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Integrating Paper Chromatography with Electrochemical Detection for the Trace Analysis of TNT in Soil
Patrick Ryan1, Daniel Zabetakis2, David A Stenger3
1Science and Engineering Apprenticeship Program, Naval Research Laboratory, Washington, DC 20375, USA. patrick_ryan_@outlook.com.
Abstract:
We report on the development of an electrochemical probe for the trace analysis of 2,4,6-trinitrotoluene (TNT) in soil samples. The probe is a combination of graphite electrodes, filter paper, with ethylene glycol and choline chloride as the solvent/electrolyte. Square wave chromatovoltammograms show the probes have a sensitivity for TNT of 0.75 nA/ng and a limit of detection of 100 ng. In addition, by taking advantage of the inherent paper chromatography step, TNT can be separated in both time and cathodic peak potential from 4-amino-dinitrotolene co-spotted on the probe or in soil samples with the presence of methyl parathion as a possible interferent.
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