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Developing a Vacuum Electrospray Source To Implement Efficient Atmospheric Sampling for Miniature Ion Trap Mass

Quan Yu1, Qian Zhang1, Xinqiong Lu1

  • 1Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University , Shenzhen 518055, China.

Analytical Chemistry
|November 2, 2017
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Summary

A new simplified vacuum electrospray ionization (VESI) source enhances miniature mass spectrometer atmospheric analysis. This system efficiently analyzes liquid and gas samples, achieving low detection limits for compounds like arginine.

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Atmospheric Science

Background:

  • Miniature mass spectrometer performance relies heavily on sampling system design.
  • Efficient atmospheric sampling is crucial for real-time analysis.

Purpose of the Study:

  • To develop a simplified vacuum electrospray ionization (VESI) source for miniature mass spectrometers.
  • To enhance atmospheric analysis capabilities of miniature rectilinear ion trap (RIT) mass spectrometers.

Main Methods:

  • Developed a VESI source combining discontinuous atmospheric pressure interface, direct capillary sampling, and pneumatic-assisted electrospray.
  • Utilized pulsed air to facilitate electrospray ionization in a vacuum chamber.
  • Coupled the VESI source with a miniature rectilinear ion trap (RIT) mass spectrometer.

Main Results:

  • Achieved efficient ESI analysis of liquid samples with a limit of detection of 8 ppb for arginine.
  • Demonstrated extractive electrospray ionization for organic compounds in gaseous samples.
  • Validated the VESI-RIT instrument for qualitative and quantitative analysis.

Conclusions:

  • The developed VESI source serves as an effective atmospheric sampling interface for miniature RIT mass spectrometers.
  • The VESI-RIT system enables versatile analysis of both liquid and gaseous samples.
  • This methodology broadens the application of VESI for rapid, online atmospheric monitoring.