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New insights about the rare earth elements (REE) mobility in river waters

Samuel Deberdt, Jerome Viers and Bernard Dupre
New insights about the rare earth elements (REE) mobility in river waters
Bulletin de la Societe Geologique de France (2002) 173 (2): 147-160

Abstract

While the rare earth elements (REE) have largely contributed to the understanding of some internal geological processes, their use as tracers of superficial mechanisms (i.e., weathering and elements transport) remains tricky. This results from the poor knowledge we have of the REE distribution in the different fractions of solutions. Up to recently, the studies carried out on the REE behavior in continental aquatic systems were mainly based on the "particulate" and "solution" fractions separated by an arbitrary filtration through a 0.20 or 0.45 mu m pore size membrane. Some recent work has shown, using ultrafiltration experiments, the REE are mainly contained in the colloidal fraction (i.e., 0.20 mu m-1 nm). However, studies devoted to the control of REE by the colloidal matter, have essentially focused on the organic pool (i.e., humic substances). By contrast, the mineral colloidal pool has received little attention. In order to model these processes, we have developed a combined approach that consider (1) ultrafiltration experiments performed on a series of rivers located in Africa (Cameroon) and south America (Brazil, Venezuela) and (2) speciation calculations. This quantitative approach reveals, for the first time, that more than 60% of the total REE in the solution of river waters is controlled by the mineral colloidal pool.


ISSN: 0037-9409
EISSN: 1777-5817
Serial Title: Bulletin de la Societe Geologique de France
Serial Volume: 173
Serial Issue: 2
Title: New insights about the rare earth elements (REE) mobility in river waters
Affiliation: Universite Paul Sabatier, Laboratoire des Mecanismes de Transferts en Geologie, Toulouse, France
Pages: 147-160
Published: 2002
Text Language: English
Summary Language: French
Publisher: Societe Geologique de France, Paris, France
References: 59
Accession Number: 2002-054122
Categories: HydrogeologyHydrochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
S04°30'00" - N01°00'00", W73°30'00" - W49°30'00"
S34°00'00" - N05°15'00", W74°00'00" - W34°00'00"
N02°00'00" - N13°00'00", E08°00'00" - E17°00'00"
N00°45'00" - N12°10'00", W73°15'00" - W59°55'00"
Country of Publication: France
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200218
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