• Comprehensive Understandings of Rare Earth Element (REE ...

    Mar 26, 2019  Speciation transformation of rare earth elements (REEs) during heating and implications for REE behaviors during coal combustion. International Journal of Coal Geology 2020, 219, 103371. DOI: 10.1016/j.coal.2019.103371. W. Crawford Elliott. Regolith-hosted rare-earth elements: The phyllosilicate connection.

  • Cited by: 6
  • Distribution and speciation of rare earth elements in coal ...

    @article{osti_1478326, title = {Distribution and speciation of rare earth elements in coal combustion by-products via synchrotron microscopy and spectroscopy}, author = {Stuckman, Mengling Y. and Lopano, Christina L. and Granite, Evan J.}, abstractNote = {Rare earth element (REE) binding environments and associated mineral phases in coal and coal combustion byproducts (CCBs) are not well ...

  • Chemical speciation of scandium and yttrium in laterites ...

    The geochemistry of Sc is unique compared with other rare earth elements (REE), however, the controlling factors on their different partitioning behaviors are still poorly understood. In this study, the distribution and speciation of Sc and yttrium (Y) in the Philippine nickel (Ni) laterites were determined by a combination of sequential ...

  • Comprehensive Understandings of Rare Earth Element (REE ...

    Comprehensive Understandings of Rare Earth Element (REE) Speciation in Coal Fly Ashes and Implication for REE Extractability Pan Liu, Rixiang Huang, and Yuanzhi Tang* School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Dr., Atlanta, Georgia 30332-0340, United States * S Supporting Information

  • Rare Earth Elements in Mineral Deposits: Speciation in ...

    Studying the speciation and mineral-fluid partitioning of the rare earth elements (REE) allows us to delineate the key processes responsible for the formation of economic REE mineral deposits in natural systems. Hydrothermal REE-bearing calcite is typically hosted in carbonatites and alkaline rocks, such as the giant Bayan Obo REE deposit in China and potential REE deposits such as Bear Lodge, WY.

  • Cited by: 6
  • Rare Earth Element Speciation in Geothermal Fluids from ...

    1. Introduction. There has been much discussion over the extent to which speciation of the rare earth elements (commonly abbreviated as REE and also known as the lanthanides) controls their concentrations in the hydrosphere and over which anionic species or complexes may be important (e.g., Brookins 1989; Haas et al 1995; Wood 1990a; Wood 1990b) and references therein).

  • Cited by: 122
  • REE Publications Old netl.doe.gov

    Elucidating Distribution and Speciation of Rare Earth Elements in Coal Utilization By-Products Utilizing Synchrotron Microscopy and Spectroscopy. 34th International Pittsburgh Coal Conference (Pittsburgh, PA) 2017/09: Ward Burgess, Murphy Keller, Elliot Roth, Jonathan Lekse, Bret Howard, and Evan Granite

  • Recovery of Rare Earth Elements and Yttrium from Passive ...

    Rare earth elements and yttrium (REY) are raw materials of increasing importance for modern technologies, and finding new sources has become a pressing need. Acid mine drainage (AMD) is commonly considered an environmental pollution issue. However, REY concentrations in AMD can be several orders of magnitude higher than in naturally occurring water bodies.

  • Chemical speciation and bioavailability of rare earth ...

    Oct 10, 2016  Rare earths (RE), chemically uniform group of elements due to similar physicochemical behavior, are termed as lanthanides. Natural occurrence depends on the geological circumstances and has been of long interest for geologist as tools for further scientific research into the region of ores, rocks, and oceanic water. The review paper mainly focuses to provide scientific literature about rare ...

  • Rare earth elements in soil and plant systems - A review ...

    Wang Z W, Shan X Q and Zhang S Z 2001a Comparison of speciation and bioavailability of rare earth elements between wet rhizophere soil and air-dried bulk soil.

  • Chemical speciation and bioavailability of rare earth ...

    The review paper mainly focuses to provide scientific literature about rare earth elements (REEs) with potential environmental and health effects in understanding the research. This is the initial review of RE speciation and bioavailability with current initiative toward development needs and research perceptive.

  • Speciation and transport of REE in Passive Treatment ...

    The PhD project proposed by SCK CEN within the frame of the PANORAMA project (a Marie Curie Innovative Training Network) aims at studying the speciation and transport of Rare Earth Elements (REE) in Passive Treatment Systems (PTS) of the Iberian Pyrite Belt.

  • (PDF) Rare earth element concentrations and speciation in ...

