Anoxic oxidation of arsenite linked to denitrification in sludges and sediments Export

@article{citeulike:3448227, abstract = {In this study, denitrification linked to the oxidation of arsenite (As(III)) to arsenate (As(V)) was shown to be a widespread microbial activity in anaerobic sludge and sediment samples that were not previously exposed to arsenic contamination. When incubated with 0.5 mM As(III) and 10 mM NO3−, the anoxic oxidation of As(III) commenced within a few days, achieving specific activities of up to 1.24 mmol As(V) formed g−1 volatile suspended solids d−1 due to growth (doubling times of 0.74–1.4 d). The anoxic oxidation of As(III) was partially to completely inhibited by 1.5 and 5 mM As(III), respectively. Inhibition was minimized by adding As(III) adsorbed onto activated aluminum (AA). The oxidation of As(III) was shown to be linked to the complete denitrification of NO3− to N2 by demonstrating a significantly enhanced production of N2 beyond the background endogenous production as a result of adding As(III)–AA to the cultures. The N2 production corresponded closely the expected stoichiometry of the reaction, 2.5 mol As(III) mol−1 N2–N. The oxidation of As(III) linked to the use of common-occurring nitrate as an electron acceptor may be an important missing link in the biogeochemical cycling of arsenic.}, author = {Sun, W. and Sierra, R. and Field, J.}, citeulike-article-id = {3448227}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.watres.2008.08.004}, citeulike-linkout-1 = {http://linkinghub.elsevier.com/retrieve/pii/S0043135408003229}, doi = {10.1016/j.watres.2008.08.004}, issn = {00431354}, journal = {Water Research}, keywords = {denitrification, introduction, novel\_guilds}, month = {November}, number = {17}, pages = {4569--4577}, posted-at = {2008-10-24 16:35:06}, priority = {2}, title = {Anoxic oxidation of arsenite linked to denitrification in sludges and sediments}, url = {http://dx.doi.org/10.1016/j.watres.2008.08.004}, volume = {42}, year = {2008} }

TY - JOUR ID - citeulike:3448227 L3 - citeulike-article-id:3448227 N2 - In this study, denitrification linked to the oxidation of arsenite (As(III)) to arsenate (As(V)) was shown to be a widespread microbial activity in anaerobic sludge and sediment samples that were not previously exposed to arsenic contamination. When incubated with 0.5 mM As(III) and 10 mM NO3−, the anoxic oxidation of As(III) commenced within a few days, achieving specific activities of up to 1.24 mmol As(V) formed g−1 volatile suspended solids d−1 due to growth (doubling times of 0.74–1.4 d). The anoxic oxidation of As(III) was partially to completely inhibited by 1.5 and 5 mM As(III), respectively. Inhibition was minimized by adding As(III) adsorbed onto activated aluminum (AA). The oxidation of As(III) was shown to be linked to the complete denitrification of NO3− to N2 by demonstrating a significantly enhanced production of N2 beyond the background endogenous production as a result of adding As(III)–AA to the cultures. The N2 production corresponded closely the expected stoichiometry of the reaction, 2.5 mol As(III) mol−1 N2–N. The oxidation of As(III) linked to the use of common-occurring nitrate as an electron acceptor may be an important missing link in the biogeochemical cycling of arsenic. IS - 17 JF - Water Research SN - 00431354 EP - 4577 TI - Anoxic oxidation of arsenite linked to denitrification in sludges and sediments VL - 42 SP - 4569 KW - denitrification KW - introduction KW - novel_guilds AU - Sun, W AU - Sierra, R AU - Field, J PY - 2008/11// UR - http://dx.doi.org/10.1016/j.watres.2008.08.004 ER -