Major, trace and rare earth element (REE) geochemistry of …
Major-oxides, loss on ignition (LOI), trace elements, and rare earth element contents analysed by ICP-MS and ICP-AES of 11 manganese oxide-hydroxide samples are given in Table 1. The MnO contents in the Nikopol manganese deposits vary from 32.4 to 54.5 wt% with an average of 40.7%.
10 Rarest Elements on Earth
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 …
Accumulation and Translocation of Rare Trace Elements in …
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 …
Trace element composition of micas from rare-metal …
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.
Trace and rare earth elements in the Permian shales: …
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 …
Spatial distribution, sources and risk assessment of
The samples were analyzed for PTEs and rare earth elements for the purpose of identifying their possible sources and to evaluate their environmental risk in the region. ... Rupakheti, D. et al. Spatial distribution, sources and risk assessment of potentially toxic trace elements and rare earth elements in soils of the Langtang Himalaya, Nepal ...
Hydrogeochemistry of trace and rare earth elements in the …
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.
Determination of rare earth elements and other trace elements …
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 ...
Hypertension risk is associated with elevated concentrations of rare …
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 …
Trace elements and rare earth elements in wet deposition …
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 and rare earth element systematics of cold-seep …
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 …
Geochemistry of rare earth and trace elements in springs …
This study investigated the geochemical behavior and aqueous speciation of rare earth elements (REEs) in the geothermal, cold spring, surface waters, and wall rocks in the Havza (Samsun, Turkey) area. The sampled waters have temperatures ranging from 9.8 to 53 °C, pH values between 6.83 and 8.63, and total dissolved solids between 161 …
Major, Minor, and Trace Elements
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 …
Trace Elements: What Are They, Nutrition, and More …
Trace elements refer to any chemical element that is present in the body in very small amounts. Trace elements can be classified as nutritionally essential, probably essential, or potentially toxic. The nutritionally essential elements are required for proper physiological and metabolic functions. … See more
Rare Earth Elements (Metals)
Scientists and engineers disagree on exactly which element should be included in a list of the rare earths, but they generally include the fifteen lanthanide elements, plus scandium and yttrium. Despite their name, the rare earths aren't actually rare with respect to abundance in the Earth's crust. The exception is promethium, a …
Rare earth and trace elements enrichment and
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 ...
Temporal variation of trace elements, rare earth elements …
Concentrations of major, trace, and rare-earth elements (REE) were measured in shallow marine limestone samples of the upper Miocene Kudankulam Formation, southern India, in order to investigate ...
Indicative Role of Trace and Rare-Earth Elements of the
The trace and rare-earth elements are inherently favored in reconstruction of genesis and paleoenvironmental conditions for a number of deposits mostly due to their constrained mobility in soils. PAAS normalized rare-earth patterns of the ore deposit indicate positive correlation with that of the underlying dolostones of the Malmani …
Rare earth elements tracing interrill erosion processes as affected …
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 …
Blood concentrations of metals, essential trace …
They include REE, precious metals and other scarce elements, essential trace elements for humans, such as iron, selenium or zinc, and well-known pollutants as …
REE
The group consists of yttrium and the 15 lanthanide elements (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, …
Geochemistry of the trace elements and rare-earth elements …
The Jianshan section in Jianhe County, Guizhou Province, is a very important auxiliary section to the candidate stratotype at the boundary between Cambrian Series 2 and Series 3. Twenty four samples collected from the Jianshan section of the Kaili Formation were analyzed for the concentrations of trace element and rare-earth …
Trace Elements and Rare Earth Elements in Aerosols
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 ...
Multi-trace element and rare earth element composition of …
46 trace elements including 14 rare earth elements (REEs) in coastal Casuarina equisetifolia plant-soil system from 9 sampling sites in Hainan Island were detected by using ICP-MS.
Trace Elements
Trace elements (or trace metals) are minerals present in living tissues in small amounts. Some of them are known to be nutritionally essential, others may be essential …
Distribution and Origin of Major, Trace and Rare Earth Elements
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 …
Origins of Major Element, Trace Element, and …
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 …
Major, trace and rare earth elements dynamics in decomposing litters …
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 ...
The Uptake of Rare Trace Elements by Perennial Ryegrass
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 ...
Trace Elements
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, …