임동영 (서강대학교)

오한빈 (서강대학교)

임동영 (서강대학교)

하승호 (서강대학교)

오한빈 (서강대학교)

To enable the on-site detection of predicted contaminants using a tube furnace and residual gas analyzer (RGA), we developed a portable mass spectrometer optimized for field deployment. This system combines a rectangular ion trap (RIT) configuration with discontinuous atmospheric pressure interface (DAPI) technology, enabling stable vacuum operation with a low-power pump and ensuring portability. The instrument's performance was evaluated for both qualitative and quantitative applications. The RIT successfully analyzed five different mixtures with varying mass (m/z) values. Using caffeine, robust linearity was demonstrated across the entire analytical range (R² = 0.9) for quantitative analysis. For field applications, paper spray ionization (PSI) was incorporated as a ambient method. After depositing a 10 μL aliquot of a 1 mM caffeine solution onto filter paper, 4.5 kV was applied, enabling qualitative detection of caffeine without sample preparation. Mixtures with four different m/z values were also qualitatively analyzed. Future research will focus on combining spray ionization with thin-layer chromatography (TLC) to enhance selective detection of trace analytes against a complex background matrix. Consequently, the developed miniature TLC-MS platform is expected to provide a powerful solution for rapid on-site analysis in chemical emergency situations.

This work was supported by grants from the Korea Environment Industry& Technology Institute (KEITI) through “Advanced Tech-nology Development Project for Predicting and Preventing Chemical Accident” program funded by the Korea Ministry ofEnvironment (MOE) (RS-2023-00219144).

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