    Rare earth element concentrations and speciation in alkaline lakes from the western USA Article (PDF Available) in Geophysical Research Letters 21(9):773-776 May 1994 with 202 Reads

  • Speciation of Rare‐Earth Metal Complexes in Ionic Liquids ...

    Nicolas Schaeffer, Sue Grimes, Chris Cheeseman, Interactions between trivalent rare earth oxides and mixed [Hbet][Tf2N]:H2O systems in the development of a one-step process for the separation of light from heavy rare earth elements, Inorganica Chimica Acta,

  • Heavy Metals Analysis Trace Metal Analysis

    Rare earth elements (REE) Manganese Speciation. Manganese (Mn) speciation can provide invaluable information about mobility and bioavailability, as well as determining potential treatment options. Brooks Applied Labs offers an operationally-defined method where the reduced manganese [Mn(II)] and oxidized manganese [Mn(IV)] species are ...

  • Effects of sulfate on speciation and bioavailability of ...

    Jan 12, 2015  The species of rare earth elements (REEs, La, Gd, Y) in a nutrient solution were calculated out by MINTEQA2 procedure. The results showed that the precipitation of REEs would take place when the pH was greater than 7.5. Meanwhile, the species of light (La 3+)_medium (Gd 3+) and heavy (Y 3+) REEs with SO 4 2− were calculated using MINTEQA2.

  • Recovery of Rare Earth Elements and Yttrium from Passive ...

    Rare earth elements and yttrium (REY) are raw materials of increasing importance for modern technologies, and finding new sources has become a pressing need. Acid mine drainage (AMD) is commonly considered an environmental pollution issue. However, REY concentrations in AMD can be several orders of magnitude higher than in naturally occurring water bodies.

  • Rare Earth hypothesis - Wikipedia

    The Rare Earth hypothesis argues that the evolution of biological complexity requires a host of fortuitous circumstances, such as a galactic habitable zone, a central star and planetary system having the requisite character, the circumstellar habitable zone, a right-sized terrestrial planet, the advantage of a gas giant guardian like Jupiter and a large natural satellite, conditions needed to ...

  • Chemical speciation and bioavailability of rare earth ...

    Oct 10, 2016  Rare earths (RE), chemically uniform group of elements due to similar physicochemical behavior, are termed as lanthanides. Natural occurrence depends on the geological circumstances and has been of long interest for geologist as tools for further scientific research into the region of ores, rocks, and oceanic water. The review paper mainly focuses to provide scientific literature about rare ...

  • The influence of rare earth element fertilizer application ...

    Jan 12, 2015  (2001). The influence of rare earth element fertilizer application on the distribution and bioaccumulation of rare earth elements in plants under field conditions. Chemical Speciation Bioavailability: Vol. 13, No. 2, pp. 39-48.

  • Rare Earth Elements: The Global Supply Chain

    Rare Earth Elements: The Global Supply Chain Marc Humphries Specialist in Energy Policy December 16, 2013 Congressional Research Service 7-5700 crs.gov R41347 . Rare Earth Elements: The Global Supply Chain Congressional Research Service Summary

  • Speciation of rare earth elements in soil and accumulation ...

    A greenhouse study was conducted to investigate the accumulation of rare earth elements (REEs), La, Ce, Pr and Nd, in winter wheat (Triticum aestivum L.), and the speciation of these elements in soil following the application of REE-based fertilizers. Improved crop yield was confirmed by the experiment.

  • Recent applications of rare-earth metal(III) triflates in ...

    Rare-earth metal(III) triflates are extremely mild, efficient and water-tolerable Lewis acid catalysts for a wide range of organic transformations. Rare-earth metal triflates retain activity even in the presence of multiple Lewis bases containing oxygen, nitrogen, sulfur and phosphorus atoms, and can be easily recovered and reused without any ...

  • GDR: Search

    Great Salt Lake Composition and Rare Earth Speciation Analysis. We have conducted aqueous speciation analyses of the Great Salt Lake (GSL) brine sample (Table 1) and a mock geo sample (Table 2) spiked with 1 ppb Tb and 100 ppb Tb. The GSL speciation (Figure 1) aligns with our basic speciation expectations that strong carbonate complexes would

  • Speciation of rare earth elements in soil and accumulation ...

    A greenhouse study was conducted to investigate the accumulation of rare earth elements (REEs), La, Ce, Pr and Nd, in winter wheat (Triticum aestivum L.), and the speciation of these elements in soil following the application of REE-based fertilizers. Improved crop yield was confirmed by the experiment.

  • Speciation of Rare‐Earth Metal Complexes in Ionic Liquids ...

