 |
| Titel |
BioGeochemistry of antimony, Sources, Transfers, Impacts and Assessment |
| VerfasserIn |
Gaël Le Roux, Eric Pinelli, Mickaël Hedde, Maritxu Guiresse, François De Vleeschouwer, Jérôme Silvestre, Maxime Enrico, Laure Gandois, Fabrice Monna, Charles Gers, Anne Probst |
| Konferenz |
EGU General Assembly 2013
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250074652
|
|
|
|
|
|
| Zusammenfassung |
| BioGeoSTIB is a project funded by ADEME (French Environmental Protection Agency).
Its aim is to provide a better understanding of biogeochemical cycle disturbances
of antimony by man. Specifically, it is focused on the atmosphere-soil-organism
interfaces. Based on a multi-scale approach, the impact of antimony on organisms
and organism communities and the factors of Sb dispersion in the environment
aim to better characterized. This report gives the main results of 2 and 1 -2 years of
research.
Using peat bogs as environmental archives, we show that Sb contamination in soils date
back to the beginning of the metallurgy. Atmospheric deposition of Sb largely increased by
100 times during the Industrial Revolution compared to natural levels (~0,001-0,01 mg
m-2 an-1) estimated in the deepest peat layers. This disturbance in the antimony
geochemical cycle modified its concentrations in soils. One main source of present
Sb contamination is automotive traffic due to Sb in braking lines. This emerging
contamination was characterized close to a roundabout. This additional source of Sb does
not seem to impact soil fauna but Sb concentrations in soil solutions exceed 1 μg
L-1.
Genotoxicity tests have been performed on the model plant Vicia faba and show that
antimony is genotoxic at its lowest concentrations and that there is a synergistic effect lead, a
trace metal frequently found in association with antimony in the environment.
It is a main issue to determine Sb critical loads in the environment but main identified
lacks are thermodynamic data, which are not available yet, to model the behavior of Sb in soil
solutions and the fact the antimony is always associated with other anthropogenic trace
metals like lead.
Critical thresholds of Sb have been determined for the first time based on genotoxicity
experiment. Simulations show that these thresholds can be exceeded in the future, whereas
present limits for invertebrates (US-EPA) are and will not be reached. However, scientific
problems to complete the "critical load" approach are, as stated aabove, present lack of
thermodynamic data on Sb to model its behavior in the soil solution and the fact the
Sb is always linked to other trace metals, with potential ecological impacts too. |
|
|
|
|
|
|