelectrolytic or complex matrices. Sonochemical deposition of copper onto gold electrodes is demonstrated both electrochemically and microscopically by scanning electron microscopy. Using square wave voltammetry, a linear relationship is demonstrated between extent of copper deposition from a Cu/DMSO slurry and sonication time up to 15 min. There is also a linear dependence of response on the amount of copper in the slurry. Selectivity based on the melting point of the metal in the slurry is shown, both electrochemically and with scanning electron microscopy, through sonication of slurries containing copper and tungsten powders. Finally, deposition of copper from lubricating oils mixed with organic diluents illustrates the utility of the technique for samples of practical importance. It also demonstrates that information concerning the viscosity behavior of non-Newtonian fluids under conditions of extreme temperature and shear rate is obtainable, despite dilution with an organic solvent. |
| Databáze: | OpenAIRE |
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