    Nicolas Schaeffer, Sue Grimes, Chris Cheeseman, Interactions between trivalent rare earth oxides and mixed [Hbet][Tf2N]:H2O systems in the development of a one-step process for the separation of light from heavy rare earth elements, Inorganica Chimica Acta,

  • (PDF) Rare earth element concentrations and speciation in ...

    Rare earth element concentrations and speciation in alkaline lakes from the western USA Article (PDF Available) in Geophysical Research Letters 21(9):773-776 May 1994 with 202 Reads

  • Rare Earth Elements in Mineral Deposits: Speciation in ...

    Jan 01, 2018  Caption: Figure 5: Rare earth element fluid-calcite partitioning Model Ilb at 1 kbar, showing the speciation of REE in a fluid in equilibrium with REE-bearing calcite as a function of temperature and salinity (0.5 and 20 wt.% NaCl).

  • Chemical speciation and bioavailability of rare earth ...

    Rare earth elements (REEs) speciation in the geochemical samples provides potential hazards and pathways for remedi-ation. Factors like time and environmental conditions affect-ing speciation provide challenging and great opportunity for environmental science and technology to study rare earth

  • Effects of sulfate on speciation and bioavailability of ...

    Jan 12, 2015  The species of rare earth elements (REEs, La, Gd, Y) in a nutrient solution were calculated out by MINTEQA2 procedure. The results showed that the precipitation of REEs would take place when the pH was greater than 7.5. Meanwhile, the species of light (La 3+)_medium (Gd 3+) and heavy (Y 3+) REEs with SO 4 2− were calculated using MINTEQA2.

  • The influence of rare earth element fertilizer application ...

    Jan 12, 2015  (2001). The influence of rare earth element fertilizer application on the distribution and bioaccumulation of rare earth elements in plants under field conditions. Chemical Speciation Bioavailability: Vol. 13, No. 2, pp. 39-48.

  • Differences in bulk and microscale yttrium speciation in ...

    Coal combustion ash is a promising alternative source of rare earth elements (REE; herein defined as the 14 stable lanthanides, yttrium, and scandium). Efforts to extract REE from coal ash will depend heavily on the location and speciation of these elements in the ash.

  • Rare Earth Elements: The Global Supply Chain

    Rare Earth Elements: The Global Supply Chain Marc Humphries Specialist in Energy Policy December 16, 2013 Congressional Research Service 7-5700 crs.gov R41347 . Rare Earth Elements: The Global Supply Chain Congressional Research Service Summary

  • Recent applications of rare-earth metal(III) triflates in ...

    Rare-earth metal(III) triflates are extremely mild, efficient and water-tolerable Lewis acid catalysts for a wide range of organic transformations. Rare-earth metal triflates retain activity even in the presence of multiple Lewis bases containing oxygen, nitrogen, sulfur and phosphorus atoms, and can be easily recovered and reused without any ...

  • Minerals Special Issue : Speciation and Characterization ...

    Minerals, an international, peer-reviewed Open Access journal. Dear Colleagues, This special issue addresses research topics dealing with the speciation and characterization of transition metals and rare earth elements in minerals, rocks, or sediments.

  • Speciation of Rare‐Earth Metal Complexes in Ionic Liquids ...

    Jan 20, 2009  Speciation of Rare‐Earth Metal Complexes in Ionic Liquids: A Multiple‐Technique Approach. Peter Nockemann Dr. E-mail address: [email protected] Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F bus 2404, 3001 Leuven (Belgium), Fax: (+32) 16‐327992.

  • Analysis of Rare Earth Elements in Rock and Mineral ...

    AbstractThe group of the rare earth elements (REEs) serves as valuable indicator of numerous geological processes such as magma formation or fluid–rock interaction. The decay systems of the radioactive REE isotopes 138La, 147Sm and 176Lu are used for geochronometric dating of a range of events, starting from first steps of planetary formation to younger steps of geodynamic development.

  • GDR: Great Salt Lake Composition and Rare Earth Speciation ...

    We have conducted aqueous speciation analyses of the Great Salt Lake (GSL) brine sample (Table 1) and a mock geo sample (Table 2) spiked with 1 ppb Tb and 100 ppb Tb. The GSL speciation (Figure 1) aligns with our basic speciation expectations that strong carbonate complexes would form at mid to higher pH's. Although we expected strong aqueous complexes with fluorides at neutral pH and with ...

  • Speciation of Rare‐Earth Metal Complexes in Ionic Liquids ...

