Frontiers | Cerium anomaly as a tracer for paleo-oceanic …
Reconstructing redox conditions in the paleo-ocean is essential to understand the Earth's biogeochemical evolution. Cerium (Ce) anomaly in marine sediments has been used to distinguish oxic versus anoxic depositional environments in the Paleo-ocean. Previous studies suggested that dissolved oxygen is indispensable to cerium oxidation. …
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Dissolved rare earth elements in the eastern Indian Ocean: …
Dissolved rare earth elements. The profiles of dissolved REEs in seawater are shown in Fig. 2. The data from stations PA-9 in the Bay of Bengal and PA-4 in the Southern Ocean have already been reported in Nozaki and Alibo (2003a), Nozaki and Alibo (2003b). The REE and Nd isotope data for the surface waters obtained along the cruise …
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The oceanic chemistry of the rare-earth elements
Jiang Y and Ji H (2011) Rare earth geochemistry in the dissolved, suspended and sedimentary loads in karstic rivers, Southwest China, Environmental Earth Sciences, 10.1007/s12665-011-1443-8, 66:8, (2217-2234), Online publication date: 1-Aug-2012.
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Recovery of rare earth elements from acid mine drainage: A …
Extraction of rare-earth ions from mixtures with other cations is an important part of recovering rare-earth ions from recycling or other streams. This study examines whether highly selective Donnan partitioning into a cation-exchange membrane can lead to effective electrodialysis (ED) extraction of La 3+ from solutions containing monovalent or ...
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Rare Earth Element Distributions and Trends in Natural …
Systematically varying properties and reactivities have led to focused research of the environmental forensic capabilities of rare earth elements (REE). Increasing anthropogenic inputs to natural systems may permanently alter the natural signatures of REE, motivating characterization of natural REE variability. We compiled and analyzed …
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Frontiers | Dissolved rare earth elements in the …
Frontiers | Dissolved rare earth elements in the Northwest Pacific: Sources, water mass tracing, and cross‐shelf fluxes. View article impact. ORIGINAL RESEARCH article. Front. Mar. Sci., 16 March 2023. …
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Rare earth element geochemistry characteristics of seawater …
The rare earth element (REE) is important not only in world industrial demand 1, but also in tracing various geochemical processes 2.REE is widely used for geochemical studies of estuaries, oceans ...
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Determination of rare earth elements concentrations in natural waters
Since the rare earth elements (REEs) determination in waters is still not a routine procedure, different analytical protocols have been developed to deal with complexity and variability of sample matrices, problems caused by spectral and non-spectral interferences, insufficient instruments sensitivity, potential contamination and lack of …
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Direct determination of rare earth elements in natural
Rare earth elements in the Rhine River, Germany: first case of anthropogenic lanthanum as a dissolved microcontaminant in the hydrosphere. Environ. Int. ... is a widespread beverage plant that prefers aluminum-enriched acidic soils. However, rare earth elements (REEs) might be highly phyto-available in these soils. With the increasing …
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Spatio-Temporal Distribution and Environmental …
Abstract. Rare earth elements (REE) geochemistry can reveal the environmental information of solutes in river systems because REE is sensitive to hydro …
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Extraction and complexation of trivalent rare earth …
Extraction of rare-earth ions. In all the rare-earth extraction experiments, the DGAs dissolved in 30/70 (v/v) n-octanol/kerosene as organic phase was pre-equilibrated by contacting with fresh aqueous phase of a certain concentration of HNO 3, corresponding to the extraction acidity for at least three times to guarantee a constant acidity ...
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Speciation of rare earth elements in natural terrestrial waters
The cycling of dissolved rare earth elements in Chesapeake Bay. Global Biogeochem. Cycles, 2 (1988), pp. 157-176. View in Scopus Google Scholar. Sholkovitz and Szymczak 2000. E.R. Sholkovitz, R. Szymczak. The estuarine chemistry of rare earth elements: Comparison of the Amazon, Fly, Sepik and the Gulf of Papua systems.
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Dissolved rare earth elements estimation of ion-absorption rare earth …
Ion-absorption rare earth ores are an important mineral resource in China. Nowadays, the unauthorized mining has become a serious problem, resulting in severe water pollution and the wastage of rare earth elements (REEs). Being able to estimate the concentration of dissolved REEs in water bodies near mines is essential for tackling this …
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The geochemical characteristics of aqueous rare-earth
Fifty-seven shallow groundwater samples were collected from Guiyang karst basin, China, to analyze the aqueous rare-earth elements in low-water seasons and it is shown that the total amount of rare-earth elements (ΣREE) in karst groundwater is exceedingly low compared with that in carbonate rocks or weathering crusts of carbonate …
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Frontiers | Peer Reviewed Articles
Trace elements such as the rare earth elements (REEs) can trace the sources and transport of water masses. Here we present dissolved REE concentrations along a longitudinal transect (150 o E) from 13°N to 40°N in the Northwest Pacific (≤2000 m). We divided the transect into two subregions: a mixed water region (MWR; 37~40 °N, where …
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Seawater‐Particle Interactions of Rare Earth Elements and …
In the central Arctic Ocean, dissolved rare earth element concentrations ([dREE]) and the neodymium (Nd) isotope compositions are constant throughout the deep water column (>1,000 m water depth), indicating unique conditions among the ocean basins and therefore requiring an investigation of seawater-particle interactions.
