Fractionations of rare earth elements in plants and their ...
12%Fractionations of rare earth elements (REEs) and their mechanisms in soybean were studied through application of exogenous mixed REEs under hydroponic conditions. Significant enrichment of middle REEs (MREEs) and heavy REEs (HREEs) was observed in plant roots and leaves respectively, with slight fractionation between light REEs (LREEs) and HREEs in stems. Moreover, …
Role of Ligands in Accumulation and Fractionation of Rare ...
The rare earth elements and Y (REY) geochemistry is considered to be an important tool to interpret the origin of banded iron formations (BIF) and paleo-ocean chemistry.
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Revisit of rare earth element fractionation during ...
Abstract Although rare earth element (REE) ... -induced mineral redistribution can further homogenize the weathering and pedogenic alterations and thus weaken the REE fractionations in river sediments. The mineral assemblage is the ultimate control on REE composition, and the Mn-Fe (hydro)oxides and secondary phosphate minerals are the main ...
A Look at Rare Earth Metals and Their Applications
Rare earth metals are not considered a good physical investment like precious metals, which hold low-tech intrinsic value. Rare Earth Metals and Their Applications . In the periodic table of the elements, the third column lists the rare earth elements. The third row of the third column is expanded below the chart, listing the lanthanide series ...
Differential Fractionation of Rare Earth Elements in ...
Heavy rare earth elements (Gd–Lu & Y, abbreviated as HREEs) are essential to produce NdFeB magnets, be-cause Dy and Tb of the HREEs are impregnated in the magnets to improve their heat resistance (Minowa, 2008). The widespread application of such heat resistive permanent magnets to factory auto-machinery, hybrid and electric vehicles, wind ...
Accumulation and fractionation of rare earth elements ...
Previous studies on rare earth element (REE) bioaccumulation have focused on their accumulation rate and fractionation, but the processes involved remain unclear. In this study, the accumulation and fractionation of REEs in wheat ( Triticum aestivum L.) were investigated using solution culture with exogenous mixed REEs.
High field strength element/rare earth element ...
In contrast, the heavy rare earth element partition coefficients D HREE are hardly affected by a change in garnet Ca content. We provide a semiquantitative explanation for the behavior of the high field strength elements based on a crystal lattice strain model in which Zr and Hf are split between the X and Y sites in Ca-rich garnet and in which ...
Heating events in the nascent solar system recorded by ...
Equilibrium condensation of solar gas is often invoked to explain the abundance of refractory elements in planets and meteorites. This is partly motivated, by the observation that the depletions in both the least and most refractory rare earth elements (REEs) in meteoritic group II calcium-aluminum–rich inclusions (CAIs) can be reproduced by thermodynamic models of solar nebula condensation.
Rare earth element fractionation in magmatic Ca-rich ...
Igneous garnets have the potential to strongly fractionate rare earth elements (REE). Yet informations on partition coefficients are very scant, and criteria for distinguishing between hydrothermal and magmatic garnets are ambiguous. To fill this gap, we present trace element and isotopic data for two types of Ca-rich garnets from phonolites (Mt. Somma-Vesuvius). Both Ca-garnet populations are ...
Rare earth element fractionation and concentration ...
@article{osti_20000932, title = {Rare earth element fractionation and concentration variations along a groundwater flow path within a shallow, basin-fill aquifer, southern Nevada, USA}, author = {Johannesson, K H and Farnham, I M and Guo, C and Stetzenbach, K J}, abstractNote = {Rare earth element (REE) concentrations were measured in 5 well water samples and 3 springs located …
Rare-earth element fractionation in uranium ore and its U ...
Rare-earth element fractionation in uranium ore and its U(VI) alteration minerals Enrica Balbonia,b,∗, Antonio Simonettia, Tyler Spanoa, Nathaniel D. Cooka, Peter C. Burnsa,c a Department of Civil and Environmental Engineering and Earth Science, University of Notre Dame, Notre Dame, IN …
Mobility and fractionation of rare earth elements in ...
mobility of rare earth elements ( REEs) in the porewater col- umn below the sediment-water interface (e.g., ELDERFIELD and SHOLKOVITZ, 1987) to the sequence of phyllosilicate reconstitution during burial (e.g., KISCH, 1983), and even- tually to recrystallization of major and accessory phases re-
(PDF) Geochemical fractionation of rare earth elements in ...
Based on the concentration and distribution pattern analysis of the rare earth elements (REEs) at the Shell Bar section from Qaidam Basin, we studied the geochemical fractionations of REE in ...
Controls on the distribution and fractionation of yttrium ...
The rare-earth elements (REE), La to Lu, are widely used as tracers of geochemical processes in a wide variety of sedimentary environments. REE are useful for determining petrogenetic histories of rocks (Shields and Stille, 2001). Several investigators reported dissolved and particulate REE in fluvial
Interoceanic variation in the rare earth, major, and trace ...
