期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 50, 期 -, 页码 158-163出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2012.03.018
关键词
Methane; Radiocarbon; Peat; Carbon; Greenhouse gases
类别
资金
- NERC
- NERC [NRCF010001] Funding Source: UKRI
- Natural Environment Research Council [NRCF010001] Funding Source: researchfish
We developed a method to determine the radiocarbon (C-14) concentration of methane (CH4) emitted from the surface of peatlands. The method involves the collection of similar to 9 L of air from a static gas sampling chamber which is returned to the laboratory in a foil gas bag. Carbon dioxide is completely removed by passing the sample gas firstly through soda lime and then molecular sieve. Sample methane is then combusted to CO2, cryogenically purified and subsequently processed using routine radiocarbon methods. We verified the reliability of the method using laboratory isotope standards, and successfully trialled it at a temperate raised peat bog, where we found that CH4 emitted from the surface dated to 195-1399 years BP. The new method provides both a reliable and portable way to C-14 date methane even at the low concentrations typically associated with peatland surface emissions. (C) 2012 Elsevier Ltd. All rights reserved.
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