Charakterisierung eines Gaschromatographie - Massenspektrometrie-Systems hinsichtlich der Eignung als Routinemeßgerät für Laborund Feldmessungen von Kohlenwasserstoffen im pptV-Bereich
Charakterisierung eines Gaschromatographie - Massenspektrometrie-Systems hinsichtlich der Eignung als Routinemeßgerät für Laborund Feldmessungen von Kohlenwasserstoffen im pptV-Bereich
A modified commercially available gas chromatography-mass spectrometry system was investigated with respect to the suitability of the system for trace gas analysis of hydrocarbons in the pptV-mixing range. As a first step the chromatographie resolution was optimized to allow the quantitation of subs...
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Personal Name(s): | Heiden, Arnd C. (Corresponding author) |
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Contributing Institute: |
Institut für Chemie und Dynamik der Geosphäre; ICG |
Imprint: |
Jülich
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
1995
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Physical Description: |
IV, 97 S. |
Document Type: |
Report |
Series Title: |
Berichte des Forschungszentrums Jülich
3106 |
Link: |
OpenAccess |
Publikationsportal JuSER |
A modified commercially available gas chromatography-mass spectrometry system was investigated with respect to the suitability of the system for trace gas analysis of hydrocarbons in the pptV-mixing range. As a first step the chromatographie resolution was optimized to allow the quantitation of substances in a typical mixture of terpenes and sesquiterpenes. Sufficient resolution was obtained for all investigated substances including the weil known problem pairs like limonene/eucalyptol and $\alpha$-humulene/trans-caryophyllene. Liquid standards were used to optimize the injection eonditions and to test the reproducibility and the linearity of the system. Furthermore, these standards were used to determine the detection limits and the limits of quantitation for the individual substances within different detection modes. For constant parameters of the injection port the reproducibilities are in the range of 3 % to 6 % in the Scan mode and between 2 % and 4.5 % in the SIM mode. For both detection modes the linearity is guaranteed in the concentration range between 0.3 and 8.5 ng/$\mu$L. Deviations from linemity of the system were found for the TII mode. Lower limits of quantitation for the Scan mode ranged from 1.5 $\cdot$ 10$^{-11}$ g for pentadecane up to 3.9 $\cdot$ 10$^{-11}$ g for myrcene. Improvements of the detection and quantitation limits were realized by using the SIM mode or aselection of target ions in the SIM mode. Improved lower limits of quantitation were in the range between 9.2 $\cdot$ 10$^{-13}$ g for pentadecane and 3.9 $\cdot$ 10$^{-12}$ g for myrcene. The long-time stability and linearity of a permeation source for terpene compounds was investigated. This device was used for the characterisation of the system using the method of thermal desorption. Identical experiments as for the method of liquid injection were caried out. After optimization of the injection system through reprocessing steps and silanisation of all glass parts of the injection system, limits of quantitation in the range from 10$^{-11}$ to 4 $\cdot$ 10$^{-10}$ g were found in the Scan mode. The linemity of the system was guaranteed for emichments between 0.1 and 90 ng for several substances in the investigated dynamic range. Reproducibilities were found to be better than 10 % except for the sesquiterpene $\alpha$-humulene. [...] |