@article{fdi:010062357,
  title = {{S}table carbon isotope biogeochemistry of propionate and acetate in methanogenic soils and lake sediments},
  author = {{C}onrad, {R}. and {C}laus, {P}. and {C}hidthaisong, {A}. and {L}u, {Y}. and {S}cavino, {A}. {F}. and {L}iu, {Y}. and {A}ngel, {R}. and {G}aland, {P}. {E}. and {C}asper, {P}. and {G}u{\'e}rin, {F}r{\'e}d{\'e}ric and {E}nrich-{P}rast, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n anoxic environments, degradation of organic matter ({OM}) results in strong fractionation of carbon isotopes, with formation of {C}-13-depleted {CH}4. {P}ropionate and acetate are important products of {OM} fermentation. {P}ropionate is further fermented to acetate. {A}cetate is a direct precursor of {CH}4, the remainder usually being produced from {H}-2-mediated {CO}2 reduction. {T}here is a paucity of data for the turnover of acetate and, even more so, propionate. {W}e therefore analyzed the d 13{C} values of organic carbon, propionate, acetate and the methyl ({M}e) group of acetate (acetate-{M}e) during the production of {CH}4 in anoxic incubations of various flooded and non-flooded soils and various lake sediments. {I}ncubation in the presence of {CH}3{F}, which inhibits {CH}4 production from acetate, allowed exclusion of isotope effects during aceticlastic methanogenesis. {D}espite the variation inherent in the wide diversity of sample type and origin, the data collectively showed that the d {C}-13 value of acetate was only marginally different (-2 +/- 5%) from that of {OM}, while propionate was depleted in {C}-13 relative to total acetate (-6 +/- 5 parts per thousand). {A}cetate-{M}e was generally depleted in {C}-13 relative to total acetate (- 8 +/- 5%). {T}hus, isotopic enrichment factors during the degradation of {OM} to total propionate and acetate were much smaller than those during hydrogenotrophic and aceticlastic methanogenesis or the intramolecular difference in d 13{C} between the carboxyl ({CO}2{H}) and {M}e of acetate, so that the d {C}-13 value of {OM} may be used as a proxy when data for acetate are not available.},
  keywords = {{A}cetate ; {P}ropionate ; {M}ethane ; {O}rganic matter ; {F}ermentation ; {I}sotope fractionation ; {A}noxic soil ; {L}ake sediment ; {BRESIL} ; {THAILANDE} ; {CAMEROUN} ; {ZONE} {TROPICALE} ; {ALLEMAGNE} ; {CHINE} ; {URUGUAY} ; {ZONE} {TEMPEREE} ; {ETATS} {UNIS} ; {ISRAEL} ; {AUSTRALIE} ; {ZONE} {ARIDE} ; {ZONE} {SEMIARIDE} ; {TIBET} ; {ZONE} {D}'{ALTITUDE} ; {FINLANDE}},
  booktitle = {},
  journal = {{O}rganic {G}eochemistry},
  volume = {73},
  numero = {},
  pages = {1--7},
  ISSN = {0146-6380},
  year = {2014},
  DOI = {10.1016/j.orggeochem.2014.03.010},
  URL = {https://www.documentation.ird.fr/hor/fdi:010062357},
}