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rare earth speciation

Chemical speciation and bioavailability of rare earth ...

Mining is an activity that will change the distribution and chemical speciation of rare earth elements (REEs), thus posing a serious threat to the natural environment. However, the distribution and chemical speciation of REEs in ion–adsorption …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 of rare earth elements in surface sediments of ...

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 …Speciation of Rare‐Earth Metal Complexes in Ionic Liquids ...2009-1-20 · These rare-earth complexes are well soluble in the ionic liquids [Hbet][Tf 2 N] and [C 4 mim][Tf 2 N] (C 4 mim=1-butyl-3-methylimidazolium). The speciation of the metal complexes after dissolution in these ionic liquids was investigated by luminescence spectroscopy, 1 H, 13 C, ...

Speciation of rare earth elements in soil by sequential ...

2020-11-17 · Reagents. Rare-earth oxides (yttrium and the lanthanides), purity > 99.9999%, were obtained from the Changchun Institute of Ap-plied Chemistry of Chinese Academy of Sciences. REE standard solutions (1 mg L–1) were prepared by dissolving an appropriate amount of the rare-earth oxide, which had been ignited at 850°C for 4 h, in 7 mol L–1HNOSpeciation of yttrium and the rare earth elements in ...2021-12-5 · In this context, complexation of the rare earth elements is among the most comprehensively studied (Byrne and Sholkovitz, 1996). Speciation modeling involves the measurement of equilibrium constants for the formation of individual complexes under a wide range of conditions, which relies on the ability to rapidly and routinely determine trace ...

Rare Earth Element Speciation in Geothermal Fluids from ...

1998-2-1 · 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 …Rare Earth Elements in Mineral Deposits: Speciation in ...2018-5-8 · 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 …

Speciation of rare earth elements in surface sediments of ...

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 …Speciation of Rare‐Earth Metal Complexes in Ionic Liquids ...2009-1-20 · The speciation of the metal complexes after dissolution in these ionic liquids was investigated by luminescence spectroscopy, 1 H, 13 C, and 89 Y NMR spectroscopy, and by the synchrotron techniques EXAFS (extended X-ray absorption fine structure) and HEXS (high-energy X-ray scattering). The combination of these complementary analytical ...

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2018-5-2 · Speciation of rare earth elements in soil by sequential extraction then HPLC coupled with visible and ICP-MS detection, Wang QQ, Huang BL, Guan ZW, Yang LM, Li B,Fresenius Journal of Analytical Chemistry, 2001, 370(8): 1041 …Oxygenation of the Mesoproterozoic ... - Nature Geoscience2018-4-23 · Here we present rare earth element, iron-speciation and inorganic carbon isotope data to investigate the redox evolution of the 1,600–1,550 Ma Yanliao Basin, North China Craton.

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

2009-1-20 · 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.Rare earth elements speciation by PHREEQC?2022-2-4 · Rare earth elements speciation by PHREEQC? ... Hello, your best bet for rare earth elements is to use the LLNL database with PHREEQC, and/or to recalculate that data into whichever database you ...

Rare earth elements speciation by PHREEQC?

2022-2-4 · Rare earth elements speciation by PHREEQC? ... Hello, your best bet for rare earth elements is to use the LLNL database with PHREEQC, and/or to recalculate that data into whichever database you ...Speciation of adsorbed yttrium and rare earth elements …2011-7-21 · 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

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 experim …Speciation of rare earth elements in soil by sequential ...2020-11-17 · Reagents. Rare-earth oxides (yttrium and the lanthanides), purity > 99.9999%, were obtained from the Changchun Institute of Ap-plied Chemistry of Chinese Academy of Sciences. REE standard solutions (1 mg L–1) were prepared by dissolving an appropriate amount of the rare-earth oxide, which had been ignited at 850°C for 4 h, in 7 mol L–1HNO

[PDF] Speciation transformation of rare earth elements ...

2020-2-15 · Speciation transformation of rare earth elements (REEs) during heating and implications for REE behaviors during coal combustion @article{Liu2020SpeciationTO, title={Speciation transformation of rare earth elements (REEs) during heating and implications for REE behaviors during coal combustion}, author={Pan Liu and Lufeng Yang and Qikun Wang ...Speciation of rare earth elements in soil by sequential ...2001-10-5 · The distribution of rare earth elements (REE) in a pooled soil sample collected from Zhangzhou, Fujian Province, China, was screened by a five-step sequential extraction procedure coupled with ICP-MS determination after preconcentration of REE and removal of the matrix by extraction with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (HPMBP). The results showed that …

A study of rare earth ion-adsorption clays: The speciation ...

