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Planar Differential Mobility Analyzer with a Resolving Power of 110
Mario Amo-González1, Sergio Pérez1
1SEADM , Parque Tecnológico de Boecillo 205 , Valladolid 47151 , Spain.
Analytical Chemistry
|May 8, 2018
Summary
Researchers improved planar differential mobility analyzers (DMAs) to achieve a resolving power of 110, nearing the theoretical limit. This advancement enhances the selectivity of DMAs for analyzing complex samples like olive oil.
Area of Science:
- Analytical Chemistry
- Physical Chemistry
- Instrumental Analysis
Background:
- Planar differential mobility analyzers (DMAs) have historically shown resolving powers (60-80) below theoretical limits in air or N2.
- The reasons for this performance gap in DMAs have remained unclear, limiting their application in detailed chemical analysis.
Purpose of the Study:
- To achieve near-theoretical resolving power in planar DMAs.
- To investigate the impact of improved flow laminarization on DMA performance.
- To assess the enhanced DMA's selectivity using a real-world sample.
Main Methods:
- Implemented an improved flow laminarizer in SEADM's P5 DMA.
- Operated the DMA at high gas velocities using a series of blowers.
- Combined the improved DMA with a mass spectrometer for sample analysis.
Main Results:
- Achieved a resolving power of 110, significantly exceeding previous planar DMA performance.
- Demonstrated that the improved laminarizer is effective even at high gas velocities.
- Successfully assessed the DMA-mass spectrometer system's selectivity on extra virgin olive oil.
Conclusions:
- Improved flow laminarization is key to reaching near-ideal resolving power in planar DMAs.
- The enhanced DMA offers superior selectivity for analyzing complex mixtures.
- This advancement holds promise for more detailed chemical characterization of real-world samples.
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