A rapid and efficient mass spectrometric method for the analysis of explosives

Area of Science:

• Analytical Chemistry
• Forensic Science

Background:

• High explosives detection is crucial for security and safety.
• Traditional detection methods face limitations in sensitivity and specificity.

Purpose of the Study:

• To investigate the efficacy of chlorine complexation with negative ion atmospheric pressure chemical ionization (APCI) for explosives detection.
• To enhance the sensitivity and reproducibility of explosives analysis.

Main Methods:

• High explosives (trinitrotoluene, nitroglycerine, pentaerythritol tetranitrate, hexahydro-1,3,5-trinitro-1,3,5-triazine) were analyzed using APCI.
• Chlorine complexation was employed to improve ionization efficiency.
• Sample introduction involved a heated-plate inlet with dichloromethane in air.
• Tandem mass spectrometry (MS/MS) with optimized ion trap parameters was utilized.

Main Results:

• Efficient ionization of explosives was achieved under negative ion APCI conditions.
• Chlorine complexation improved detection limits by several orders of magnitude.
• Dichloromethane addition minimized analyte decomposition and enhanced chloride adduct formation.
• Optimized MS/MS analysis yielded simple spectra, high reproducibility, and improved detection limits.

Conclusions:

• Chlorine complexation is a highly suitable method for enhancing explosives detection via APCI-MS/MS.
• The developed method offers improved sensitivity, reproducibility, and reduced decomposition for explosives analysis.
• This technique holds promise for more effective explosives screening and identification.