Biogeoquímica dos elementos terras raras na Província Estanífera de Pitinga (AM)

Cunha, Maria do Carmo Lima e; Pereira, Vitor Paulo; Neto, Artur Cézar Bastos; Nardi, Lauro Valentim Stoll; Formoso, Milton Luiz Laquintinie; Menegotto, Egydio

doi:10.25249/0375-7536.2009393560566

Cited by 4 publications

(1 citation statement)

References 12 publications

(14 reference statements)

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“…The REE concentration varied from 1 to 500 ppm depending on the plant species, organs and soil concentration. However, the internal processes of plants can fractionated the REE (Ding et al, 2006;Lima e Cunha et al, 2009). For example, Ding et al (2006) observed MREE enrichment in the roots and MREE and HREE enrichment in the leaves.…”

Section: Impact Of Biological Parametersmentioning

confidence: 99%

Rare Earth Elements in Wetlands

Rinklebe¹,

Knox²,

Paller³

2016

Trace Elements in Waterlogged Soils and Sediments

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Section: Impact Of Biological Parametersmentioning

confidence: 99%

Rare Earth Elements in Wetlands

Rinklebe¹,

Knox²,

Paller³

2016

Trace Elements in Waterlogged Soils and Sediments

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Biogeochemical Factors Affecting Rare Earth Element Distribution in Shallow Wetland Groundwater

et al. 2014

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Wetlands are specific areas able to regulate metals mobility in the environment. Among metals, rare earth elements (REE) appear to be particularly interesting because of the information that could be provided by the REE patterns. Moreover, as REE are becoming a matter of great economic interest, their significant release into the environment may be expected over the next few decades. Wetlands would then play a key role in the regulation of their concentration in the environment. This review demonstrated that REE are released in wetland bound to colloidal organic matter. During the flood season, the released REE concentrations are largely higher than those released during the wet period. This solubilization is related to the organic matter desorption caused by the pH rise imposed by the reducing reactions. The resulting REE patterns depend on the heterogeneity of the humic acid (HA) binding sites and the presence of potential competitive cations, such as Fe(III) and Al(III). At high REE loading, REE are bound to HA carboxylic groups and the pattern exhibit a MREE downward concavity. At low loading, REE are bound to phenolic and chelate groups and the pattern exhibits a lanthanide contraction. At low loading, REE seem to act as cationic bridges between two organic molecules, whereas at high loading they seem to be engaged in strong multidentate bonding. Moreover, the REE patterns can be modified with the competitive cations amount and speciation. The prime factor governing all these processes is pH, which drives the organic colloid production, REE loading and solubility of competitive cations.

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