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Issue 9, 2003
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Solid phase micro-extraction in a miniature ion trap mass spectrometer

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Fiber introduction mass spectrometry (FIMS), a variation of solid-phase microextraction (SPME) and membrane introduction mass spectrometry (MIMS), is employed with a miniature mass spectrometer. The inlet system, constructed of commercially available vacuum parts, allows the direct introduction of the SPME needle vacuum chamber into the mass spectrometer. Thermal desorption of the analyte from the poly(dimethylsiloxane) (PDMS) coated fiber was achieved with a built in nichrome heater, followed by electron ionization of the analytes internal to the cylindrical ion trap (CIT). The system has been tested with several volatile organic compounds (VOC) in air and to analyze the headspace over aqueous solutions, with limits of detection in the low ppb range. The signal rise (10–90%) and fall (90–10%) times for the system ranged from 0.1 to 1 s (rise) and 1.2 to 6 s (fall) using heated desorption. In addition, this method has been applied to quantitation of toluene in benzene, toluene, xylene (BTX) mixtures in water and gasoline. This simple and rapid analysis method, coupled to a portable mass spectrometer, has been shown to provide a robust, simple, rapid, reproducible, accurate and sensitive (low ppb range) fieldable approach to the effective in situ analysis of VOC in various matrices.

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Publication details

The article was received on 18 Jul 2003, accepted on 30 Jul 2003 and first published on 15 Aug 2003

Article type: Paper
DOI: 10.1039/B308292J
Citation: Analyst, 2003,128, 1119-1122
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    Solid phase micro-extraction in a miniature ion trap mass spectrometer

    L. S. Riter, E. C. Meurer, I. Cotte-Rodriguez, M. N. Eberlin and R. Graham Cooks, Analyst, 2003, 128, 1119
    DOI: 10.1039/B308292J

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