Related Experiment Videos
Membrane introduction mass spectrometry: trends and applications
R C Johnson1, R G Cooks, T M Allen
1Chemistry Department, Purdue University, West Lafayette, Indiana 47907, USA.
Mass Spectrometry Reviews
|March 15, 2000
Summary
Recent advances in membrane introduction mass spectrometry (MIMS) enable online monitoring of chemical and biological processes. New membranes and techniques improve analysis of volatile and polar compounds in environmental samples and complex mixtures.
Area of Science:
- Analytical Chemistry
- Mass Spectrometry
- Separation Science
Background:
- Membrane introduction mass spectrometry (MIMS) is a direct sampling technique for online analysis.
- Critical variables influencing MIMS performance include membrane properties and analyte characteristics.
- MIMS finds applications in process monitoring, environmental analysis, and fundamental chemical studies.
Purpose of the Study:
- To review recent advancements in membrane introduction mass spectrometry (MIMS).
- To highlight critical variables affecting MIMS performance for online monitoring.
- To discuss novel membrane materials and experimental variations for enhanced analytical capabilities.
Main Methods:
- Review of recent literature on MIMS advancements.
- Focus on critical variables: membrane nature/dimensions, analyte vapor pressure, diffusivity, and solubility.
- Discussion of new semipermeable membranes (polymers, liquids, zeolites) and MIMS variations (CT-MIMS, trap-and-release, differential thermal release, reverse phase MIMS).
Main Results:
- New membranes allow monitoring of polar compounds, selective differentiation via affinity-binding, and isomer separation by size.
- High spatial resolution measurements and electrically driven sampling are presented.
- Analyte preconcentration techniques (CT-MIMS, trap-and-release) and differential thermal release methods enhance sensitivity and selectivity.
- Solutions for semivolatile compound analysis and complex mixture differentiation are discussed, including thermally assisted desorption, ultrathin membranes, derivatization, sample modulation, and temperature-programmed desorption.
Conclusions:
- Recent MIMS developments have expanded its applicability to challenging analytes and complex matrices.
- Novel membrane materials and experimental configurations address limitations in analyzing semivolatile compounds and mixtures.
- MIMS continues to evolve as a powerful direct sampling technique for diverse analytical problems.