Uranium speciation in river sediments contaminated by phosphate ores
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Tipus de documentArticle
Data publicació2012-03
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Abstract
Large amounts of phosphate ores with high
concentrations of uranium were dumped by a phosphate
plant into the Flix water reservoir in the Ebre River,
Catalonia, NE Spain. These phosphate wastes have been
mixed over the years with effluents from other industries as
well as with the sediments of the river, resulting in a
complex mixture of solid wastes and sediments. No
investigations on uranium speciation in such sediments
were made because of the complexity of the sediments
composition as well as the relatively low uranium content.
However, these studies are necessary in order to predict the
release of the uranium to the river waters. Here, we studied
uranium speciation in sediments from two sampling points
of the Flix water reservoir and at depths from 5 to 113 cm.
We used room temperature time-resolved laser fluorescence
spectroscopy and a three-step sequential extraction
procedure described by the Standards, Measurements, and
Testing Programme of the European Union. We found that
uranium was mainly present in the sediment samples as
meta-autunite [Ca(UO2)2(PO4)2 10–12H2O], whose low
solubility will result in a low release of uranium to the river
waters. In addition, we found that some uranium was
linked to sediments by forming surface complexes. We
therefore made the first study of uranium speciation in the
sediments of the Flix water reservoir.
CitacióMeca, S. [et al.]. Uranium speciation in river sediments contaminated by phosphate ores. "Environmental chemistry letters", Març 2012, vol. 10, núm. 1, p. 49-53.
ISSN1610-3653
Versió de l'editorhttp://www.springerlink.com/content/d27331v61012n663/fulltext.pdf
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