Arsenate retention by epipsammic biofilms developed on streambed sediments: influence of phosphate.
Natural geological conditions together with the impact of human activities could produce environmental problems due to high As concentrations. The aim of this study was to assess the role of epipsammic biofilm-sediment systems onto As (V) sorption and to evaluate the effect of the presence of equimo...
| Publicado en: | BioMed Research International Vol. 2013; pp. 591634 - 591635 |
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| Autores principales: | , , , , |
| Formato: | research Journal Article |
| Publicado: |
Wiley-Blackwell
2013
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104108998&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104108998 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 23146133 FT2T jtl: BioMed Research International issn: 23146133 maglogo: N pubinfo: dt: 2013 vid: 2013 pid: 480 pub: Wiley-Blackwell place: Malden, Massachusetts artinfo: ui: 104108998 104108998 2012354923 NLM24175294 PMC3794508 104108998 ppf: 591634 ppct: 1 formats: fmt: @attributes: type: P tig: atl: Arsenate retention by epipsammic biofilms developed on streambed sediments: influence of phosphate. aug: au: Prieto, D M Devesa-Rey, R Rubinos, D A Díaz-Fierros, F Barral, M T affil: Department of Soil Science and Agricultural Chemistry, Facultad de Farmacia, Campus Vida, 15782 Santiago de Compostela, Spain. sug: subj: Arsenates Metabolism Biofilms Models, Biological Phosphates Metabolism Natural Environment Human ab: Natural geological conditions together with the impact of human activities could produce environmental problems due to high As concentrations. The aim of this study was to assess the role of epipsammic biofilm-sediment systems onto As (V) sorption and to evaluate the effect of the presence of equimolar P concentrations on As retention. A natural biofilm was grown on sediment samples in the laboratory, using river water as nutrient supplier. Sorption experiments with initial As concentrations 0, 5, 25, 50,100, 250, and 500 μg L-1 were performed. The average percentage of As sorbed was 78.9 ±3.5 and 96.9 ± 6.6% for the sediment and biofilmsediment systems, respectively. Phosphate decreased by 25% the As sorption capactity in the sediment devoid of biofilm, whereas no significant effect was observed in the systems with biofilm. Freundlich, Sips, and Toth models were the best to describe experimental data. The maximum As sorption capacity of the sediment and biofilm-sediment systems was, respectively, 6.6 and 6.8 μgg-1 and 4.5 and 7.8 μgg-1 in the presence of P. In conclusion, epipsammic biofilms play an important role in the environmental quality of river systems, increasing As retention by the system, especially in environments where both As and P occur simultaneously. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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