The behavior of rare earth elements in naturally and anthropogenically acidified waters

Journal of Alloys and Compounds
By: , and 

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Abstract

In this paper, the behavior of rare earth elements (REE) in a watershed impacted by acid-mine drainage (Fisher Creek, Montana) is compared to that in a volcanically acidified watershed (Rio Agrio and Lake Caviahue, Argentina). The REE behave conservatively in acidic waters with pH values less than approximately 5.5. However, above pH 5.5, REE concentrations are controlled by adsorption onto or co-precipitation with a variety of Fe or Al oxyhydroxides. The heavy REE partition to a greater extent into the solid phase than the light REE as pH rises above 6. Concentrations of REE exhibit diel (24-h) cycling in waters that were initially acidic, but have become neutralized downstream. In Fisher Creek, at the most downstream sampling station investigated (pH 6.8), concentrations of dissolved REE were 190–840% higher in the early morning versus the late afternoon. This cycling can be related to temperature-dependent, cyclic adsorption–desorption of REE onto hydrous ferric or aluminum oxide or both. Similar but gentler diel cycling of the REE was found at Rio Agrio. The existence of such cycling has important ramifications for the study of REE in natural waters.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title The behavior of rare earth elements in naturally and anthropogenically acidified waters
Series title Journal of Alloys and Compounds
DOI 10.1016/j.jallcom.2005.07.082
Volume 418
Issue 1-2
Year Published 2006
Language English
Publisher Elsevier
Contributing office(s) Toxic Substances Hydrology Program
Description 5 p.
First page 161
Last page 165