DOI: 10.1016/j.epsl.2021.116892
论文题名: Carboxylate anion generation in aqueous solution from carbonate radiolysis, a potential route for abiotic organic acid synthesis on Earth and beyond
作者: Vandenborre J. ; Truche L. ; Costagliola A. ; Craff E. ; Blain G. ; Baty V. ; Haddad F. ; Fattahi M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 564 语种: 英语
中文关键词: acetate
; carbon cycling
; chemical yield
; deep biosphere
; formate
; oxalate
英文关键词: Carbon dioxide
; Carbonation
; Carboxylation
; Gamma rays
; Groundwater
; Hydrogen production
; Negative ions
; Petroleum tar
; Radiation chemistry
; Radiolysis
; Acetate
; Carbon cycling
; Carboxylate anions
; Chemical yields
; Deep biosphere
; Formate
; Low molecular weight
; Organics
; Radiation-induced
; Subsurface microbial ecosystems
; Oxalic acid
; abiotic factor
; acetate
; anion
; aqueous solution
; biosphere
; carbon cycle
; carbonate
; organic acid
; oxalate
英文摘要: Low molecular weight carboxylate anions such as formate (HCOO−), acetate (CH3COO−) and oxalate (C2O42−) have been shown to play an important role in supporting deep subsurface microbial ecosystems. Their origin whether biological or abiotic is currently highly debated, but surprisingly radiolytic production has rarely been considered, as it is the case for H2. Here, we address this question through dedicated irradiation experiments. Aqueous solutions containing carbonate, formate, acetate or oxalate have been irradiated using both the 60.7 MeV α-beam of the ARRONAX cyclotron (Nantes, France) and 661.7 keV γ-Ray in order to reveal the mechanism and chemical yield of radiation-induced dissolved carbonate degradation. The yields (G-values) of carboxylate anions production/degradation in low-concentration carbonate solution (0.01 to 1 mmol L−1) are measured. Carbonate degradation occurs through three consecutive steps (Carbonate →I Formate →II Acetate →III Oxalate) involving formate radical (CO2−•), dihydrogen (H2), and carbon dioxide (CO2) generation. Dissolved carbonate radiolysis provides a consistent pathway for both enhancing two-fold the radiolytic H2 production compared to pure water and generating carboxylic species, chiefly oxalate, readily available for microbes. Radiation-induced carbonate degradation may produce substantial amount (millimolar concentration) of carboxylate anions in ancient groundwaters from deep crystalline bedrocks. Subsurface lithoautotrophic microbial ecosystems may not only be supported by radiolytic H2 but also by carboxylate species from carbonate radiolysis. Carbonate radiolysis can be also an endogenous source of carboxylate species on Mars and other planetary bodies. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165696
Appears in Collections: 气候变化与战略
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作者单位: Subatech, UMR 6457, Institut Mines-Télécom Atlantique, CNRS/IN2P3, Université de Nantes, 4, Rue Alfred Kastler, La chantrerie BP 20722, 44307, Nantes cedex 3, France; GIP ARRONAX, 1 rue ARRONAX, CS 10112, Saint-Herblain Cedex, 44817, France; University Grenoble Alpes, CNRS, ISTerre, CS 40700, Grenoble, 38058, France
Recommended Citation:
Vandenborre J.,Truche L.,Costagliola A.,et al. Carboxylate anion generation in aqueous solution from carbonate radiolysis, a potential route for abiotic organic acid synthesis on Earth and beyond[J]. Earth and Planetary Science Letters,2021-01-01,564