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| Titel |
Transfer of rare earth elements from natural metalliferous (copper and cobalt rich) soils into plant shoot biomass of metallophytes from Katanga (Democratic Republic of Congo) |
| VerfasserIn |
Olivier Pourret, Bastien Lange, Petru Jitaru, Grégory Mahy, Michel-Pierre Faucon |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250091952
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| Publikation (Nr.) |
 EGU/EGU2014-6272.pdf |
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| Zusammenfassung |
| The geochemical behavior of rare earth elements (REE) is generally assessed for the
characterization of the geological systems where these elements represent the best proxies of
processes involving the occurrence of an interface between different media. REE behavior is
investigated according to their concentrations normalized with respect to the upper
continental crust. In this study, the geochemical fingerprint of REE in plant shoot biomass of
an unique metallicolous flora (i.e., Crepidorhopalon tenuis and Anisopappus chinensis) was
investigated. The plants originate from extremely copper and cobalt rich soils, deriving from
Cu and Co outcrops in Katanga, Democratic Republic of Congo. Some of the species
investigated in this study are able to accumulate high amounts of Cu and Co in shoot hence
being considered as Cu and Co hyperaccumulators. Therefore, assessing the behavior of REE
may lead to a better understanding of the mechanisms of metal accumulation by this
flora.
The data obtained in this study indicate that REE uptake by plants is not primarily
controlled by their concentration and speciation in the soil as previously shown in the
literature (Brioschi et al. 2013). Indeed, the REE patterns in shoots are relatively flat
whereas soils patterns are Middle REE enriched. In addition, it is worth noting that
Eu enrichments occur in aerial parts of the plants. These positive Eu anomalies
suggest that Eu3+ can form stable organic complexes replacing Ca2+ in several
biological processes as in xylem fluids associated with the general nutrient flux.
Therefore, is is possible that the Eu mobility in these fluids is enhanced by its reductive
speciation as Eu2+. Eventually, the geochemical behavior of REE illustrates that metals
accumulation in aerial parts of C. tenuis and A. chinensis is mainly driven by dissolved
complexation.
Brioschi, L., Steinmann, M., Lucot, E., Pierret, M., Stille, P., Prunier, J., Badot, P., 2013.
Transfer of rare earth elements (REE) from natural soil to plant systems: implications for the
environmental availability of anthropogenic REE. Plant and Soil, 366, 143-163. |
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