Rare earth element (REE), major, and trace element abundances and relative fractionations in forty nodular cherts sampled by the Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) indicate that the REE composition of chert records the interplay between terrigenous sources and scavenging from the local seawater. Major and (non-REE) trace element ratios indicate that the ...
Rare earth element fractionations of the northwestern ...
Rare earth elements (REEs) fractionations in siliciclastic marine sediments are related to the parent rock properties, weathering degree, grain size, and heavy minerals. The relations between marine sediment REE compositions and regional paleoclimate are not fully understood.
Role of ligands in accumulation and fractionation of rare ...
Few studies have been carried out on the effects of ligands on rare earth element (REE) bioaccumulation processes. In this study, the effects of phosphate (Pi, an inorganic ligand) and citrate (an organic ligand) on accumulation and fractionation of REEs in wheat were investigated using aqueous culture with extraneous mixed REEs (MRE).
Rare-earth element - Wikipedia
The rare-earth elements, also called the rare-earth metals or (in context) rare-earth oxides, or the lanthanides (though yttrium and scandium are usually included as rare-earths) are a set of 17 nearly-indistinguishable lustrous silvery-white soft heavy metals. Scandium and yttrium are considered rare-earth elements because they tend to occur in the same ore deposits as the lanthanides and ...
Rare Earth Element Accumulation and Fractionation in a ...
Rare earth elements (REEs) are a natural resource of vital economic interest. While REE mining and processing are known for severe environmental issues, REEs are also by-products of other mining processes (e.g. uranium). Here, we provide an in-depth assessment of REE distribution across a lake system impacted by adjacent uranium mining over a long period (Bow Lake, Ontario, Canada). …
RARE EARTH ELEMENT DISTRIBUTION PATTERNS IN THE …
fractionations from Low REE to High REE. The overall fractionation of the REEs for earth soil is depicted by the slope of the (REE) cn plot by the (La/Lu) cn in ratio. The REE plots obtained showed enrichment of (LREE) cn as against the (HREE) cn, which is the usual trend for all geological matrices.
Rare Earth Elements Fractionation in Native Vegetation ...
A review of fractionations of rare earth elements in plants. J Rare Earths, 26 (2008), pp. 7-15. Article Download PDF View Record in Scopus Google Scholar. Y.G. Wang, J.X. Sun, H.M. Chen, F.Q. Guo. Determination of the contents and distribution characteristics of REE in natural plants by NAA.
Revisit of rare earth element fractionation during ...
Although rare earth element (REE) has been widely applied for provenance study and paleoenvironmental reconstruction, its mobility and fractionation during earth surface processes from weathering to sediment deposition remain more clarification. We investigated the REE fractionations during chemical weathering and river sediment transport based on the systematic observations from a ...
Accumulation and fractionation of rare earth elements ...
Previous studies on rare earth element (REE) bioaccumulation have focused on their accumulation rate and fractionation, but the processes involved remain unclear. In this study, the accumulation and fractionation of REEs in wheat (Triticum aestivum L.) were investigated using solution culture with e …
(PDF) Rare earth element fractionations of the ...
Rare earth elements (REEs) fractionations in siliciclastic marine sediments are related to the parent rock properties, weathering degree, grain size, and heavy minerals.
Fractionation of Rare Earth Elements in Greisen and ...
This study focuses on concentrations and fractionation of rare earth elements (REE) in a variety of minerals and bulk materials of hydrothermal greisen and vein mineralization in Paleoproterozoic monzodiorite to granodiorite related to the intrusion of Mesoproterozoic alkali- and fluorine-rich granite. The greisen consists of coarse-grained quartz, muscovite, and fluorite, whereas …
Enrichment and Fractionation of Rare Earth Elements in an ...
This paper provides new insights into the geochemical cycling of rare earth elements (REEs) in acid sulfate soils developed on salt marsh sediments of the Huelva estuary (Spain) as a result of sulfide mineral oxidation in abandoned ore stockpiles. The study was aimed at determining the REE abundance, fractionation pattern and mineralogical control of the dispersal and retention of REEs in the ...
Rare Earth Element and Trace Element Features of Gold ...
These are obvious LREE fractionations. The rare earth element (REE) distribution patterns show obvious Eu anomaly with average δEu values of 0.664, and δCe anomalies of 1.044. REE characteristics are similar to those of wall rocks (regional metamorphic rocks), but different from those of the Dexing granodiorite porphyry and Damaoshan biotite ...
DOE Awards $19 Million for Initiatives to Produce Rare ...
WASHINGTON, D.C. — The U.S. Department of Energy (DOE) today awarded $19 million for 13 projects in traditionally fossil fuel-producing communities across the country to support production of rare earth elements and critical minerals vital to the manufacturing of batteries, magnets, and other components important to the clean energy economy.. Facing persistent shortages in …
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Fractionation of rare earth elements within bone mineral: a natural cation exchange system. Fractionation of potentially toxic elements in urban soils from five European cities by means of a harmonised sequential extraction procedure
