@article{fdi:010084384,
  title = {{F}ield availability and mobility of metals in {F}erralsols developed on ultramafic rock of {N}iquelandia, {B}razil},
  author = {{G}arnier, {J}. and {Q}uantin, {C}. and {R}aous, {S}. and {G}uimaraes, {E}. and {B}ecquer, {T}hierry},
  editor = {},
  language = {{ENG}},
  abstract = {{U}ltramafic ({UM}) rocks are defined as igneous rocks that contain more than 90% of mafic minerals. {S}oils derived from ultramafic rock are generally nutrient-deficient and have concomitant high concentrations of potentially phytotoxic trace elements ({N}i, {C}r, {C}o, {M}n). {C}onsequently, to assess the dynamics of nutrients and metals in the ultramafic complex of {N}iquelandia ({B}razil), soil solutions have been sampled in soils characterized by high {C}r({VI}) availability. {T}he metal contents in surficial water have also been analyzed to investigate the metals' leaching and mobility. {S}oil solutions featured low nutrient contents, a large {C}a:{M}g imbalance, and high {N}i and {C}r concentrations. {C}hromium was present in its toxic dissolved form ({C}r({VI})) in the soil and surficial solutions. {M}etals concentrations were often above the toxic limit for biota and were therefore able to affect soil functioning. {N}i behavior in the topsoil appeared to be primarily controlled by organic matter, while {C}r was more likely to be released from {F}e-oxides by anionic exchange. {T}his result agreed with the {C}r({VI}) lability assessed using isotopic exchange kinetics in a companion study. {I}n these serpentinic tropical soils, the highly leached {F}e-oxide horizons appear to play a large role in the sequestration and diffuse leaching of labile {C}r({VI}) and {N}i, respectively, in the deeper part of soil profiles and the topsoil. {A}t the catchment scale, surficial solutions results suggest that metals may be exported to surrounding ecosystems that are not adapted to these metals.},
  keywords = {chromium ; nickel ; soil solution ; runoff ; serpentine syndrome ; metal ; toxicity ; {BRESIL} ; {NIQUELANDIA}},
  booktitle = {},
  journal = {{B}razilian {J}ournal of {G}eology},
  volume = {51},
  numero = {1},
  pages = {e20200092 [12 p.]},
  ISSN = {2317-4889},
  year = {2021},
  DOI = {10.1590/2317-4889202120200092},
  URL = {https://www.documentation.ird.fr/hor/fdi:010084384},
}