@article{fdi:010031306,
  title = {{C}haracteristics of organic matter in the mixing zone of the {R}io {N}egro and {R}io {S}olimoes of the {A}mazon {R}iver},
  author = {{M}oreira {T}urcq, {P}atricia and {S}eyler, {P}atrick and {G}uyot, {J}ean-{L}oup and {E}tcheber, {H}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he nature and distribution of organic matter in the mixing zone of black ({R}io {N}egro) and white ({R}io {S}olimoes) waters in the {A}mazon {R}iver was studied to understand the processes responsible for its transport and distribution. {W}ater samples from 13 stations, including {R}io {N}egro, {R}io {S}olimoes and {R}io {M}adeira and ten stations downstream of the confluence with the {A}mazon, were collected during a low-water period. {P}articulate organic matter ({POM}; >0.7 mum) and dissolved organic matter ({DOM}; <0.7 mum) were quantified by analysing elemental carbon and nitrogen and by high-temperature catalytic oxidation, and characterized by infrared spectrometry and fluorescence microscopy. {W}e also performed adsorption experiments with {DOM} and alumina particles to determine the adsorption abilities and the nature of the most reactive {DOM}. {A}dsorption was estimated by measuring the amount of dissolved organic carbon ({DOC}) lost during the experiments. {W}e found a significant difference between the measured and theoretical fluxes of the two end members in {DOC} (-52%), particulate organic carbon (-32%), and particulate organic nitrogen (-59%). {T}his suggests that organic matter is not conservative at the confluence of the two rivers. {A}mong processes affecting {POM} and {DOM} during the mixing of the two rivers, adsorption may be one of the principal mechanisms by which the dissolved fraction is removed. {A}dsorption experiments showed that up to ca 40% of {DOC} can be removed by adsorption reactions. {F}urthermore, dissolved organic nitrogen was preferentially adsorbed onto alumina surfaces, which may be important for the fractionation of organic matter in the {A}mazon river system and seems to be related to the origin and freshness of the {DOM}.},
  keywords = {{COURS} {D}'{EAU} ; {MATIERE} {ORGANIQUE} {DISSOUTE} ; {MATIERE} {ORGANIQUE} {PARTICULEE} ; {TRANSPORT} {SOLIDE} ; {DISTRIBUTION} {SPATIALE} ; {CARBONE} {ORGANIQUE} ; {AZOTE} ; {RAPPORT} {C}/{N} ; {ANALYSE} {CHIMIQUE} ; {PH} ; {CONDUCTIVITE} ; {ADSORPTION} ; {GEOCHIMIE} ; {CHIMIE} {DE} {L}'{EAU} ; {AMAZONIE} ; {AMAZONE} {COURS} {D}'{EAU} ; {NEGRO} {COURS} {D}'{EAU} ; {SOLIMOES} {COURS} {D}'{EAU}},
  booktitle = {},
  journal = {{H}ydrological {P}rocesses},
  volume = {17},
  numero = {7},
  pages = {1393--1404},
  ISSN = {0885-6087},
  year = {2003},
  URL = {https://www.documentation.ird.fr/hor/fdi:010031306},
}