2021-2-1 · 1. Introduction. Rare earth elements (REEs) consist of 17 metallic elements, including 15 lanthanides from lanthanum through lutetium (La Lu), as well as scandium and yttrium due to their similar chemical properties. REEs are best known as "the vitamins of modern industry", and play critical roles in many industries, such as aerospace and defense, healthcare, clean …Speciation of rare earth elements in acid mine drainage ...2021-7-1 · This work included the determination of particle size, size distribution, morphology, mineralogy, chemical speciation, and rare earth content. While the particle characteristics and mineralogy varied considerably from site to site, sequential extraction tests showed that the largest portion of REEs (45% to 75%) were found in soluble phases ...

Rare earth element concentrations and speciation in ...

1994-5-1 · 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. All of the lakes exhibit HREE-enriched shale-normalized patterns.Rare Earth Element Concentrations, Speciation, and ...Abstract. Groundwater samples were collected in two different types of aquifers (i.e., Carrizo sand aquifer, Texas and Upper Floridan carbonate aquifer, west-central Florida) to study the concentration, speciation, and fractionation of rare earth elements (REE) along the groundwater flow path in each system.

Comprehensive Understandings of Rare Earth Element …

2019-1-2 · 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 InformationParametric study and speciation analysis of rare earth ...2021-12-24 · Parametric study and speciation analysis of rare earth precipitation using oxalic acid in a chloride solution Minerals Engineering ( IF 4.765) Pub Date : 2021-12-23, DOI: 10.1016/j.mineng.2021 Ahmad Nawab, Xinbo Yang, Rick Honaker

A study of rare earth ion-adsorption clays: The speciation ...

2021-2-1 · DOI: 10.1016/j.clay.2020.105920 Corpus ID: 228993137; A study of rare earth ion-adsorption clays: The speciation of rare earth elements on kaolinite at basic pH @article{Feng2021ASO, title={A study of rare earth ion-adsorption clays: The speciation of rare earth elements on kaolinite at basic pH}, author={Xu Feng and Oznur Onel and McAlister …Assessing anthropogenic levels, speciation, and potential ...2016-9-27 · A study was carried out to determine the level of rare earth elements (REEs) in water and sediment samples from ex-mining lakes and River in Kinta Valley, Perak, Malaysia. Surface water and sediments from an ex-mining lake and Kinta River water samples were analyzed for REEs by inductively coupled plasma mass spectrometry. The total concentration of REEs in …

Chemical speciation and complexation modeling of trace …

2020-5-19 · Chemical speciation; trace and rare earth elements; mineral species; under saturation; rare earth minerals; saturation indexes 1. Introduction There is considerable interest in using trace and rare earth elements as tracers of geochemical pro-cesses. Rare earth elements in solution primarily exist as complexes with halides, sulphate, phos-Assessing anthropogenic levels, speciation, and potential ...2016-9-27 · A study was carried out to determine the level of rare earth elements (REEs) in water and sediment samples from ex-mining lakes and River in Kinta Valley, Perak, Malaysia. Surface water and sediments from an ex-mining lake and Kinta River water samples were analyzed for REEs by inductively coupled plasma mass spectrometry. The total concentration of REEs in …

Speciation of rare earth elements in soil by sequential ...

2001-10-5 · The distribution of rare earth elements (REE) in a pooled soil sample collected from Zhangzhou, Fujian Province, China, was screened by a five-step sequential extraction procedure coupled with ICP-MS determination after preconcentration of REE and removal of the matrix by extraction with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (HPMBP). The results showed that …[PDF] Speciation transformation of rare earth elements ...2020-2-15 · Speciation transformation of rare earth elements (REEs) during heating and implications for REE behaviors during coal combustion @article{Liu2020SpeciationTO, title={Speciation transformation of rare earth elements (REEs) during heating and implications for REE behaviors during coal combustion}, author={Pan Liu and Lufeng Yang and Qikun Wang ...

Chemical speciation and bioavailability of rare earth ...

