期刊
GEOCHIMICA ET COSMOCHIMICA ACTA
卷 75, 期 4, 页码 1057-1071出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.gca.2010.11.009
关键词
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资金
- National Basic Research Program of China [2011CB808800]
- National Science Foundation of China [41030211]
- US Department of Energy [DE-FG02-07ER64369]
- US Department of Defense Strategic Environmental Research and Development Program (SER-DP) [ER-1685]
- 111 Project [B07011, B08030]
- CUG-Wuhan
- Key Laboratory of Biogeology and Environmental Geology of Ministry of Education [BGEGF200819]
Clay minerals and methanogens are ubiquitous and co-exist in anoxic environments, yet it is unclear whether methanogens are able to reduce structural Fe(III) in clay minerals. In this study, the ability of methanogen Methanosarcina barkeri to reduce structural Fe(III) in iron-rich smectite (nontronite NAu-2) and the relationship between iron reduction and methanogenesis were investigated. Bioreduction experiments were conducted in growth medium using three types of substrate: H-2/CO2, methanol, and acetate. Time course methane production and hydrogen consumption were measured by gas chromatography. M. barkeri was able to reduce structural Fe(III) in NAu-2 with H-2/CO2 and methanol as substrate, but not with acetate. The extent of bioreduction, as measured by the 1,10-phenanthroline method, was 7-13% with H-2/CO2 as substrate, depending on nontronite concentration (5-10 g/L). The extent was higher when methanol was used as a substrate, reaching 25-33%. Methanogenesis was inhibited by Fe(III) reduction in the H-2/CO2 culture, but enhanced when methanol was used. High charge smectite and biogenic silica formed as a result of bioreduction. Our results suggest that methanogens may play an important role in biogeochemical cycling of iron in clay minerals and may have important implications for the global methane budget. (C) 2010 Elsevier Ltd. All rights reserved.
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