Transfer of Metallic trace elements by Dissolved Organic Matter to the ocean: contribution of mangRove
Responsible DUPOUY Cécile (MIO-IRD)
Participants MOUNIER Stéphane (MIO), OURSEL Benjamin (MIO), TEDETTI Marc (MIO), JUILLOT Farid (IMPMPC), JAMET Léocadie (IMAGO/LAMA), LEMONNIER Hugues (IFREMER), GUNKEL-GRILLON Peggy (UNC), BOHER Laura (M2), BESSARD Marie (M2)
The TREMOR project (2018-2021) is funded by CRESICA. The principal objective is to measure the contribution of the mangrove to the export of trace metallic elements complexed with CDOM to the lagoon of KONE, Northern Province of New Caledonia (site of nickel mining extraction) by using 3D spectrofluorescence and quenching experiments.
Research Axes concerned AR3 sources, transfer mechanisms, transformation of OM, of metallic contaminants at the atmosphere/water/plankton interface.
Description : During the first year of this project, (https://www.cresica.nc/projet/tremor) two transects of sampling were realised in high-water period, first in Témala river (considered as reference site) and second in Coco river probably impacted by the metal contamination due to its proximity with processing factory of Nickel. The concentrations of metals were obtained by ICP-Q-MS and the FDOM composition by method of fluorescence spectroscopy. The distribution of the complexation constants of fluorophore (Ks) was followed along river-mangrove-lagoon continuum through a quenching experiment series.
During the second and third year, the tide effect on the complexation will be studied by using automatic samplers placed in aval and amont of the mangrove forest.
References:
Boher, L., Mounier, SJuillot, F., Jamet, L., Dupouy, C., 2018. Saltmarsh organic matter fluorescence and metal interaction, Speed talk WOMS 2018, Carqueiranne, October 2018. http://www.univ-tln.fr/International-Workshop-on-Organic-Matter-Spectros…
Boher, L., 2018. Fluorescence quenching analysis of ETM complexation by fluorescent MOD along a river-mangrove-lagoon gradient in Koné (Northern Province of New Caledonia). Report M2 Univ. Brest, 30 pp.