Jarosite dissolution I - trace cation flux in acid sulfate soils

Welch, Susan A., Christy, Andrew G., Kirste, Dirk, BeaviS, Sara G. and Beavis, Fern (2007) Jarosite dissolution I - trace cation flux in acid sulfate soils. Chemical Geology, 245 3-4: 183-197. doi:10.1016/j.chemgeo.2007.07.028


Author Welch, Susan A.
Christy, Andrew G.
Kirste, Dirk
BeaviS, Sara G.
Beavis, Fern
Title Jarosite dissolution I - trace cation flux in acid sulfate soils
Journal name Chemical Geology   Check publisher's open access policy
ISSN 0009-2541
1872-6836
Publication date 2007-11-15
Sub-type Article (original research)
DOI 10.1016/j.chemgeo.2007.07.028
Open Access Status Not yet assessed
Volume 245
Issue 3-4
Start page 183
End page 197
Total pages 15
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
In order to determine trace metal release, dissolution experiments were conducted with a natural jarosite-group sample under a range of conditions relevant to acid sulfate soils. The reaction is incongruent with respect to the Fe3+-dominant octahedral cation layer and other elements that substitute for ferric iron. Transition metals that substitute into the octahedral site are almost entirely retained in the solid phase, although when Fe3+ becomes increasingly soluble, Cr3+ concentration also increases. The solubility behaviour of Rb+ and Sr2+ generally follows that of K+, although the heavier cations are liberated faster in the early stages of the reaction. The REE are also large enough to substitute for K+, but their behaviour is more complex. The REE distribution of the solutions, when normalized to Post-Archean Average Australian Shale (PAAS), show enrichments in the MREE in the dissolution experiments, despite the fact that the initial starting material is enriched in the LREE. Mechanisms for LREE and HREE depletion in solution are discussed.
Keyword Acid sulfate soils
Jarosite
Rare earth elements
Trace metals
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth and Environmental Sciences
 
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