Abstract
The use of membrane-inlet mass spectrometry in the study of dissolved gas concentrations in the rumen was evaluated in order to assess the value of the technique as a tool for the study of microbial activity in ecosystems in situ. Four dissolved gases (CH4, CO2, H2, and O2) were measured simultaneously and continuously for short periods (up to 30 min) during the feeding period. These preliminary results have demonstrated the usefulness of the technique for monitoring microbial activity via gas production in a complex natural ecosystem.
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