Detection of microbial volatile organic compounds (MVOCs) by ion-mobility spectrometry |
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Authors: | Carlo Tiebe Hans Miessner Bernhard Koch Thomas Hübert |
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Institution: | (1) BAM Federal Institute for Materials Research and Testing, 12200 Berlin, Germany;(2) I.U.T. Institute for Environmental Technologies GmbH, 12489 Berlin, Germany; |
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Abstract: | Traces of microbial volatile organic compounds (MVOCs) in air can indicate the presence of growth of moulds in the indoor
environment. Ion-mobility spectrometry is a very promising method for detection of these MVOCs, because of its high sensitivity.
For development of an in-situ method for detection of MVOCs, a portable ion-mobility spectrometer (IMS) was used and test
gases of 14 MVOCs and their respective mixtures were investigated. IMS spectra were recorded as a function of concentration
of MVOCs in air. Drift time and mobility of reactant ions formed in positive polarity mode were determined and correlated
with the mass-to-charge ratio (m/z) of the MVOCs investigated. The estimated detection limit has a specific value for each MVOC and is in the range 3 to 96 μg
m−3 (1 to 52 ppbV). Indoor trials show that IMS can indicate hidden mould growth. |
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