Dissolved organic matter fluorescence as a water-flow tracer in the tropical wetland of Pantanal of Nhecolandia, Brazil

M. Mariot 1 Y. Dudal 2 S. Furian 3 A. Sakamoto 4 V. Valles 1 Monique Fort 5 Laurent Barbiero 6, *
* Corresponding author
1 LHA - Laboratoire d'Hydrogéologie d'Avignon
2 UMR CSE 1114 - Unité mixte de recherche Climat Sol et Environnement
3 Laboped - Laboratorio de pedologia
4 Laboratório de Pedologia, Departamento de Geografia
5 PRODIG - Pôle de recherche pour l'organisation et la diffusion de l'information géographique
6 LMTG - Laboratoire des Mécanismes et Transfert en Géologie
Abstract : The Nhecolandia is a sub-region of the Brazilian Pantanal wetland, where saline and freshwater lakes coexist in close proximity. Measurements of dissolved organic carbon (DOC) content and analysis of fluorescence excitation-emission matrices (EEM) were conducted in an effort to characterize spatial variability in concentration and source of dissolved organic matter (DOM) and to further understand the hydrochemical functioning of this complex environment. Increasing pH under the influence of evaporation resulted in an increasing DOC solubility ranging from 50 to over 300 mgC L-1 in surface water. Spectrofluorescence characterisation indicates the presence of several families of dissolved organic matter (fulvic and humic-type and proteinaceous materials), which are related to the type of lake and its hydro-bio-geochemical functioning. Moreover, the fluorescence signatures from lake water DOM and from surrounding soil-water-extracted organic matter (WEOM) show strong similarities although some labile proteinaceous compounds disappeared during humification. Results from the characterisation of DOM and WEOM not only suggest that spectrofluorescence is a reliable technique for the tracing of water flows, but also for the marking of the origin of organic horizons in this environment.
Keywords : Brazil pantanal organic matter tracing alkaline wetland spectrofluorecence
Document type :
Journal articles
Complete list of metadatas

Cited literature [20 references]  Display  Hide  Download
https://hal.ird.fr/ird-00363984
Contributor : Laurent Barbiero <>
Submitted on : Wednesday, February 25, 2009 - 7:31:44 AM
Last modification on : Sunday, January 19, 2020 - 6:38:11 PM
Long-term archiving on: Tuesday, June 8, 2010 - 10:54:20 PM

File

STOTEN-pour_HAL.pdf
Files produced by the author(s)

Identifiers

Collections

IRD | UNIV-PARIS1 | CNRS | INRA | EPHE | OMP | OMP-GET | PRODIG-PUBLICATIONS | PSL | SORBONNE-UNIVERSITE | UNIV-AVIGNON | UNIV-PARIS7 | USPC | UNIV-TLSE3 | SU-LETTRES | CAMPUS-CONDORCET

Citation

M. Mariot, Y. Dudal, S. Furian, A. Sakamoto, V. Valles, et al.. Dissolved organic matter fluorescence as a water-flow tracer in the tropical wetland of Pantanal of Nhecolandia, Brazil. Science of the Total Environment, Elsevier, 2007, 388 (1-3), pp.184-193. ⟨10.1016/j.scitotenv.2007.08.003⟩. ⟨ird-00363984⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

811

Files downloads

745

Contact

Informations

CCSD