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Noncontact Detection of Absorbed Dinitrotoluene Using Laser Electrospray Mass Spectrometry
Ning Ding1,2, Robert J Levis1,2
1Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.
This study demonstrates noncontact detection of 2,4-dinitrotoluene (DNT) using laser electrospray mass spectrometry (LEMS). Optimal laser energy and sampling methods were identified, achieving a 15 ng limit of detection for explosive detection.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Materials Science
Background:
- 2,4-dinitrotoluene (DNT) is a key explosive signature molecule.
- Sensitive and noncontact detection methods are crucial for security applications.
Purpose of the Study:
- To investigate noncontact detection of DNT using laser electrospray mass spectrometry (LEMS).
- To optimize LEMS parameters for enhanced DNT detection sensitivity and efficiency.
Main Methods:
- Utilized laser electrospray mass spectrometry (LEMS) for noncontact DNT detection.
- Varied laser vaporization energy, spot area, power density, and sampling tube positions.
- Developed a model correlating LEMS signal intensity with laser parameters.
Main Results:
- Optimal laser pulse energy differed for metal (0.4 mJ) and dielectric (1.2 mJ) substrates.
- LEMS signal intensity is influenced by laser spot area and power density.
- Achieved a limit of detection (LoD) of 15 ng for DNT using a remote sampling system.
Conclusions:
- LEMS is effective for noncontact DNT detection across various substrates.
- Optimization of laser parameters and sampling significantly improves detection efficiency.
- The developed method offers a sensitive approach for explosive trace detection.
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