RT Journal Article
T1 Arsenic Transfer from As-Rich Sediments to River Water in the Presence of Biofilms
A1 Martiñá Prieto, Diego
A1 Martín-Liñares, Verónica
A1 Piñeiro, Verónica
A1 Barral Silva, María Teresa
AB 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.  was the predominant species in the overlying water in both systems.  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  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 , monomethylarsonic acid (), and dimethylarsinic acid () were detected, suggesting that active methylation (detoxification) processes are occurring in the intracellular compartment
PB Hindawi
SN 2090-9063
YR 2016
FD 2016-08-29
LK http://hdl.handle.net/10347/16034
UL http://hdl.handle.net/10347/16034
LA eng
NO Diego Martiñá Prieto, Verónica Martín-Liñares, Verónica Piñeiro, and María Teresa Barral, “Arsenic Transfer from As-Rich Sediments to River Water in the Presence of Biofilms,” Journal of Chemistry, vol. 2016, Article ID 6092047, 14 pages, 2016. doi:10.1155/2016/6092047
NO The authors wish to thank the Spanish Ministry of Economy and Competitiveness (MINECO-FEDER) for financial support (Projects Ref. CGL2010-22059 and CGL2013-46003-P). Diego Martiñá Prieto wishes to acknowledge the financial support of the Spanish Ministry of Economy and Competitiveness for his FPI Fellowship (BES-2011-044514)
DS Minerva
RD 27 abr 2026