@article{fdi:010035587,
  title = {{S}ources of trace metals in {F}erralsols in {N}ew {C}aledonia},
  author = {{B}ecquer, {T}hierry and {Q}uantin, {C}. and {R}otte {C}apet, {S}. and {G}hanbaja, {J}. and {M}ustin, {C}. and {H}erbillon, {A}. {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{O}ne third of {N}ew {C}aledonia is occupied by soils deriving from ultrabasic rocks anomalously rich in trace metals such as {C}r, {N}i, {M}n and {C}o. {T}he location of the metals present in three samples from a toposequence of {F}erralsols was studied by combining selective dissolutions ({C}a{C}l2, {C}u({NO}3)(2), hydroxylamine, dithionite-citrate-bicarbonate), examinations with a transmission electron microscope ({TEM}) equipped with an {EDAX} device, and {X}-ray diffraction and infrared spectroscopy. {T}he behaviour of the metals during dissolution was found to depend on both the type of metal and the location of the samples in the toposequence. {I}n the lowland soil samples derived from transported materials, about 50% of total {M}n and {C}o and a small fraction (< 1%) of total {N}i were dissolved in the hydroxylamine reagent. {B}y {TEM}, the manganese oxide minerals present in one of the lowland samples were found to have chemical compositions similar to those of lithiophorite-asbolane mixed layers identified previously in the subsurface horizons of the laterites capping the landscape where the toposequence occurs. {W}hatever the location of samples, goethite, i.e. the major constituent of these soils, was found to be the scavenger of the largest proportions of {N}i and of about 40% of total {C}r. {H}owever, this mineral was present as two distinct morphological facies, and each of them had a statistically different chemical composition. {T}he small needle-shaped goethite, which was abundant in the lowland soils only, was richer in {N}i and {S}i and poorer in {A}l than the larger acicular one. {O}ur data show that the potential mobility of trace metals in these soils is likely to be controlled by the most soluble phases identified, i.e. the {C}o-rich {M}n oxides and the {N}i-rich needle-shaped goethites.},
  keywords = {},
  booktitle = {},
  journal = {{E}uropean {J}ournal of {S}oil {S}cience},
  volume = {57},
  numero = {2},
  pages = {200--213},
  ISSN = {1351-0754},
  year = {2006},
  DOI = {10.1111/j.1365-2389.2005.00730.x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010035587},
}