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- W2493260701 abstract "The mobility of arsenic in contaminated aquifers is primarily controlled by the presence of iron (hydr)oxides and sulfides. Under reducing conditions, bacteria that can alter ferric bearing phases will likely have a strong effect on the chemistry and hence the mobility of arsenic. Here we investigate how arsenic complexed with ferrihydrite is mobilized under dynamic flow conditions in the presence of anaerobic bacteria that can reduce As(V) and/or Fe(III) through dissimilatory processes. Ferrihydrite-coated sands were loaded with 200 to 300 mg Kg-1 As(V) or As(III) and inoculated with Sulfurosprillum barnesii strain SES-3. The sands were packed into columns through which a minimal ground water media was passed. In columns containing As(III)-loaded ferrihydrite and SES-3, As(III) release to the aqueous phase was most intense initially when microbial activity was high and decreased thereafter. Similar results were observed with As(V)-loaded ferrihydrite and SES-3, yet As(V) reduction to As(III) occurred prior to the onset of high Fe(II) in solution. Arsenic release into the aqueous phase is thus coincident with iron reduction and plays a critical role in dissolved arsenic concentrations." @default.
- W2493260701 created "2016-08-23" @default.
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- W2493260701 date "2005-10-03" @default.
- W2493260701 modified "2023-09-26" @default.
- W2493260701 title "Transformation and Transport of Arsenic within Ferric Hydroxide Coated Sands upon Dissimilatory Reducing Bacterial Activity" @default.
- W2493260701 doi "https://doi.org/10.1021/bk-2005-0915.ch006" @default.
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