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| Titel |
Cobalt, chromium and nickel contents in soils and plants from a serpentinite quarry |
| VerfasserIn |
M. Lago-Vila, D. Arenas-Lago, A. Rodríguez-Seijo, M. L. Andrade Couce, F. A. Vega |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 1 ; Nr. 6, no. 1 (2015-03-05), S.323-335 |
| Datensatznummer |
250115406
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| Publikation (Nr.) |
 copernicus.org/se-6-323-2015.pdf |
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| Zusammenfassung |
| The former serpentinite quarry of Penas Albas (Moeche, Galicia, NW Spain)
left behind a large amount of waste material scattered over the surrounding
area, as well as tailing areas. In this area several soils were studied
together with the vegetation growing spontaneously over them with the aim of
identifying the bioavailability of heavy metals. The potential of spontaneous
vegetation for phytoremediation and/or phytostabilization was evaluated. The
pH of the soils ranges from neutral to basic, with very low organic matter
and nitrogen contents. There are imbalances between exchangeable cations like
potassium (K) and calcium (Ca), mainly due to high magnesium (Mg) content
that can strongly limit plant production. Moreover, in all of the studied
soils there are high levels of cobalt (Co), chromium (Cr) and nickel (Ni)
(>70, >1300 and >1300 mg kg−1, respectively). They exceed the
intervention limits indicated by soil guideline values. Different soil
extractions were performed in order to evaluate bioavailability. CaCl2
0.01 M is the most effective extraction reagent, although the reagent that
best predicts plant availability is a mixture of low molecular weight organic
acids. Festuca rubra, L. is the spontaneous plant growing in the
soils that accumulates the highest amount of the metals, both in shoot and
roots. Festuca also has the highest translocation factor values,
although they are only >1 for Cr. The bioconcentration factor is >1
in all of the cases, except in the shoot of Juncus sp. for Co and
Ni. The results indicate that Festuca is a phytostabilizer of Co and
Ni and an accumulator of Cr, while Juncus sp. is suitable for
phytostabilization. |
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