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Recovery of in-situ methanotrophic activity following acetylene inhibition

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Abstract

Methane (CH4) is the second most important greenhouse gas after carbon dioxide (CO2). To understand CH4 cycling, quantitative information about microbial CH4 oxidation in soils is essential. Field methods such as the gas push-pull test (GPPT) to quantify CH4 oxidation are often used in combination with specific inhibitors, such as acetylene (C2H2). Acetylene irreversibly binds to the enzyme methane monooxygenase, but little is known about recovery of CH4 oxidation activity after C2H2 inhibition in situ, which is important when performing several experiments at the same location. To assess recovery of CH4 oxidation activity following C2H2 inhibition, we performed a series of GPPTs over 8 weeks at two different locations in the vadose zone above a petroleum hydrocarbon-contaminated aquifer in Studen, Switzerland. After 4 weeks a maximum recovery of 30% and 50% of the respective initial activity was reached, with a subsequent slight drop in activity at both locations. Likely, CH4 oxidation activity and CH4 concentrations were too low to allow for rapid recovery following C2H2 inhibition at the studied locations. Therefore, alternative competitive inhibitors have to be evaluated for application in conjunction with GPPTs, especially for sites with low activity.

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Abbreviations

GFC:

Gas flow controller

GPPT:

Gas push-pull test

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Acknowledgements

We would like to thank Guy Kneip for his initial work on recovery from C2H2 inhibition, which provided valuable information for this study. We would also like to thank Rang Cho, David Müller, Philipp Nauer and Juliane Wischnewski (ETH Zurich) for help with field work. Funding for the research was provided by ETH Zurich, in part through Grant TH-20 06-3. Helpful suggestions by two anonymous reviewers were greatly appreciated.

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Correspondence to Martin H. Schroth.

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Urmann, K., Schroth, M.H. & Zeyer, J. Recovery of in-situ methanotrophic activity following acetylene inhibition. Biogeochemistry 89, 347–355 (2008). https://doi.org/10.1007/s10533-008-9223-6

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  • DOI: https://doi.org/10.1007/s10533-008-9223-6

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