Numéro |
J. Phys. IV France
Volume 107, May 2003
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Page(s) | 1301 - 1304 | |
DOI | https://doi.org/10.1051/jp4:20030539 |
J. Phys. IV France 107 (2003) 1301
DOI: 10.1051/jp4:20030539
Mercury mobilization in soil from a rainfall event in a Tropical forest (French Guyana)
E. Tessier1, D. Amouroux1, M. Grimaldi2, T. Stoichev1, C. Grimaldi2, G. Dutin3 and O.F.X. Donard11 Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, UMR 5034 du CNRS, UPPA, Pau, France
2 UR Biodiversité et Fonctionnement du Sol, IRD, Belém, Brazil
3 UMR Sol Agronomie Spatialisation, INRA Rennes, France
Abstract
Mercury (Hg) distribution was achieved in a pristine Amazonian forested area during a
rainfall event along a basin thalweg. Hg concentrations were measured in both surface runoff and
underground waters and soils. Total Hg concentrations in the particulate and dissolved phase were
related to the main hydrological processes in order to trace the fate of mercury during the flood
event. Rainfall waters were also collected to assess the amount of Hg from atmospheric deposition
and foliage leaching. Total Hg concentrations were found relatively homogenous over thé basin and
were typical of remote area (9 ng l
-1). In addition, air samples collected at the same site, at the
ground level and at different heights (1-40m), which allowed us to determine temporal and spatial
variability of total gaseous atmospheric Hg. Finally, dynamic flux chambers experiments were
carried out to directly determine the exchanges of gaseous Hg at the soil/atmosphere interface, in
order to better understand the role of the atmospheric compartment within the forest ecosystem.
© EDP Sciences 2003