Arsenic Transfer from As-Rich Sediments to River Water in the Presence of Biofilms
The influence of epipsammic biofilms on As release from river sediments was evaluated in a microcosm experiment where biofilms were grown on sediments containing 106 mg kg−1 As, collected in the Anllóns River, and compared with control systems without biofilms. The As transfer to the water column wa...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2016-01-01
|
| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2016/6092047 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832567056423190528 |
|---|---|
| author | Diego Martiñá Prieto Verónica Martín-Liñares Verónica Piñeiro María Teresa Barral |
| author_facet | Diego Martiñá Prieto Verónica Martín-Liñares Verónica Piñeiro María Teresa Barral |
| author_sort | Diego Martiñá Prieto |
| collection | DOAJ |
| description | The influence of epipsammic biofilms on As release from river sediments was evaluated in a microcosm experiment where biofilms were grown on sediments containing 106 mg kg−1 As, collected in the Anllóns River, and compared with control systems without biofilms. The As transfer to the water column was low (<0.11% of total As in the sediment) and was further reduced by 64% in the presence of biofilms. AsV was the predominant species in the overlying water in both systems. AsIII concentration was higher (up to 12% of total dissolved As) in the control systems than in the systems with biofilms, where this species was almost absent. This fact is of toxicological relevance due to the usually higher mobility and toxicity of the reduced AsIII species. Control systems exhibited higher As mobility in water, in sulphate solution, and in weak acid medium and higher bioavailability in diffusive gradient in thin films (DGT) devices. Arsenic retained by the biofilm was equally distributed between extracellular and intracellular compartments. Inside the cells, significant concentrations of AsIII, monomethylarsonic acid (MMAV), and dimethylarsinic acid (DMAV) were detected, suggesting that active methylation (detoxification) processes are occurring in the intracellular compartment. |
| format | Article |
| id | doaj-art-bcaa92007d9c45a3bd8ccc9463d86550 |
| institution | Kabale University |
| issn | 2090-9063 2090-9071 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Chemistry |
| spelling | doaj-art-bcaa92007d9c45a3bd8ccc9463d865502025-02-03T01:02:26ZengWileyJournal of Chemistry2090-90632090-90712016-01-01201610.1155/2016/60920476092047Arsenic Transfer from As-Rich Sediments to River Water in the Presence of BiofilmsDiego Martiñá Prieto0Verónica Martín-Liñares1Verónica Piñeiro2María Teresa Barral3Departamento Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, SpainDepartamento Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, SpainUnidade de Análise Elemental (RIAIDT), Edificio CACTUS-Lugo, Universidade de Santiago de Compostela, 27002 Lugo, SpainDepartamento Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, SpainThe influence of epipsammic biofilms on As release from river sediments was evaluated in a microcosm experiment where biofilms were grown on sediments containing 106 mg kg−1 As, collected in the Anllóns River, and compared with control systems without biofilms. The As transfer to the water column was low (<0.11% of total As in the sediment) and was further reduced by 64% in the presence of biofilms. AsV was the predominant species in the overlying water in both systems. AsIII concentration was higher (up to 12% of total dissolved As) in the control systems than in the systems with biofilms, where this species was almost absent. This fact is of toxicological relevance due to the usually higher mobility and toxicity of the reduced AsIII species. Control systems exhibited higher As mobility in water, in sulphate solution, and in weak acid medium and higher bioavailability in diffusive gradient in thin films (DGT) devices. Arsenic retained by the biofilm was equally distributed between extracellular and intracellular compartments. Inside the cells, significant concentrations of AsIII, monomethylarsonic acid (MMAV), and dimethylarsinic acid (DMAV) were detected, suggesting that active methylation (detoxification) processes are occurring in the intracellular compartment.http://dx.doi.org/10.1155/2016/6092047 |
| spellingShingle | Diego Martiñá Prieto Verónica Martín-Liñares Verónica Piñeiro María Teresa Barral Arsenic Transfer from As-Rich Sediments to River Water in the Presence of Biofilms Journal of Chemistry |
| title | Arsenic Transfer from As-Rich Sediments to River Water in the Presence of Biofilms |
| title_full | Arsenic Transfer from As-Rich Sediments to River Water in the Presence of Biofilms |
| title_fullStr | Arsenic Transfer from As-Rich Sediments to River Water in the Presence of Biofilms |
| title_full_unstemmed | Arsenic Transfer from As-Rich Sediments to River Water in the Presence of Biofilms |
| title_short | Arsenic Transfer from As-Rich Sediments to River Water in the Presence of Biofilms |
| title_sort | arsenic transfer from as rich sediments to river water in the presence of biofilms |
| url | http://dx.doi.org/10.1155/2016/6092047 |
| work_keys_str_mv | AT diegomartinaprieto arsenictransferfromasrichsedimentstoriverwaterinthepresenceofbiofilms AT veronicamartinlinares arsenictransferfromasrichsedimentstoriverwaterinthepresenceofbiofilms AT veronicapineiro arsenictransferfromasrichsedimentstoriverwaterinthepresenceofbiofilms AT mariateresabarral arsenictransferfromasrichsedimentstoriverwaterinthepresenceofbiofilms |