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| Titel |
Adsorption, desorption and fractionation of As(V) on untreated and mussel shell-treated granitic material |
| VerfasserIn |
N. Seco-Reigosa, L. Cutillas-Barreiro, J. C. Nóvoa-Muñoz, M. Arias-Estévez, E. Alvarez-Rodríguez, M. J. Fernández-Sanjurjo, A. Núñez-Delgado |
| 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 (2015-03-17), S.337-346 |
| Datensatznummer |
250115407
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| Publikation (Nr.) |
 copernicus.org/se-6-337-2015.pdf |
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| Zusammenfassung |
| As(V) adsorption and desorption were studied on granitic material, coarse and
fine mussel shell and granitic material amended with 12 and 24 t ha−1
fine shell, investigating the effect of different As(V) concentrations and
different pH as well as the fractions where the adsorbed As(V) was retained.
As(V) adsorption was higher on fine than on coarse shell. Mussel shell
amendment increased As(V) adsorption on granitic material. Adsorption data
corresponding to the unamended and shell-amended granitic material were
satisfactory fitted to the Langmuir and Freundlich models. Desorption was
always <19% when the highest As(V) concentration (100 mg L−1)
was added. Regarding the effect of pH, the granitic material showed its
highest adsorption (66%) at pH <6, and it was lower as pH
increased. Fine shell presented notable adsorption in the whole pH range
between 6 and 12, with a maximum of 83%. The shell-amended granitic
material showed high As(V) adsorption, with a maximum (99%) at pH near
8, but decreased as pH increased. Desorption varying pH was always
<26%. In the granitic material, desorption increased progressively
when pH increased from 4 to 6, contrary to what happened to mussel shell.
Regarding the fractionation of the adsorbed As(V), most of it was in the
soluble fraction (weakly bound). The granitic material did not show high
As(V) retention capacity, which could facilitate As(V) transfer to water
courses and to the food chain in case of As(V) compounds being applied on
this material; however, the mussel shell amendment increased As(V) retention,
making this practice recommendable. |
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