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Field-deployable sniffer for 2,4-dinitrotoluene detection.

K J Albert1, M L Myrick, S B Brown

  • 1Department of Chemistry, Tufts University, Medford, Massachusetts 02155, USA.

Environmental Science & Technology
|August 17, 2001
PubMed
Summary
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A new field instrument uses artificial nose technology to detect low levels of 2,4-dinitrotoluene (2,4-DNT) vapors. This system successfully identified 120 ppb 2,4-DNT in humidified samples, aiding in land mine detection.

Area of Science:

  • Analytical Chemistry
  • Sensor Technology
  • Environmental Monitoring

Background:

  • 2,4-dinitrotoluene (2,4-DNT) is a key indicator compound found above buried 2,4,6-trinitrotoluene (TNT) land mines.
  • Accurate and rapid detection of 2,4-DNT is crucial for land mine remediation and safety.
  • Existing detection methods may lack the sensitivity, portability, or specificity required for field deployment.

Purpose of the Study:

  • To develop and validate a field-deployable instrument for detecting low concentrations of 2,4-DNT vapors.
  • To leverage artificial nose technology for sensitive and selective chemical sensing.
  • To demonstrate the instrument's capability in realistic environmental sample matrices.

Main Methods:

  • Utilized an artificial nose system based on an array of sensory materials at the tips of an optical fiber bundle.

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  • Employed both semiselective and nonspecific, cross-reactive sensors to generate unique fluorescence response patterns.
  • Developed computational methods for training the instrument to discriminate target analytes from background noise.
  • Applied the system to detect 2,4-DNT in spiked soil, aqueous, and ground samples.

    • Main Results:

    • The developed instrument successfully detected 2,4-DNT vapors at low levels.
    • Demonstrated the ability to identify 120 parts per billion (ppb) of 2,4-DNT in blind, humidified samples during field tests.
    • The system showed differential responses from the sensor array, enabling unique analyte discrimination.

    Conclusions:

    • The field-deployable instrument is effective for detecting 2,4-DNT vapors with high sensitivity.
    • Artificial nose technology provides a viable platform for environmental sensing applications, particularly for explosives detection.
    • The system's performance in supervised field tests indicates its potential for real-world land mine detection scenarios.