The rare earth metals naturally have three positive charges and form incredibly strong ionic bonds with phosphate counterions, each possessing three negative charges. The extraction process must ...

Phytolacca americana L. is a herbaceous plant widely distributed in Dingnan county of Jiangxi province, China, which is a REE mining region (ion absorption rare earth mine) and the soil has high levels of REEs. An investigation of REE content of P. americana growing naturally in Dingnan county was conducted.

The behavior of rare earth elements in naturally and anthropogenically acidified waters. Author links open overlay panel Scott A. Wood a, Christopher H. Gammons b, Stephen R. Parker b. Show more. ... Rare earth elements (REEs) are valuable raw materials which are in great demand in modern high technology industries. …

Chloroplasts and chlorophylls were isolated from the leaves of Dicranopteris linearis, a natural perennial fern sampled at rare earth element (REE) mining areas in the South-Jiangxi region (southern China). The inductively coupled plasma-mass spectrometry (ICP-MS) results indicated that REEs were present in the chloroplasts and chlorophylls of D. …

of rare earth elements (REEs) in the naturally grown Phytolacca americana L. in southern China, International Journal of Phytoremediation, 20:5, 415-423, DOI: 10.1080/15226514.2017.1365336.

Rare-earth oxides could provide more robust coating materials because their electron configuration makes them intrinsically hydrophobic, report researchers at Massachusetts Institute of Technology ...

The 17 rare earth elements are: lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), scandium (Sc), and yttrium (Y). Scandium and yttrium are …

Several geologic aspects of the natural occurrence of rare earth elements strongly influence the supply of rare-earth-elements raw materials. These geologic factors are presented as statements of facts followed by a …

In this paper, the behavior of rare earth elements (REE) in a watershed impacted by acid-mine drainage (Fisher Creek, Montana) is compared to that in a volcanically acidified watershed (Rio Agrio and Lake Caviahue, Argentina). The REE behave conservatively in acidic waters with pH values less than approximately 5.5. However, above pH 5.5, REE …

Among them, Promethium (Pm) is the only rare earth element, which does not occur naturally (De Lima and Leal Filho, 2015). Due to the similar geochemical behavior of Y and Sc to the lanthanides (Sc only in aqueous medium), they are also considered as REEs ( McLennan and Taylor, 2012, Voncken, 2016 ).

Uranium, thorium and rare earth elements (REEs) in soil samples contaminated by Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident was determined using inductively coupled plasma-mass ...

Extraction and Separation of Some Naturally Occurring Radionuclides from Rare Earth Elements by Different Amines E. H. Borai* a, A .M. Shahr El-Din a, E .A. EL-Sofany a, A. A. Sakr a, G. O. El ...

Rare earth elements (REEs) are commonly used as geochemical tracers in the study of many geologic processes because of their unique, ... Furthermore, because the naturally occurring REEs exhibit similar ionic radii and identical charge to trivalent actinides (Am 3+, Cm 3+, Cf 3+), ...

Rare earth elements in naturally grown fern Dicranopteris linearis in relation to their variation in soils in south-Jiangxi region (southern China). Wei Z, Yin M, Zhang X, Hong F, Li B, Tao Y, Zhao G, Yan C. Environ Pollut, 114(3):345-355, 01 Jan 2001 Cited by: 32 articles | PMID: 11584633

Environmental Pollution 76 (1992) 157-162 Rare earth elements (REEs) in naturally grown plants in relation to their variation in soils Hideki Ichihashi,a Hideyoshi Moritab & Ryo Tatsukawaa ODepartment of Environment Conservation, Ehime University, Tarumi 3-5-7, Matsuyama 790, Japan bSchool of Medical Sciences, University of …

By National Minerals Information Center. Statistics and information on the worldwide supply of, demand for, and flow of the mineral commodity group rare earths - scandium, yttrium, …

Presented are three studies that utilize three natural tracers (enthalpy, radon gas, and rare earth elements) to characterize hydrologic systems at three different scales. The scale of investigation ranges from 27,900 km2 for the Eastern Snake River Plain (ESRP) regional aquifer to 0.34 km2 for Shepley's Hill in West Central Massachusetts.

Ferns (Dicranopteris linearis) and soils, sampled from four rare earth mining areas and one non-mining area locating in South-Jiangxi region, were chosen for analysis of 15 rare earth elements (REEs) by inductively coupled plasma-mass spectrometry (ICP-MS). The fern samples were divided into 4 parts: root, stem, petiole, and lamina.

The rare earth elements (REEs) comprise the 13 naturally occurring lanthanides, yttrium and scandium 1.These elements have crustal abundances similar to those of copper, zinc and molybdenum 2,3 ...

The last naturally occurring rare earth element (lutetium) was discovered by 1907, but research into the chemistry of these elements was difficult, as no one knew how many real rare earth elements there were. Fortunately, 1913-14 solved the situation with the research of Danish physicist Niels Bohr and English physicist Henry Gwyn Jeffreys Moseley.

Rare earth elements (REEs) are considered environmental pollutants that have received extensive attention recently. The accumulation of REEs in plants is important because REEs can eventually enter the human body via the food chain. Marigolds are widely utilized as medicinal and commercial plants in medicine, feed, and therapeutics. …

Rare-earth elements (REEs) are used in a wealth of high-tech applications, including permanent magnets, lasers, phosphors, catalytic converters, and batteries 1,2,3,4, owing to their 4 f peculiar ...

Rare earth elements (REEs) present a group of nonessential metals for the growth and development of plants. At high concentrations, they can induce internal stress and disturb the physiological ...

The rare earth metals naturally occur together in minerals. For example, monazite is a mixed rare earth phosphate. There is very little difference in the solubility and complex formation ability of the rare earth metals. Rare earth metals are found with non-metals in their third oxidation state (3+). There is very little tendency of these ...

Rare Earth Ore Classification. Classification of ores related to alkaline rocks is also controversial. Table 2 presents a relatively simple classification that follows analogous categories for deposits related to nonalkaline igneous rocks. Some of the more unusual alkaline rocks that host, or are related to, REE ores are carbonatite and phoscorite, …

Factsheet on the origin, distribution, abundance, supply and demand, and uses of rare earth elements. The Principal Rare Earth Elements …

A rare earth element (REE) geochemical finger exercise was undertaken with the aim of distinguishing contributing sources in the event that these sources have a significantly different ...

Thulium: The rarest of all naturally occurring rare earth metals. Has few commercial applications, although it is used in some surgical lasers. After being exposed to radiation in nuclear reactors ...

A rare earth element (REE) hyperaccumulator, Dicranopteris dichotoma, sampled from an REE mining area in South-Jiangxi region, was chosen for analysis of 15 REEs at subcellular and molecular levels by inductively coupled plasma-mass spectrometry (ICP-MS).The sum of the concentrations of 15 REEs (∑REEs) of D. dichotoma leaf was …

Rare earth elements (generally abbreviated as REEs) are the name used to define 17 metals with special physicochemical features. In general, REEs are interest of chemists mainly because of their peculiar chemical abilities. However, this situation started to change, and REEs, recently, turn out to be a hotspot also for environmental biologist, …