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Rare Earth Elements : Their Importance in Understanding Soil Genesis
Joint Authors
Aide, Michael T.
Aide, Christine
Source
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-05-09
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
The rare earth elements (REEs) are commonly defined as lanthanum (La) and the 14 elements comprising the Lanthanide series.
The REE’s typically exhibit trivalent oxidation states; however, Europium may also occur as Eu2+ and Cerium may occur as Ce4+.
The REE’s ionic radii decrease on progression from La to Lu, which results in a slight but predictable change in their chemical affinity.
Typically, the light REE (La to Sm) reside in trace minerals such as apatite, epidote and allanite, whereas the heavy REE (Gd to Lu) are associated with minerals such as zircon.
Investigations typically show that the REE are depleted in near-surface horizons and accumulate in deeper horizons or the regolith as clay-oxyhydroxide adsorbates or REE-phosphate precipitates.
Numerous studies show the heavy REE accumulating in the deeper soil regions to a greater extent than the light REE, whereas other studies show the light REE’s preferentially accumulating at greater soil depths.
The degree of interhorizon transport has great potential to become an index of weather intensity.
The various REE soil migration pathways have been isolated, including lessivage, soil organic matter complexation, leaching in percolating water, adsorption by inorganic colloids, and precipitated by phosphate-bearing minerals.
American Psychological Association (APA)
Aide, Michael T.& Aide, Christine. 2012. Rare Earth Elements : Their Importance in Understanding Soil Genesis. ISRN Soil Science،Vol. 2012, no. 2012, pp.1-11.
https://search.emarefa.net/detail/BIM-497769
Modern Language Association (MLA)
Aide, Michael T.& Aide, Christine. Rare Earth Elements : Their Importance in Understanding Soil Genesis. ISRN Soil Science No. 2012 (2012), pp.1-11.
https://search.emarefa.net/detail/BIM-497769
American Medical Association (AMA)
Aide, Michael T.& Aide, Christine. Rare Earth Elements : Their Importance in Understanding Soil Genesis. ISRN Soil Science. 2012. Vol. 2012, no. 2012, pp.1-11.
https://search.emarefa.net/detail/BIM-497769
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-497769