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Fe(II) oxidation by Acidithiobacillus ferrooxidans in pure and mixed cultures in the presence of arsenate |
Xiaofen YANG, Hongmei WANG(), Linfeng GONG, Hima HASSANE, Zhengbo JIANG |
Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China |
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Abstract Fe2+ oxidation by Acidithiobacillus ferrooxidans in pure and mixed cultures was investigated in batch cultures in the presence of arsenate. The pH value was periodically monitored and Fe2+ content was analyzed by the 1,10-phenanthroline method. ICP-AES was employed for the analysis of As(V) concentration in the solution phase. Precipitates were collected and analyzed by X-ray diffraction. Slight enhancement of iron bio-oxidation was observed in mixed cultures with the two greatest As(V) concentrations (1.0 and 5.0 mg/L As), which were enriched from sediment samples in an abandoned copper mine site. As(V) concentrations decreased with time, indicating either the co-precipitation with or the adsorption by jarosite, the major sink of solid phase. Our data suggest that biogenically synthesized jarosite may play an important role in the attenuation of soluble arsenate in natural aquatic environments.
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Keywords
Acidithiobacillus ferrooxidans
arsenate
jarosite
bio-oxidation
geomicrobiology
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Corresponding Author(s):
WANG Hongmei,Email:hmwang@cug.edu.cn
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Issue Date: 05 June 2009
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