2,4-Toluene diisocyanate detection in liquid and gas environments through electrochemical oxidation in an ionic liquid

The Analyst
Lu LinXiangqun Zeng

Abstract

The electrochemical oxidation of 2,4-toluene diisocyanate (2,4-TDI) in an ionic liquid (IL) has been systematically characterized to determine plausible electrochemical and chemical reaction mechanisms and to define the optimal detection methods for such a highly significant analyte. It has been found that the use of an IL as the electrolyte allows the oxidation of 2,4-TDI to occur at a less positive anodic potential with no side reactions as compared to traditional acetonitrile based electrolytes. UV-Vis, FT-IR, cyclic voltammetry and Electrochemical Impedance Spectroscopy (EIS) studies have revealed the unique mechanisms of dimerization of 2,4-TDI at the electrode interface by self-addition reactions, which can be utilized to improve the selectivity of detection. The study of 2,4-TDI redox chemistry further facilitates the development of a robust amperometric sensing methodology by selecting a hydrophobic IL ([C4mpy][NTf2]) and by restricting the potential window to only include the oxidation process. Thus, this innovative electrochemical sensor is capable of avoiding the two most ubiquitous interferents in ambient conditions (i.e. humidity and oxygen), thereby enhancing the sensor performance and reliability for real world a...Continue Reading

References

Oct 29, 2002·Journal of Environmental Monitoring : JEM·Maj-Len Henriks-EckermanKerstin Engström
May 30, 2006·Journal of Hazardous Materials·Chuen-Jinn TsaiC G Deshpande
Feb 11, 2010·Physical Chemistry Chemical Physics : PCCP·Hongtao LiuJinghong Li
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Feb 28, 2013·Journal of Occupational and Environmental Hygiene·Joshua W SchaefferWilliam J Brazile
Sep 10, 2013·Journal of Immunological Methods·Angela R LemonsBrett J Green

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