@article{fdi:010074390,
  title = {{M}ercury isotopic fractionation during pedogenesis in a tropical forest soil catena ({F}rench {G}uiana) : deciphering the impact of historical gold mining},
  author = {{G}u{\'e}dron, {S}t{\'e}phane and {A}rnouroux, {D}. and {T}essier, {E}. and {G}rirnaldi, {C}. and {B}arre, {J}. and {B}erail, {S}. and {P}errot, {V}. and {G}rimaldi, {M}ichel},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e used natural mercury ({H}g) stable isotopes to investigate the {H}g cycle in a rainforest soil catena ({F}rench {G}uiana) partially gold-mined during the early 1950s. {L}itterfall showed homogeneous {D}elta {H}g-199 values [-0.18 +/- 0.05 parts per thousand, i.e., a modern gaseous elemental {H}g ({GEM}) isotopic signature]. {A}fter litter decomposition, {H}g bound to organic matter ({OM}) is mixed with {H}g from pristine (-0.55 +/- 0.22 parts per thousand) or gold-mined (-0.09 +/- 0.16 parts per thousand) mineral materials. {N}egative {D}elta {H}g-199 values in deep pristine mineral horizons (-0.60 +/- 0.16700) suggest the transfer of {H}g bound to dissolved {OM} depleted in odd isotopes due to mass-independent fractionation during {H}g abiotic reduction. {P}erennial palm tree leaves collected above gold-mined and pristine soil recorded contrasting {D}elta {H}g-199 signatures likely resulting from {GEM} re-emission processes from soils and leaf surfaces. {U}pslope, soil delta {H}g-202 signatures showed a negative shift (epsilon similar to -1 parts per thousand) with depth attributed to mass-dependent fractionation during {H}g sorption and complexation onto iron oxides and dissolved {OM}. {D}ownslope, higher delta {H}g-202 values in soils resulted from hydromorphy [lower humification, greater {H}g({II}) reduction, etc.]. {T}he unique {H}g isotopic signatures of {A}mazonian soils probably result in multistep fractionation processes during pedogenesis (millions of years) and in a potentially different {H}g isotopic signature of preanthropogenic background {GEM}.},
  keywords = {{GUYANE} {FRANCAISE} ; {AMAZONIE} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{E}nvironmental {S}cience and {T}echnology},
  volume = {52},
  numero = {20},
  pages = {11573--11582},
  ISSN = {0013-936{X}},
  year = {2018},
  DOI = {10.1021/acs.est.8b02186},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074390},
}