@article{fdi:010010455,
  title = {{B}iogeochemical control on the temporal variability of trace element concentrations in the {O}ubangui river ({C}entral {A}frican {R}epublic)},
  author = {{S}eyler, {P}atrick and {E}lbaz-{P}oulichet, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{D}issolved {B}a, {C}d, {C}o, {M}n, {M}o, {N}i, {R}b, {S}b, {S}r, {U} and {V} were measured in the {O}ubangui river ({C}entral {A}frican {R}epublic) during a complete flood period. {T}he dissolved concentrations vary by factors ranging from 1.4 to 8.2 as a function of river discharge : {S}r, {B}a, {R}b and {M}o concentrations decrease with rising stage ; {N}i, {U}, {S}b, {C}d, {V} and {M}n concentrations increase with rising stage. {T}hese distributions are explained by a mixing of quick flow, mostly surface runoff with delayed flow, mostly groundwater. {T}he dual origin of stream waters is demonstrated by the major element ratios, which are close to a silicate end-member during the high-flow period and trend towards a carbonate end-member during the low-flow period. {M}oreover, geological heterogeneities in the {O}ubangui basin may play a role in the variation of concentrations observed at the basin outlet. {T}he previously indicated presence of a subsurface carbonate sequence in the lower part of the basin is confirmed. {C}d, {V}, {M}n and {C}o show peak concentrations during decreasing stage. {W}e suggest that biological processes such as release from phytoplanktonic material and dissolution of oxides or carbonate phases may explain this maximum. ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{CHIMIE} {DE} {L}'{EAU} ; {GEOCHIMIE} ; {ELEMENT} {EN} {TRACE} ; {VARIATION} {TEMPORELLE} ; {CENTRAFRIQUE} ; {OUBANGUI} {COURS} {D}'{EAU}},
  booktitle = {},
  journal = {{J}ournal of {H}ydrology},
  volume = {180},
  numero = {1-4},
  pages = {319--332},
  ISSN = {0022-1694},
  year = {1996},
  URL = {https://www.documentation.ird.fr/hor/fdi:010010455},
}