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Review of High-Temperature Recovery of Rare Earth (Nd/Dy …
Rare-earth metals, particularly neodymium, dysprosium, and praseodymium are becoming increasingly important in the transition to a green economy due to their essential role in permanent magnet applications such as in electric motors and generators. With the increasingly limited rare-earth supply and complexity of processing Nd, Dy, and …
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Dissolved rare earth elements distribution and fractionation …
Dissolved rare earth elements (REE) can reflect the environmental changes in river systems and trace the mixing processes between rivers and the ocean at the estuary. In this study, the dissolved REE concentrations were measured in the river and estuary of the Jiulong River, which supplies drinking water to about one-third of the …
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Removal of Sulfate Ions from Calcium Oxide Precipitation …
Rare earth elements have unique physical and chemical properties, and they have been widely used in magnetics, optics, and many other fields. 1 Among them, ... 0.5 g of mixed rare earth oxides was dissolved with H 2 O 2 –HCl and then diluted with water to 100 mL. The concentrations of rare earth and nonrare earth impurities in the 100 mL ...
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Rare earth elements in the Pearl River Delta of China: …
Rare earth element (REE) concentrations and patterns were measured in surface water, suspended particles (SP) and oysters from the Pearl River Estuary, China. During the rainy season of 2017, higher REE concentrations were found at the stations in the estuary (ΣREE = 0.06–0.42 μg L −1) than those at the river mouths (referred to as 'outlet' …
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Rare earth element geochemistry characteristics of …
The rare earth element (REE) is important not only in world industrial demand 1, but also in tracing various geochemical processes 2. REE is widely used for …
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Xiaoqiang LI | Postdoc | Ph.d | China University of
Dissolved rare earth elements (REE) can reflect the environmental changes in river systems and trace the mixing processes between rivers and the ocean at the estuary. In this study, the dissolved ...
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Rare Earth Element Patterns in the Karst Terrains of Guizhou …
The authors determine the concentrations of dissolved (<0.22 μm) rare earth elements (REE) and suspended particulate matter (SPM) of typical karst rivers in Guizhou Province, China during the high-flow period. The concentrations of acid-soluble REE extracted from SPM using diluted hydrochloric acid are also obtained to investigate …
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Rare earth elements and Sr and Nd isotopic compositions of dissolved …
Rare earth elements (REE) as well as Sr and Nd isotopic ratios have become most important geochemical tracers in this field of research and, today, dissolved and suspended load data are available for several major river systems (Keasler and Loveland, 1982; Goldstein et al., 1984; Stordal and Wasserburg, 1986; Goldstein and Jacobsen, …
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Rare Earth Element
1.1 Rare Earth Elements. Rare earth elements (REEs) represent the group of 17 elements comprising 15 lanthanides, plus yttrium (Y) and scandium (Sc) (Table 1 ). Among the REEs, yttrium was discovered first in 1794 by a Finish chemist, Johan Gadolin who isolated an oxide and called it "yttria," in a mineral collected from a quarry near the ...
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Review and Assessment of Organic and Inorganic Rare Earth …
The lanthanide elements, or rare earth elements (REEs), are an active research area, with increasing attention directed toward soil and water evaluation and protection. Rare earth element concentrations in surface and groundwaters may be appropriately evaluated by partitioning the REEs into (i) a dissolved fraction (REE3+, …
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Dissolved rare earth elements distribution and …
Dissolved rare earth elements (REE) can reflect the environmental changes in river systems and trace the mixing processes between rivers and the ocean at the …
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Recovering Rare Earth Elements from Aqueous Solution …
@article{osti_1433610, title = {Recovering Rare Earth Elements from Aqueous Solution with Porous Amine–Epoxy Networks}, author = {Wilfong, Walter Christopher and Kail, Brian W. and Bank, Tracy L. and Howard, Bret H. and Gray, McMahan L.}, abstractNote = {Recovering aqueous rare earth elements (REEs) from domestic …
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Rare earth elements from waste | Science Advances
Rare earth elements (REEs) are strategic resources in modern electronics, clean energy, and automotive industries ().Concentrated aqueous acid leaching of the REE minerals, followed by biphasic solvent extraction, has been the dominant scheme for REE mass production ().However, the resource- and pollution-intensive production has a large …
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Effect of cascade reservoirs on geochemical characteristics of rare …
The geochemistry of rare earth elements (REEs) in riverine suspended particle matter (SPM) is an important role in indicating rock weathering processes. However, it has been unclear whether reservoirs can cause variations of geochemical characteristics and behaviors of REEs in SPM. In the present study, the REE contents and fractionations …
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