SLIM Ion Mobility-Based Analysis of Low Molecular Weight Explosives.

Area of Science:

• Analytical Chemistry
• Forensic Science
• Spectrometry

Background:

• Explosive compound detection is crucial for security and forensics.
• Isomeric compounds present challenges in sample analysis.
• Ion mobility spectrometry (IMS) and high-resolution IMS (HRIM-MS) are established techniques for ion separation and identification.

Purpose of the Study:

• To evaluate a novel Structures for Lossless Ion Manipulations (SLIM) ion mobility platform with a rounded turn design.
• To enhance the separation and identification of isomeric explosive compounds.
• To improve ion transmission efficiency for low-mass analytes.

Main Methods:

• Utilized a novel SLIM ion mobility platform with a rounded turn design.
• Employed negative mode atmospheric pressure chemical ionization (APCI).
• Integrated SLIM with high-resolution ion mobility-mass spectrometry (HRIM-MS).

Main Results:

• Demonstrated improved ion transmission efficiency for low-mass explosive compounds compared to traditional 90° turn systems.
• Successfully separated isomeric nitroaromatic compounds, including dinitrotoluene (DNT) isomers.
• Showcased the capability of SLIM HRIM-MS to combine mobility, accurate mass, and isotopic patterns for identification.

Conclusions:

• The rounded turn SLIM design significantly enhances ion transmission for low-mass analytes.
• SLIM HRIM-MS offers improved separation and identification of isomeric explosives.
• This technology advances security screening and forensic analysis capabilities.