Trace Detection of 2, 4, 6-Trinitrotoluene Using Electrochemical Gas Sensor

Abstract

In this paper, selective and sensitive detection of trace amounts of 2, 4, 6-trinitrotoluene is demonstrated. The screening system is based on a sampling/concentrator front end and electrochemical potentiometric gas sensors as the detector. Preferential hydrocarbon and nitrogen oxide(s) mixed potential sensors with integrated heaters were used to capture the signature of the explosive. Quantitative measurements based on hydrocarbon and nitrogen oxide sensor responses indicated that the detector sensitivity scaled proportionally with the mass of the explosives (down to 250 ng). The sensitivity was found to depend on the flow rate and sensor orientation. The sensitivity was found to increase with increasing flow rate. This detection technique has the potential to become an orthogonal technique to the existing explosive screening technologies for reducing the number of false positives/false negatives in a cost-effective manner.Index Terms-Explosives, TNT, mixed potential, and electrochemical sensor.

Flexible SERS-based substrates: challenges and opportunities toward an Army relevant universal sensing platform

“…Chemical sensors [67][68][69][70][71][72][73][74][75][76][77][78][79] and optical sensors remain a potential technology used for the detection of hazard materials for a host of reasons including that they are reproducible, and can be manufactured to be low cost, portable, and can be fabricated to be target specific. Generally, in a chemical sensor, some chemical undergoes a selective reaction once it comes into contact with a target explosive material.…”

A Portable Low-Power Acquisition System with a Urease Bioelectrochemical Sensor for Potentiometric Detection of Urea Concentrations

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