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

D. Giovanelli, M.C. Buzzeo, N.S. Lawrence, Christopher Hardacre, Kenneth Seddon, R.G. Compton

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

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. (C) 2003 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)904-911
Number of pages8
JournalTalanta
Volume62 (5)
Issue number5
DOIs
Publication statusPublished - 19 Apr 2004

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

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