Rare Earth Elements fractionation in native vegetation from the Moncorvo iron mines, NE Portugal

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2014

Autores

Nuno Duraes (Autor) Outra; Eduardo Ferreira da Silva (Autor) Outra; Iuliu Bobos (Autor) FCUP; Paula Avila (Autor) Outra

Ata de Conferência Internacional

Título: GEOCHEMISTRY OF THE EARTH'S SURFACE GES-10

Páginas: 376-382

Geochemistry of the Earth's Surface (GES) Meeting

Paris, FRANCE, AUG 18-23, 2014

Indexação

ISI Web of Knowledge - 11 Citações

ISI Web of Science

Classificação Científica

FOS: Ciências exactas e naturais > Ciências da terra e ciências do ambiente

CORDIS: Ciências Naturais

Outras Informações

ID Authenticus: P-00A-170

DOI: 10.1016/j.proeps.2014.08.064

Abstract (EN): Fractionation of Rare Earth Elements (REE) and the accumulation and translocation indexes were measured and determined in the native vegetation [Halimium lasianthum (Lam.) Spach subsp. alyssoides (Lam.) Greuter; Cytisus multiflorus (L'Her.) Sweet; and Cistus monspeliensis L.; Cistus ladanifer subsp. ladanifer; Lavandula stoechas L.] from the iron mining area of Moncorvo (NE Portugal). There is no correlation between the amounts of REE in rhizosphere and in plants. The REE concentration as the fractionation follows roots>leaves>stems in plants. A slightly enrichment in HREE were found in rhizosphere and plants (roots and stems), whereas the leaves are enriched in LREE. The accumulation and translocation depend of internal complexes ligands. The redox and pH conditions of the rhizosphere conditioned the REE uptake. Greatest bioaccumulation ability of heavy REE (HREE) was found in C. monspeliensis, followed by H. lasianthum that also, has a high capacity of the REE translocation to the aerial parts, contrary to C. monspeliensis. An M-type tetrad effect was determined mainly for HREE (Gd-Ho series) indicating a complexation of REE. The greatest differences in the REE fractionation patterns (mainly for HREE) are observed in stems, as a consequence of the transport function of this organ. Cerium anomaly indicates that the pH and redox conditions affected the uptake of Ce by plants, where the free ionic species are dominated in roots and leaves (positive anomaly), and stems (negative anomaly). Also the Eu-anomaly is greater in roots and leaves than in steams probably by participation in metabolic functions due to similarity with calcium. (C) 2014 The Authors. Published by Elsevier B.V.

Idioma: Inglês

Tipo (Avaliação Docente): Científica