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Determination of ammonia based on the electro-oxidation of hydroquinone in dimethylformamide or in the room temperature ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide |
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| Authors: | Giovanelli Debora Buzzeo Marisa C Lawrence Nathan S Hardacre Christopher Seddon Kenneth R Compton Richard G |
| Institution: | a Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK b School of Chemistry, The Queen’s University of Belfast, Belfast BT9 5AG, UK |
| Abstract: | The results detail a novel methodology for the electrochemical determination of ammonia based on its interaction with hydroquinone in DMF. It has been shown that ammonia reversibly removes protons from the hydroquinone molecules, thus facilitating the oxidative process with the emergence of a new wave at less positive potentials. The analytical utility of the proposed methodology has been examined with a linear range from 10 to 95 ppm and corresponding limit-of-detection of 4.2 ppm achievable. Finally, the response of hydroquinone in the presence of ammonia has been examined in the room temperature ionic liquid 1-ethyl-3-methylimidazolium bis(trifluormethylsulfonyl)imide, EMIM]N(Tf)2]. Analogous voltammetric waveshapes to that observed in DMF were obtained, thereby confirming the viability of the method in either DMF or EMIM]N(Tf)2] as solvent. |
| Keywords: | Ammonia Hydroquinone Oxidation Room temperature ionic liquid DMF Voltammetry |
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