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Oct 29, 2021· The REE concentrations and fractionations of SPM in river water mainly depend on lithologic distribution and riverine pH, while they are affected by salinity in the estuary. ... Background: In the river system, the geochemistry of rare earth elements (REEs, a series of elements from La to Lu) in suspended particulate matter (SPM) is generally ...
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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 fra …
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Aug 30, 2005· The rare earth elements (REEs) comprise a group of 17 trivalent metallic elements with similar chemical properties. They vary in relative atomic mass from 139 (lanthanum) to 175 (lutetium). ... Fractionations of REEs in biogeochemical processes have been observed, for example, fractionation between light REEs (LREEs, La–Eu) and …
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Jun 24, 2022· The rare earth elements and yttrium (REY) in bioapatite from deep-sea sediments are potential proxies for reconstructing paleoenvironmental conditions. However, the REY enrichment mechanism and the reliability of this tracer remain elusive because of the lack of key information from ambient pore water. Here, we report high-resolution ...
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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 …
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A review of fractionations of rare earth elements in ... 1/2/2008 LIANG Tetal.,A review of fractionations of rare earth elements in plants 15 [58] Ding S M, Liang T, Yan J C, Zhang Z L, Sun Q. Effects of organic ligands on accumulation and fractionation of rare earth elements REEs in wheat. Acta Ecologica Sinica, 2005,25(11): 2888. [59]
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Investigations into REE speciation in roots and in the xylem sap using X-ray absorption spectroscopy and nanometer-sized TiO2 adsorption techniques demonstrated that REE fractionations should be dominated by fixation mechanism in roots caused by cell wall absorption and phosphate precipitation. Fractionations of rare earth elements (REEs) …
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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. Here, the REEs for detrital components of a core retrieved from the …
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DOI: 10.1007/s11427-007-2040-7 Corpus ID: 21808437; Fractionations of rare earth elements in plants and their conceptive model @article{Ding2007FractionationsOR, title={Fractionations of rare earth elements in plants and their conceptive model}, author={Shiming Ding and Tao Liang and Juncai Yan and Zili Zhang and Ze-chun Huang …
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Oct 29, 2021· Abstract. Background: In the river system, the geochemistry of rare earth elements (REEs, a series of elements from La to Lu) in suspended particulate matter (SPM) is generally controlled by rock weathering processes and hydrochemical characteristics, as well as being affected by anthropogenic activities. However, the variations of …
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researchers have obtained excellent data on rare-earth-element (REE) abundances and their patterns in CAIs, whereas analyses of non-REE refractory elements have been scarce, especially data for Nb and Ta, two elements considered to display minimal amounts of fractionation. However, Kornacki and Fegley (1986) and Munker et. al.
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Rare earth element patterns of plutonic rocks (chondrite- normolized) across the Peninsular Ranges batholith vary systematically west to east, transverse to the long axis and structural trends and parallel to known asymmetries in petrologic, geochronologic, and Sr isotopic properties. The abundant tonolites in the western region are characterized by slight light …
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Feb 01, 2008· The characteristics of REE fractionations in plants can be used to "trace" the pathway of REE transportation from soils (solution) to plants. A better understanding of the mechanisms of REE fractionations was helpful to investigate the controlling factors, including both the internal and the external ones.
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Abstract 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. Here, the REEs for detrital components of a core retrieved from the …
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Jun 28, 2021· Purpose The geochemistry of rare earth elements (REEs, La to Lu) in suspended sediments (SS) is generally controlled by weathering processes and the water environment. Although the concentrations and fractionations of REEs in SS have been reported in the Zhujiang River, China, their variations and controlling factors have not …
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Following NASC normalization, the fractionations of REEs, as represented by LREE/HREE; Ce and Eu anomalies; and (La/Yb) N, (La/Sm) N, and (Gd/Yb) N, were calculated. ... Rare earth elements (REE) and yttrium in stream waters, stream sediments, and Fe–Mn oxyhydroxides: fractionation, speciation, and controls over REE + Y patterns …
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