Many "newly discovered elements" were not one element but mixtures of as many as six different rare-earth elements. Furthermore, there were claims of discovery of a large number of other "elements," …

INTRODUCTION. The rare-earth elements (REEs; La to Lu, excluding Pm) have been widely used as natural tracers in studies of regional groundwater migration and groundwater–surface water interactions. 1–8 The application of REEs as natural tracers takes advantage of their uniform trivalent charge, similar ionic radii, and within-group …

Rare earth element sequential precipitation is developed for ionic clay leachate. ... In trial IC-A (3.5×), the solution pH slowly increased from 6.86 immediately after mixing with the bicarbonate, where most of the precipitation occurred, up to 7.08 after 4 h. During this time, additional precipitation slowly occurred, likely due to the slow ...

The purpose of this paper is to describe the behaviour of the rare earth elements (REE) during this mixing process. There are both theoretical and empirical …

The only rare earth element estimated to have less than 1000 years . resource is Eu at approximately 600 years. However growth in consumption of particularly the heavy .

Complete rare earth element (except Eu) and Y concentrations from the estuarine mixing zone (salinity = 0.2 to 33) of Elimbah Creek, Queensland, Australia, …

@article{osti_1416299, title = {Rare earth element behavior during groundwater–seawater mixing along the Kona Coast of Hawaii}, author = {Johannesson, Karen H. and Palmore, C. Dianne and Fackrell, Joseph and Prouty, Nancy G. and Swarzenski, Peter W. and Chevis, Darren A. and Telfeyan, Katherine and White, …

101 Second St., Suite 110. Petaluma, CA 94952. Tel.: (707) 981-8999. Fax: (707) 981-8998. Email: jluther@streetwisereports. There is no single rare earth element market. Instead, the rare ...

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The rare earth element (REE) pollution in the hydrosphere has become a matter of serious concern lately. In this study, using inductively coupled plasma mass spectrometry, the REE contents in soft tissue, byssus and shell liquor of the mussel Mytilus galloprovincialis, as a potential REE pollution bioindicator, in the Black Sea were …

Abstract. The first data on the concentrations of dissolved REE in surface waters collected from the north passage of the Changjiang Estuary where the salinity ranges from 0.15 to …

For every ton of rare earth produced, the mining process yields 13kg of dust, 9,600-12,000 cubic meters of waste gas, 75 cubic meters of wastewater, and one ton of radioactive residue. This stems from the fact that rare earth element ores have metals that, when mixed with leaching pond chemicals, contaminate air, water, and soil.

Although the behavior of high field strength elements such as the rare earth elements and yttrium (REY) has been intensively studied in tropical, temperate and boreal estuaries, little is known about arctic estuarine mixing of glacial-fed river waters that are poor in organic nanoparticles and colloids (NPCs), but rich in inorganic NPCs. Here ...

5. Johannesson KH, Stetzenbch KJ, Hodge VF, Rare earth elements as geochemical tracers of regional groundwater mixing. Geochim Cosmochim Acta 1997; 61: 3605-3618. 6. Ojiambo SB, Lyons WB, Welch KA, Poreda RJ, Johannesson KH. Strontium isotopes and rare earth elements as tracers of groundwater-lake water interactions, …

The rare earth elements (REE) are a coherent group of elements that have been used extensively to trace low-temperature geological and biogeochemical processes in a range of rocks, soils, sediments, and aquatic environments, ... source mixing, and river transport. Thus, our finding provides new recognition on the indication of Ce anomaly for ...

Rare-earth element - Minerals, Ores, Uses: The content of the individual rare-earth elements varies considerably from mineral to mineral and from deposit to deposit. The minerals and ores are generally classified as "light" or "heavy"; in the former group most of the elements present are the light-atomic-weight elements (i.e., lanthanum, cerium, …

The first data on the concentrations of dissolved REE in surface waters collected from the north passage of the Changjiang Estuary where the salinity ranges from 0.15 to 19 mglg were determined by ICP-MS after preconcentration with solvent extraction and back-extraction techniques. Relative to other estuaries, the river-water end-member …

Rare earth elements (REEs) and Yttrium (Y) are commonly used as tracers of estuarine and oceanic mixing. The lanthanide series and yttrium are usually referred …

The specific objectives of this study are to: (1) use major ion chemistry to identify and characterize different water types, mixing processes, and water-rock interactions in the aquifers; (2) test the use of trace and rare earth elements as natural tracers for characterizing underground flow connectivity and identifying contaminant …

1. Introduction In the ocean, rare earth elements (REE) and isotopic compositions of neodymium (Nd) are key parameters in understanding …

Rare Earth Elements Geochemistry and Nd Isotopes in the Mississippi River and Gulf of Mexico Mixing Zone Segun B. Adebayo 1* Minming Cui 1 Travis Hong …

As the demand for rare earth elements increases world-wide, so too do the mining activities associated with rare earth element extraction. Rare earth elements are listed as 15 elements on the periodic table comprising what is known as the lanthanide series, ranging in atomic number from 57 (lanthanum) to 71 (lutetium), as well as …

To reach them, Japan must figure out how to mix and pump mud from the deep. ... researchers identified large reserves of rare-earth elements in Japanese muds found at depths of roughly 6,000m ...

Behavior of rare earth elements in groundwater during flow and mixing in fractured rock aquifers: An example from the Dandenong Ranges, southeast Australia. Author links open overlay panel S.O. Tweed a b 2, T.R. Weaver a 1, I. Cartwright b 2, B. Schaefer b 2. ... Rare earth element (REE) analysis is effective for tracing water–rock ...

In geologic systems, the rare earth elements (REEs) La to Lu are ubiquitous, naturally occurring, and exist as stable or long-lived isotopes. REEs behave non-conservatively in most low-temperature aqueous systems. ... (Ca + Mg)/Na ratios highlight mixing with sedimentary groundwater at 2 and 4 in the basalt aquifer (circled), ...

The presented results clearly show that the addition of selected rare earth elements (La, Nd, Eu) strongly influence each electrochemical feature of the NMC622 material changed by the destructive effect of the cation mixing phenomenon, starting with the first-cycling efficiency and initial discharge capacity (Fig. S2, Table 2), through rate ...

Abstract. Complete rare earth element (except Eu) and Y concentrations from the estuarine mixing zone (salinity = 0.2 to 33) of Elimbah Creek, Queensland, Australia, were measured by quadrupole ...

Distributions of dissolved and particulate rare earth elements (REEs) and seawater neodymium isotopic composition (ε Nd) were established in samples from the BONUS GoodHope (BGH) IPY-GEOTRACES cruise in the SE Atlantic sector of the Southern Ocean (36°S-13°E to 57°S-0°, Feb.–Mar. 2008).Close to the South African …

The basic principles behind the application of rare earth elements (REE) and neodymium (Nd) isotopes as tracers for provenance studies and the evolution of the continental crust were set out by the end of the 1980s. At that time, several large-scale investigations had already documented their distribution in natural waters, sediments and …

Distributions of dissolved and particulate rare earth elements (REEs) and seawater neodymium isotopic composition (ε Nd) were established in samples from the BONUS GoodHope (BGH) IPY-GEOTRACES cruise in the SE Atlantic sector of the Southern Ocean (36°S-13°E to 57°S-0°, Feb.–Mar. 2008). Close to the South African …