Detection of halogenated organics by their inhibitory action in a catalytic reaction between dimethyl acetylenedicarboxylate and 2-methyl-4-nitroaniline

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• 作者：Isaac Afreh ; Evan K. Wujcik ; Nathaniel Blasdel…
• 关键词：trihalomethanes ; drinking water ; Fujiwara reaction ; electrochemical detection
• 刊名：Journal of Analytical Chemistry
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：70
• 期：7
• 页码：825-830
• 全文大小：230 KB
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• 作者单位：Isaac Afreh (1)
  Evan K. Wujcik (1)
  Nathaniel Blasdel (1)
  Benjamin Sauer (1)
  Susan Kaya (1)
  Stephen Duirk (2)
  Chelsea N. Monty (1)
  
  1. Monty Research Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH, 44325-3906, USA
  2. Duirk Research Laboratory, Department of Civil Engineering, The University of Akron, Akron, OH, 44325, USA
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3199

文摘

The purpose of this paper is to report on the detection of toxic halogenated organic compounds in water using their inhibitory action on a pyridine-catalyzed reaction between dimethyl acetylenedicarboxylate (DMAD) and 2-methyl-4-nitroaniline (MNA). Previous work has shown that similar techniques can successfully lower the detection limit of sulfides and arsines in water samples, compared to their standard photometric detection methods. This paper highlights the optimization, selectivity, and sensitivity studies of the proposed sensing scheme. Optimization shows that the pyridine-catalyzed reaction is more favorable at 4 mM DMAD and 8 mM MNA. It was also determined that the inhibitory effect of halogenated organic compounds is more pronounced when carried out at 60°C. Using optimized reaction conditions, the limit of quantification for the four regulated trihalomethanes (THMs) was approximately 80 ppm. In addition, the sensing method is selective to THMs and a few other halogenated organics. These promising results demonstrate the further success of this technique for sensitive, selective detection, and future work will be carried out to incorporate the technique in sensing applications for THMs in drinking water.