Solar Radiation as the Likely Cause of Acid-Soluble Rare-Earth Elements in Sediments of Fresh Water Humic Lakes

2020 ◽  
Vol 54 (3) ◽  
pp. 1545-1553 ◽  
Author(s):  
Petr Porcal ◽  
Aria Amirbahman ◽  
Jiří Kopáček ◽  
Stephen A. Norton
Keyword(s):  
Rare Earth ◽  
Solar Radiation ◽  
Rare Earth Elements ◽  
Fresh Water ◽  
Humic Lakes

Calcium alginate microparticles for rare earth elements preconcentration prior to ICP-MS measurements in fresh water

2018 ◽  
Vol 10 (35) ◽  
pp. 4242-4250 ◽  
Author(s):  
Gabriel G. Arantes de Carvalho ◽  
Denise F. S. Petri ◽  
Pedro V. Oliveira
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Fresh Water ◽  
Calcium Alginate ◽  
Fresh Waters ◽  
Ms Analysis ◽  
Icp Ms

Calcium alginate microparticles were used for the preconcentration of rare earth elements for ICP-MS analysis of fresh waters.

Use of Swimming Cells of Green Paramecia for Detection of Toxic Rare Earth Ions at Lethal and Sub-Lethal Concentration

2014 ◽  
Vol 875-877 ◽  
pp. 2229-2237 ◽  
Author(s):  
Tomonori Kawano
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Metal Ions ◽  
Fresh Water ◽  
Inhibitory Action ◽  
Rare Earth Ions ◽  
Lethal Concentration ◽  
Unicellular Organism ◽  
Engineering Applications

Paramecium bursaria is an unicellular organism that lives widely in fresh water environments such as rivers and ponds. Recent studies have suggested that in vivo cellular robotics using the cells of P. bursaria as micro-machines controllable under electrical and optical stimuli, has a variety of engineering applications such as transport of micro-sized particles in the capillary systems. The present study aimed to test if the swimming cells of P. bursaria, implementable in capillaries or on chips, are applicable for detection of metal ions. For model assays, rare earth elements (REEs) were chosen as target chemicals. In P. bursaria, LC50 values for REE ions ranged between 2.0 and 62.7 µM. Among them, Sc was shown to be most toxic. In addition to the lethal impacts of REE ions, most of REE ions at sub-lethal concentrations at around 10 - 30 µM, showed inhibitory action against the motility of the cells during the electrically forced motility known as galvanotaxisis. In conclusion, in the non-lethal ranges of REE concentration, swimming cells of P. bursaria report the presence of REE ions, by lowering the motility.

Flame spectra of the rare-earth elements*

1962 ◽  
Vol 18 (4) ◽  
pp. 1127-1153
Author(s):  
V FASSEL ◽  
R CURRY ◽  
R KNISELEY
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
The Rare Earth

ESTIMATION OF THE ABUNDANCE AND DISTRIBUTION OF RARE EARTH ELEMENTS IN SOIL AROUND KADUNA REFINING AND PETROCHEMICAL COMPANY USING NUCLEAR TECHNIQUE

2020 ◽  
Vol 4 (2) ◽  
pp. 599-604
Author(s):  
Michael A. Onoja ◽  
P. H. Bukar ◽  
C. U. Omeje ◽  
A. M. Adamu
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Nuclear Technique ◽  
Flood Plains ◽  
Economic Exploitation ◽  
Rare Elements ◽  
Petrochemical Company ◽  
The Moment ◽  
Abundance And Distribution ◽  
Natural Pattern

Instrumental neutron activation analysis (INAA) technique was used to investigate the abundance and distribution of rare earth elements (REE) in soil around Kaduna Refinery. The aim of the study is to assess the rare elements potential of Nigeria for economic exploitation. Five REEs (La, Dy, Eu, Yb, and Lu) were detected in varying concentrations ranging from a minimum of 0.6 µg/g (Lu) to a maximum of 249.0 µg/g (La). The elements existed with trends consistent with the natural pattern of REEs in soil, showing significant Eu and Dy anomalies which characterize upper plains and flood plains. The levels of REEs in soil in the study area were generally slightly above background levels, with minimal (La, Dy, and Eu), moderate (Yb), and significant (Lu) enrichments and trending: Lu ˃Yb ˃ Eu ˃ Dy ˃ La. The abundance of the REEs investigated cannot establish a potential of Nigeria for economic exploitation of the mineral, hence, rare earth project in the study area is not viable at the moment.

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