Miniaturized mass-selective detector with atmospheric pressure chemical ionization

Area of Science:

• Analytical Chemistry
• Instrument Development
• Mass Spectrometry

Background:

• Miniaturization of analytical instruments is crucial for field applications.
• Atmospheric pressure chemical ionization (APCI) offers advantages for analyzing various compounds.
• High sensitivity detection is required for trace-level analysis.

Purpose of the Study:

• To describe a miniaturized mass-spectrometric detector with APCI.
• To evaluate its performance, including detection limits and fragmentation capabilities.
• To assess its suitability for specific applications like phosphor-containing substance detection.

Main Methods:

• Development of a compact mass spectrometer utilizing a monopole analyzer.
• Integration of APCI, channeltron detector, and associated electronics into a small form factor.
• Testing of the instrument's efficiency and detection limits under reduced vacuum conditions.
• Implementation of a "strong" fragmentation mode for targeted analysis.

Main Results:

• A miniaturized mass-spectrometric detector (185 x 100 x 70 mm, ~20 kg) was successfully developed.
• The instrument maintains analyzer efficiency up to 0.13 Pa.
• Parts-per-trillion (ppt) level detection limits were achieved despite a low-power vacuum system.
• The "strong" fragmentation mode proved effective for specific detection of phosphor-containing substances.

Conclusions:

• The described miniaturized APCI mass-spectrometric detector offers high sensitivity and specificity in a compact package.
• It is suitable for trace-level detection of target analytes, including phosphor-containing compounds.
• The instrument's design demonstrates the feasibility of high-performance mass spectrometry in a portable format.