2016-10-10 · Speciation of rare earth elements (REEs) in lateritic profiles from Southern China was also conducted. Mobilization of rare earth elements (REEs) during weathering processes is also well recognized, but less data was found on REEs speciation in weathering profiles (Naji et al. 2011; Aiju et al. 2012). Data analysis describes fractionation ...Rare Earth Elements in Mineral Deposits: Speciation in ...2019-7-30 · ResearchArticle Rare Earth Elements in Mineral Deposits: Speciation in Hydrothermal Fluids and Partitioning in Calcite EmilyP.Perry andAlexanderP.Gysi

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

The rare-earth element (REE) concentrations of the acidic, fresh waters of Colour Lake were analyzed, along with the major solute chemistry, in order to …Speciation of rare earth elements in soil by sequential ...Speciation of rare earth elements in soil by sequential extraction then HPLC coupled with visible and ICP–MS detection. Qiuquan Wang 1, B. Huang 1, Zhenwei Guan 1, Limin Yang 1 & Bin Li 1 Fresenius'' Journal of Analytical Chemistry volume 370, pages 1041–1047 (2001)Cite this article

Chemical speciation and bioavailability of rare earth ...

2016-10-10 · Speciation of rare earth elements (REEs) in lateritic profiles from Southern China was also conducted. Mobilization of rare earth elements (REEs) during weathering processes is also well recognized, but less data was found on REEs speciation in weathering profiles (Naji et al. 2011; Aiju et al. 2012). Data analysis describes fractionation ...(PDF) Rare earth element concentrations and speciation in ...The rare-earth element (REE) concentrations of the acidic, fresh waters of Colour Lake were analyzed, along with the major solute chemistry, in order to …

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

2019-7-30 · ResearchArticle Rare Earth Elements in Mineral Deposits: Speciation in Hydrothermal Fluids and Partitioning in Calcite EmilyP.Perry andAlexanderP.GysiRare earth element concentrations and speciation in ...1994-5-1 · 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. All of the lakes exhibit HREE-enriched shale-normalized patterns.

[PDF] Speciation transformation of rare earth elements ...

2020-2-15 · Speciation transformation of rare earth elements (REEs) during heating and implications for REE behaviors during coal combustion @article{Liu2020SpeciationTO, title={Speciation transformation of rare earth elements (REEs) during heating and implications for REE behaviors during coal combustion}, author={Pan Liu and Lufeng Yang and Qikun Wang ...Distribution and speciation of rare earth elements in coal ...2018-6-5 · Underclay, the layer of stratum beneath a coal bed, are being explored as a potential mining source of rare earth elements (REE). This study utilized micro-X-Ray fluorescence (µXRF) and micro X-Ray near edge structure (µXANES) to characterize the Ce speciation and REE distribution from four underclay samples (total REE content: 250-450 ppm) from clay deposits …

Chemical speciation and complexation modeling of trace …

2020-5-19 · Chemical speciation; trace and rare earth elements; mineral species; under saturation; rare earth minerals; saturation indexes 1. Introduction There is considerable interest in using trace and rare earth elements as tracers of geochemical pro-cesses. Rare earth elements in solution primarily exist as complexes with halides, sulphate, phos-A study of rare earth ion-adsorption clays: The speciation …2020-11-12 · A study of rare earth ion-adsorption clays: The speciation of rare earth elements on kaolinite at basic Applied Clay Science ( IF 5.467) Pub Date : 2020-11-12, DOI: 10.1016/j.clay.2020.105920 Xu Feng, Oznur Onel, McAlister Council-Troche, Noble, Roe-Hoan Yoon, John R. Morris

Rare earth elements speciation by PHREEQC?

2022-2-4 · Rare earth elements speciation by PHREEQC? ... Hello, your best bet for rare earth elements is to use the LLNL database with PHREEQC, and/or to recalculate that data into whichever database you ...A study of rare earth ion-adsorption clays: The speciation …2020-11-12 · A study of rare earth ion-adsorption clays: The speciation of rare earth elements on kaolinite at basic Applied Clay Science ( IF 5.467) Pub Date : 2020-11-12, DOI: 10.1016/j.clay.2020.105920 Xu Feng, Oznur Onel, McAlister Council-Troche, Noble, Roe-Hoan Yoon, John R. Morris