@article{fdi:010055834,
  title = {{T}he partitioning of transitional metals ({F}e, {M}n, {N}i, {C}r) in mangrove sediments downstream of a ferralitized ultramafic watershed ({N}ew {C}aledonia)},
  author = {{M}archand, {C}yril and {F}ernandez, {J}.{M}. and {M}oreton, {B}. and {L}andi, {L}. and {L}allier-{V}erges, {E}. and {B}altzer, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n {N}ew {C}aledonia, one third of the {I}sland is composed of ultramafic rocks, and lateritic soils enriched in {F}e, {N}i and {C}r. {O}pen-cast mining occurs all around the {I}sland, and processes of erosion and sedimentation, which occur naturally along the coastline, are strongly amplified by mining activities. {D}ue to their position, at the interface between land and sea. mangroves receive extensive amounts of particles emanating from rivers through estuaries. {T}he purpose of this study is to understand the distribution and partitioning of some transitional metals ({F}e, {M}n, {N}i, {C}r) in sediments and pore-waters in a mangrove swamp, which is situated downstream of a catchment characterized by lateritic soils that were exploited a century ago. {Q}uantitative analyses on bulk and after selective extraction, were carried out on cores collected along a transect within the intertidal zone, i.e. beneath a {R}hizophora stylosa stand, an {A}vicennia marina stand, and within a salt flat. {M}ean metal concentrations were (mu mol g(-1)): {F}e (1997) > {N}i (44.2) > {C}r (31.9) > {M}n (8.8). {T}hus, {N}i, {C}r and {F}e concentrations in this study are substantially higher than mangrove world average. {I}n addition. {N}i concentrations are 10 to 100 times higher than in other {N}ew {C}aledonian mangrove developing downstream of a catchment not composed of ultramafic rocks. {T}he studied mangrove is characterized by gradients of water and organic contents with depth and along the intertidal zone, which induced different redox conditions, and thus different metals partitioning. {T}ransitional metals are deposited in the mangrove mainly as oxides and/or oxy-hydroxides, that are subsequently dissolved by bacteria for the decomposition of organic matter, and which leads to a strong increase of metals in the dissolved phase. {T}hen, dissolved metals were precipitated with organic and sulfide compounds. {T}o conclude, organic diagenesis in mangrove sediments leads to the transfer of transitional metals from oxide form to organic and sulfide forms.},
  keywords = {{M}angrove ; {T}ransitional metals ; {O}rganic matter ; {R}edox conditions ; {N}ew {C}aledonia},
  booktitle = {},
  journal = {{C}hemical {G}eology},
  volume = {300},
  numero = {},
  pages = {70--80},
  ISSN = {0009-2541},
  year = {2012},
  DOI = {10.1016/j.chemgeo.2012.01.018},
  URL = {https://www.documentation.ird.fr/hor/fdi:010055834},
}