    Jan 20, 2009  Speciation of Rare‐Earth Metal Complexes in Ionic Liquids: A Multiple‐Technique Approach. Peter Nockemann Dr. E-mail address: [email protected] Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F bus 2404, 3001 Leuven (Belgium), Fax: (+32) 16‐327992.

  • (PDF) Comprehensive Understandings of Rare Earth Element ...

    speciation of rare earth elements in coal combustion by-products via. synchrotron microscopy and spectroscopy. Int. J. Coal Geol. 2018, 195, 125 ...

  • Rare Earth Element Speciation Along Groundwater Flow Paths ...

    Groundwater samples were collected in two different types of aquifer (i.e., Carrizo sand aquifer, Texas and Upper Floridan carbonate aquifer, west-central Florida) to study the concentrations, fractionation, and speciation of rare earth elements (REE) along groundwater flow paths in each aquifer. The solution complexation of REEs in these two aquifers was modeled using Humic Ion-Binding Model V.

  • Rare Earth Element Speciation in Geothermal Fluids from ...

    Elevated concentrations (20-1133 nmol/kg) of rare earth elements (REE) are present in acid-sulphate and acid-sulphate-chloride hydrothermal waters of the Yellowstone National Park (YNP). We used recently estimated thermodynamic data (Haas et al 1995) to speciate seventeen YNP hydrothermal fluids with the EQ3NR code. The fluids show a range in pH (2.0-4.0) and temperature (70°-93°C) and are ...

  • Chemical speciation and bioavailability of rare earth ...

    Rare earth elements (REEs) speciation in the geochemical samples provides potential hazards and pathways for remedi-ation. Factors like time and environmental conditions affect-ing speciation provide challenging and great opportunity for environmental science and technology to study rare earth

  • Minerals Special Issue : Speciation and Characterization ...

    Minerals, an international, peer-reviewed Open Access journal. Dear Colleagues, This special issue addresses research topics dealing with the speciation and characterization of transition metals and rare earth elements in minerals, rocks, or sediments.

  • The influence of rare earth element fertilizer application ...

    Jan 12, 2015  (2001). The influence of rare earth element fertilizer application on the distribution and bioaccumulation of rare earth elements in plants under field conditions. Chemical Speciation Bioavailability: Vol. 13, No. 2, pp. 39-48.

  • Differences in bulk and microscale yttrium speciation in ...

    Coal combustion ash is a promising alternative source of rare earth elements (REE; herein defined as the 14 stable lanthanides, yttrium, and scandium). Efforts to extract REE from coal ash will depend heavily on the location and speciation of these elements in the ash.

  • Aqueous Speciation Studies of Europium(III) Phosphotungstate

    imperative to understand the solution speciation chemistry and its impact on solid-state materials. In this study we find that the aqueous speciation of europium(III) and the trivacant polyoxometalate, PW9O349-, is a function of pH, countercation, and stoichiometry. For example, at low pH, the lacunary (PW11O39)7-predominates and the

  • Publications Hsu-Kim Research Group

    Rare Earth Element Distribution in Fly Ash Derived from the Fire Clay Coal, Kentucky. Coal Combustion and Gasification Products , 9, 22-33. DOI: 10.4177/CCGP-D-17-00002.1

  • Speciation of adsorbed yttrium and rare earth elements on ...

    Surface speciation of yttrium and rare earth elements on oxides 3965. variety of solids and environmental conditions that is also consistent with the results of the X-ray studies. The purpose of the present study is to establish a simple, internally consistent surface complexation model of YREE

  • Rare earth element concentrations and speciation in ...

    The rare earth element (REE) concentrations of lake water from five alkaline lakes (i.e., Mono, Walker, Abert, Summer, and Goose Lakes) within the Great Basin of the western U.S.A. are reported. ... The speciation of the REEs was determined and, in all cases, species greater than 99% of each of the REEs exist as Ln(CO 3) 2 ‐ complexes. The ...

  • A new model simulates the speciation and dispersion of ...

    Jun 10, 2020  Roshan and collaborators (2020, see references below) present new observations of dissolved iron (Fe) and its physical speciation in the South Pacific (along GEOTRACES GP16 section), and develop a new mechanistic model of hydrothermal Fe dispersion.They propose that Fe is released from hydrothermal vents as large inorganic colloids, and is gradually transformed to organic forms

  • 6 S H F LD WLR Q R I UD UH H D UWK H OH P H Q WV LQ V

    Speciation of rare earth elements in surface sediments of Lagoon of Aveiro (N Portugal) 65 is 45 km long and 10 km wide and covers an area between 66 km2 and 83 km2 at a low and high spring tide, respectively (Dias et al., 2001). It is characterized by a series of channels among intertidal