The effects of different carbon sources on microbial mediation of arsenic in arsenic-contaminated sediment |
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Authors: | Email author" target="_blank">Jong-Un?LeeEmail author Sang-Woo?Lee Kyoung-Woong?Kim Chung-Han?Yoon |
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Institution: | (1) Department of Civil, Geosystem and Environmental Engineering, Chonnam National University, Gwangju, 500-757, Korea;(2) Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 500-712, Korea |
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Abstract: | Changes in speciation and mobility of As by indigenous bacteria in As-contaminated sediments (339 mg/kg) from an abandoned
Au–Ag mine area in Korea were investigated after biostimulation with a variety of carbon sources, including acetate, lactate
and glucose in batch experiments. Sequential extraction analysis designed to determine the form of As occurrence revealed
that 40 and 47% of As were present in the sediment as Fe-associated and residual fractions, respectively. After 22-day incubation
with acetate and lactate, the presence of indigenous bacteria increased the amount of total dissolved As from both Fe-associated
and residual fractions in the sediment. More than 99% of dissolved As existed as As(V) in biotic slurries in contrast to sterile
controls (less than 50% of total dissolved As), which indicated that indigenous bacteria transformed some dissolved As(III)
to As(V). In real environments, depending on the pH, microbially-produced aqueous As(V) may be either immobilized through
adsorption or reduced to As(III) after migration to the anoxic subsurface. |
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Keywords: | acetate arsenic bacteria glucose heavy metals lactate mine sediment sequential extraction |
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