The correlation relationships in the concentrations of rare earth elements are shown in Fig. 2f. In the case of determining the concentrations of elements with medium lives, such as La and Sm, calculating the concentration of La is enough to predict the concentration of Sm through machine learning models.

Open Access Article. Notes on the Potential for the Concentration of Rare Earth Elements and Yttrium in Coal Combustion Fly Ash. by. James C. Hower. 1,*, John G. Groppo. 1, Kevin R. Henke. 1, …

An in-depth investigation was carried out on the recovery of rare earth elements (REEs) from a variety of waste printed circuit boards (PCBs). ... Concentration of rare earth elements during high temperature pyrolysis of waste printed circuit boards Waste Manag. 2018 Aug;78:602-610. doi: 10.1016/j.wasman.2018.06.041.

Publiekssamenvatting. In this report maximum permissible concentrations (MPCs) and negligible concentrations (NCs) are derived for Rare Earth Elements (REEs), which are also known as lanthanides. The REEs selected for derivation of environmental risk limits in this report are Yttrium (Y), Lanthanum (La), Cerium (Ce), Praseodymium (Pr ...

Rare-earth element - Abundance, Occurrence, Reserves: As noted above, the rare earths are fairly abundant, but their availability is somewhat limited, primarily because their …

[1] Three vertical profiles of rare earth element concentrations and Nd isotopic compositions have been measured in the remote southeast Pacific Ocean. The three stations represent …

Rare earth elements (REE) include the lanthanide series elements (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) plus Sc and Y. Currently these metals have become very critical to several modern technologies ranging from cell phones and televisions to LED light bulbs and wind turbines.

Rare Earth Elements (REEs) are primarily formed through various geological processes that involve the differentiation and fractionation of magmas and hydrothermal fluids. These processes result in the concentration of REEs in specific geological environments, leading to the formation of economically viable deposits.

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Concentrations of the 21 elements were dichotomized by the median concentrations of the subjects. The ORs associated with hypertension risk were presented in Fig. 2 . The univariate ORs (UORs) of 6 elements (Cu, Sm, Gd, Dy, Yb and La) were significantly higher than 1 ( p < 0.05) and the UORs of another 5 elements (Cd, Pb, Se, …

The rare earth element profiles from the water column of five stations in the Okinawa Trough are shown in Fig. 4. The REE profile of Station 2011-5 shows markedly higher concentrations than those of the other stations at depths of less than nearly 400 m, especially for LREEs and MREEs.

Acid mine drainage (AMD) contains rare earth element (REE) concentrations several orders of magnitude higher than those of the rest of natural waters and could be a secondary source of REEs. In ...

Separation and concentration of rare earth elements from wastewater using. electrodialysis technology. Changbai Li, Deepika L Ramasamy, Mika Sillanpä ä, Eveliina Repo. PII: S1383-5866(20)31916-X.

The concentration of lanthanides (rare earth elements) in plant and soil samples were determined by means of atomic emission spectroscopy with inductively coupled plasma (AES-ICP).

The paper presents the results of analyses of the content of rare earth elements (REEs) in surface water and bottom sediment in the river-lake system of Lake Wadąg located in the Masuria Lakeland ...

Rare earth elements occur in many minerals but typically in concentrations too low to be refined in an economical manner; the concentration of REEs in the Earth's crust is …

The estimated average concentration of the REE in the Earth's crust which ranges from around 130 μg/g to 240 μg/g which is actually significantly higher than …

Rare earth elements (REEs) are a group of elements whose concentration in numerous environmental matrices continues to increase; therefore, the use of …

Rare earth elements (REEs) are ubiquitous in the environment. Animal experiments have shown that many REEs have adverse impacts on the health of fetuses. However, data from humans are scarce. In this study, we examined the associations between concentrations of 10 REEs in maternal serum and the risk …

Thirty-two (32) soil and plant samples were collected in agricultural areas of the Philippines representing the major soil series devoted to irrigated rice production. Soil Sr levels were higher ...

The distribution of REEs in the moss-soil system differed considerably, but all the samples showed the average percent of increase of medium rare earth elements. The shale-normalized concentration ratios calculated for selected elements (LaN/YbN, GdN/YbN, LaN/SmN) were in the range of 1.22-2.43, 1.74-3.10 and 0.86-1.09.

