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Issue 18, 2016
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An aerodynamic assisted miniature mass spectrometer for enhanced volatile sample analysis

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Abstract

Previously, we have reported the development of a miniature mass spectrometer with a continuous atmospheric pressure interface (CAPI), and the use of it for non-volatile sample analysis, such as drugs, peptides and proteins. However due to the diffusion effects in the CAPI, especially stronger for light ions, the instrument shows low detection sensitivities for volatile samples when coupling with an atmosphere pressure chemical ionization (APCI) source (>ppmv). In this study, an in-vacuum plasma ionization source was designed and integrated into the system. By performing ionization in the first vacuum stage, ion transfer loss through the CAPI was minimized and tens of ppbv level detection sensitivities were achieved for volatile samples. Due to its improved sensitivity, chemical source tracing was demonstrated in an indoor environment as a simple proof-of-concept example. Furthermore, an aerodynamic sampling method was developed to facilitate directional sample transfer towards the miniature mass spectrometer in an open environment. By coupling this aerodynamic method with the miniature mass spectrometer, remote chemical source sensing could be achieved at a distance of more than two meters. This aerodynamic sampling method could also be applied to other mass spectrometry instruments for enhanced sample sampling in open environments.

Graphical abstract: An aerodynamic assisted miniature mass spectrometer for enhanced volatile sample analysis

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Supplementary files

Article information


Submitted
25 Apr 2016
Accepted
22 Jun 2016
First published
22 Jun 2016

Analyst, 2016,141, 5404-5411
Article type
Paper

An aerodynamic assisted miniature mass spectrometer for enhanced volatile sample analysis

Y. Zhai, T. Jiang, G. Huang, Y. Wei and W. Xu, Analyst, 2016, 141, 5404
DOI: 10.1039/C6AN00956E

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