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- W775202208 abstract "Whether the reductive dissolution of iron (hydr)oxides promotes absorption or desorption of arsenic (As) is still in controversy. Here, we used laboratory simulation experiments to examine the absorption/desorption behavior of As when it is affected by microbial activity. Sediment from Yangzonghai Lake, which is known to be contaminated by As, was used in this experiment, and pollution abatement was performed using ferric salt flocculants (FeCl3). In the presence of sulfides, the reductive dissolution of iron (hydr)oxides affects the behavior of As in sediment in two ways. First, the reductive dissolution of iron (hydr)oxide accelerates the desorption of As, thus releasing As(III) from the sediment, increasing the environmental risk of As. Secondly, reductive dissolution causes the system’s redox conditions to continually change. When the oxidation–reduction potential (Eh) of the system exceeds 80 mV, As is precipitated rather than desorpting. As is co-precipitated with sulfur released previously via microbially induced reductive dissolution, where sulfur precipitation is more important than reductive dissolution of iron (hydr)oxide in controlling the adsorption/desorption of As." @default.
- W775202208 created "2016-06-24" @default.
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- W775202208 date "2015-10-01" @default.
- W775202208 modified "2023-10-02" @default.
- W775202208 title "Effect of reductive dissolution of iron (hydr)oxides on arsenic behavior in a water–sediment system: First release, then adsorption" @default.
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- W775202208 doi "https://doi.org/10.1016/j.ecoleng.2015.06.018" @default.
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