Abstract
Depth profiles of the oxygen and methane concentrations and the redox potential in an intact peat monolith were obtained. Three methods of O 2-determination were compared; membrane inlet quadrupole mass spectrometry, an oxygen electrode and Photobacterium bioluminescence. The most sensitive at low (nmol) concentrations was the Photobacterium probe where O 2 was detectable at 5 cm depth. The mass spectrometer has the advantage at higher (μmol) concentrations of multi-species (O 2, CO 2, CH 4, Ar) simultaneous monitoring; methane was detected in the peat core at the surface, and increased continuously to reach a maximum at 16 cm. A mass spectrometry miniprobe was constructed to allow precise measurement of gas profiles at intervals of 2 mm or less.
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