globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12220
Scopus记录号: 2-s2.0-85007382095
论文题名:
Evidence of molybdenum association with particulate organic matter under sulfidic conditions
作者: Dahl T.W.; Chappaz A.; Hoek J.; McKenzie C.J.; Svane S.; Canfield D.E.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期:2
起始页码: 311
结束页码: 323
语种: 英语
Scopus关键词: anoxic conditions ; concentration (composition) ; enzyme activity ; euxinic environment ; iron ; marine environment ; molybdenum ; paleoenvironment ; particulate organic matter ; precipitation (chemistry) ; scavenger ; scavenging (chemistry) ; sulfide ; molybdenum ; bacterium ; chemistry ; particulate matter ; sediment ; Bacteria ; Geologic Sediments ; Molybdenum ; Particulate Matter
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: The geochemical behavior of molybdenum (Mo) in the oceans is closely linked to the presence of sulfide species in anoxic environments, where Fe availability may play a key role in the Mo scavenging. Here, we show that Mo(VI) is reduced in the presence of particulate organic matter (represented by sulfate-reducing bacteria). Molybdenum was immobilized at the surface of both living cells and dead/lysed cells, but not in cell-free control experiments. Experiments were carried out at four different Mo concentrations (0.1 to 2 mm) to yield cell-associated Mo precipitates with little or no Fe, consisting of mainly Mo(IV)-sulfide compounds with molecular structures similar to Mo enzymes and to those found in natural euxinic sediments. Therefore, we propose that Mo removal in natural sulfidic waters can proceed via a non-Fe-assisted pathway that requires particulate organic matter (dead or living sulfate-reducing bacteria). This pathway has implications for global marine Mo cycling and the current use of Mo-based proxies for paleo-environmental investigations. © 2016 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85070
Appears in Collections:影响、适应和脆弱性

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作者单位: Nordic Center for Earth Evolution and University of Southern Denmark, Odense M, Denmark; Department of Earth and Atmospheric Sciences, Central Michigan University, Mount Pleasant, MI, United States; Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Odense M, Denmark; Natural History Museum of Denmark, University of Copenhagen, Copenhagen K, Denmark; Department of Geology, University of Maryland, College Park, MA, United States

Recommended Citation:
Dahl T.W.,Chappaz A.,Hoek J.,et al. Evidence of molybdenum association with particulate organic matter under sulfidic conditions[J]. Geobiology,2017-01-01,15(2)
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