elements rare trace

The present study investigates the geochemistry of the shale samples from the Barren Measures Formation of the Jharia Basin through major and trace element distributions as well as through bulk mineralogical attributes. The rare earth element distribution shows the dominance of light rare earth elements (LREEs) over heavy rare …

The bedrock-normalized REY pattern revealed an enrichment of light rare-earth elements (LREE) and middle rare-earth elements (MREE), a depletion of heavy rare-earth elements and yttrium (HREY ...

In order to investigate the compositions and wet deposition fluxes of trace elements and rare earth elements (REEs) in the precipitation of the southeastern edge of the Tibetan Plateau, 38 precipitation samples were collected from March to August in 2012 in an urban site of Lijiang city in the Mt. Yulong region. The concentrations of most trace ...

Trace element concentrations in seawater can be determined by ICP-MS through external calibration, using certified reference materials or multi-elemental reference standard solutions. ... The efficiency of successive co-precipitations in scavenging rare earth and other trace elements (Hf, Th, Cr, Co, Mn, Y and Zr) from our in house coastal ...

Rare Earth Elements. Typical analysis reports the presence of Lanthanum (La), Cerium (Ce) and Praseodymium (Pr) in AZOMITE® at 644 ppm. Confirmed in greenhouse and field conditions to increase crop yields up to 15% in some plant species, particularly if moisture was limiting. Rare Earth Elements may enhance nitrogen fixation by Azotobacter ...

Many of the trace elements to which people are regularly exposed are necessary for health, but some have no biologic function. Of the mineral elements discussed here, …

The rare earth element (REE) tracing technique is recognized as a useful tool with which to understand soil erosion processes and spatially distributed erosion at slope and watershed scales ... Using rare earth elements to monitor sediment sources from a miniature model of a small watershed in the three Gorges area of China. Catena, 143 …

To evaluate the impact of modern glacier melting on the chemical enrichment of Antarctic coastal waters, we measured trace elements, including dissolved iron (Fe) …

In this study, we sampled and investigated natural waters from 23 sites (involving the crater lake, hot springs, streams, rivers, and bubbling pools) in two campaigns in 2017 and 2018, using physicochemical parameters, major, trace and rare-earth elements concentrations.

Concentrations of 50 chemical elements were analyzed by ICP-MS in whole blood samples. Results: All 50 chemicals studied, including 26 REE and minority elements, were detected. Lead, silver, arsenic, cadmium, mercury, antimony, strontium, thallium and six essential trace elements were detected in more than 70% of the population.

News. Metals, metalloids, and radionuclides all are trace elements that occur naturally in the Earth's crust. In small quantities many trace elements are essential for …

Abundance: only trace amounts found in the Earth's crust; about 60,000 kilograms produced as a byproduct of nuclear power plants each year Atomic Number: 93 Atomic Weight: ... Americium is another …

Successful management of these rare trace elements (RTEs) requires elucidation of their mobility in the soil–plant system. We aimed to determine the capacity of Lolium perenne (a common pasture species) to tolerate and accumulate the RTEs Be, Ga, In, La, Ce, Nd, and Gd in a fluvial recent soil. Cadmium was used as a reference as a well ...

Particularly, the impacts of different geochemical processes on the abundances of trace and rare earth elements in these cold-seep carbonates have sparsely been discussed in previous studies. In the present study, we provide a comprehensive analysis of the major, trace, and rare earth element compositions of authigenic …

REEs have a common electronic configuration with 6 shells, large ionic radii, a 3+-oxidation state and an electronegativity close to those of Ca, Na or Sr but lower than those of the transition elements in the periodic table (Table 1).Rare Earth Elements thus preferentially form ionic than covalent bindings (Henderson, 1984) and are lithophile …

Mining activities create disturbed and polluted areas in which revegetation is complicated, especially in northern areas. For the first time, the state of the ecosystems in the impact zone of tailings formed during the processing of rare earth element deposits in the Subarctic have been studied. This work aimed to reveal aspects of accumulation and …

The trace elements include more than 60 substances that are usually present in low concentrations in the environment and mammalian tissues. They are generally present in tissue and serum in picogram or microgram amounts, and their absorption, distribution, storage, and excretion are tightly controlled. At least a dozen of them are …

The group consists of yttrium and the 15 lanthanide elements (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, …

Although decay related trace and rare earth element dynamics have been documented from few European forest foliar litter (Laskowski and Berg, 1993; Powers and Salute, 2011; Scheid et al., 2009; Tyler, 2005; Brun et al., 2010; Van Nevel et al., 2014), studies investigating their dynamics in other vegetations and in other regions, particularly ...

Trace elements and rare earth elements are ubiquitous and their concentrations in the atmosphere have risen over time due to human activities such as mining, combustions, smelting amongst others ...

This paper investigates the composition of major, trace, and rare earth elements in 15 different species of wild edible mushrooms and the possible effect of urban pollution on elemental uptake. The collected mushrooms include different species from the green areas of the city, exposed to urban pollution, and from the forests, with limited …

Minor elements are elements that constitute 1.0 to 0.01 percent of a coal by weight. Common minor elements in coal are sodium, magnesium, aluminum, silicon, phosphorus, potassium, calcium, titanium, manganese, and iron. Most of the minor elements are associated with the minerals in coal, although phosphorus also is …

This order essentially divides trace elements into large ion lithophile (LILE), rare earth elements (REEs), and high field strength elements (HFSE). This trace element order is a pseudo-Onouma …

1. Introduction. Rare-earth elements (hereinafter referred to as REE) are a group of seventeen chemical elements in the periodic table, in particular the fifteen …

In this classification, the trace elements have been divided into three groups from the point of their nutritional significance in humans, as follows: (1) essential …

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. ... Trace elements have been …

Environmental exposure such as toxic trace elements could be risk factors for hypertension, but the associations of toxic metal exposure with hypertension are not well understood. ... Serum levels of 8 rare earth elements (REEs) and 13 non-REEs were determined. Results: The concentrations of Ce and La were significant higher in the …

Analyses of major and some trace elements have been published by other authors, but without the determination of Li, which was only estimated (Johan et al., 2012; Li et al., 2015). As yet, there exists no synoptic study on trace element compositions of micas from rare-metal granites of different geochemical types and grades of differentiation.

The tectonic setting interpreted from major oxides, ratios of immobile–trace elements and rare earth elements (REE) parameters such as (La/Y)n, (La/Y)n, (Gd/Yb)n and Eu/Eu* depicts a passive ...