A system for on-line measurements of trace compounds in air with concentrations as low as a few pptv has been developed on the basis of proton transfer reactions. The sensitivity of this system is demonstrated by means of calibration data of benzene and data on the diurnal variation of C9-alkylbenzene and its 13 C-isotope in ambient air. First on-line data on the concentrations of volatile organic compounds obtained during plane flights are presented.
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Hansel et al. (1999) studied this question.
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