Karst is a unique landform formed by strong chemical weathering of carbonate rocks. This study investigated the concentration and speciation of rare earth elements and yttrium (REY) in alluvial soils and REY fractionation from carbonate rocks and alluvial soils in the world's largest contiguous karst landform in southwestern China.

Rare earth elements are not exactly rare in nature; these can be found in more than 200 minerals (British Geological Survey, 2011). However, key difficulties in their mining are caused by low concentrations in poor grade ores for economic and sustainable mining, the production of radioactive thorium as a biproduct, regulatory pressures etc ...

Plants and soils from a natural thorium and rare-earth element occurrence (Morro do Ferro, Brazil) were analyzed by alpha spectrometry (Th) and ICP-AES (REE), after pre-concentration of the elements by solvent extraction, co-precipitation and ion exchange procedures. Leaching experiments with humic acid solutions and different soils …

Deep-sea sediments containing high concentrations of rare earth elements (REE) and yttrium (Y), termed REY-rich sediments, have attracted considerable attention and are widely distributed in the ...

Global natural concentrations of Rare Earth Elements in aquatic organisms: Progress and lessons from fifty years of studies - ScienceDirect. Science of The Total Environment. …

A method is given for the quantithtive separation and determination of individual rare earth elements in minerals. The method utilizes ion-exchange chromatography (0.5 M ammonium lactate in pH = 3 ...

Upper crustal samples used in this study come from those previously well-characterized by major and many of the trace element compositions (Table 1).They include (1) the suite of Post-Archean Shales (PAAS) which Taylor and his co-workers originally used to constrain the rare earth element (REE) contents of the upper crust (Nance and …

Coal-derived power comprises over 39% of the world's power production. Therefore, a mass volume of coal combustion byproducts are generated and shifted the extra burden onto the economy and environment. Circulating fluidized bed combustion (CFBC) has been found to be a clean and ultimate technology for Korea's coal-fired …

The association of rare earth element (REE) exposure with hypertension is not well understood. • Concentrations of Ce and La in serum were found to be higher in the cases than the control.. Concentrations of Ce and La in serum were positively correlated with blood pressure.. Environmental exposure to REEs, especially Ce and La, …

The entire database compiled 19,354 data of REEs, with 19,013 concentrations of individual REE and 341 data of ∑REEs. The number of available data per REE (Fig. 1 A) shows a factor of 2 between the most frequently detected REE (La) and the least detected REE (Tm).Except for La, even-numbered REEs (i.e. Ce, Nd, Sm, Gd, Dy, Er, Yb) are …

The estimated average concentration of the rare earth elements in the Earth's crust, which ranges from around 150 to 220 parts per million (table 1), exceeds that of many other metals that are mined on an industrial scale, such as copper (55 parts per million) and …

Using a bioengineered protein-based technology, Lawrence Livermore National Laboratory (LLNL) scientists and collaborators will develop a new separation technique that …

Key concepts in interpreting the concentrations of the rare earth elements in zircon. Antony D.Burnham. Show more. Add to Mendeley. …

The Green River oil shales had lower rare earth element concentrations (66.3 to 141.3 micrograms per gram, μg g-1) than are typical of material in the upper crust (approximately 170 μg g-1) and were also lower in rare earth elements relative to the North American shale composite (approximately 165 μg g-1). Adjusting for dilution of rare ...

1. Introduction. Generally, rare earth elements include 15 lanthanides (La–Lu) and yttrium (Y), namely REE + Y, so rare earth elements are usually referred to as REY. 1 REY has excellent magnetic, optical and electrical properties, which is widely used not only in traditional fields such as military, petrochemical, metallurgy, but also in the …

Rare earth element concentrations were also found to be higher in benthic fish species compared to pelagic species collected from Xiamen Bay, an industrialized harbor in China (Guo et al., 2003). The mean and range of ΣREE concentrations from 28 saltwater species of fish collected from Xiamen Bay were 0.078 (range 0.012–0.597) mg …

Rare earth elements (REEs) are a group of elements whose concentration in numerous environmental matrices continues to increase; therefore, the use of biological methods for their removal from soil would seem to be a safe and reasonable approach. The aim of this study was to estimate the phytoextrac …