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Toxicity, transformation and accumulation of inorganic arsenic species in a microalga Scenedesmus sp. isolated from soil
- Source :
- Journal of Applied Phycology. 25:913-917
- Publication Year :
- 2012
- Publisher :
- Springer Science and Business Media LLC, 2012.
-
Abstract
- Arsenic speciation and cycling in the natural environment are highly impacted via biological processes. Since arsenic is ubiquitous in the environment, microorganisms have developed resistance mechanisms and detoxification pathways to overcome the arsenic toxicity. This study has evaluated the toxicity, transformation and accumulation of arsenic in a soil microalga Scenedesmus sp. The alga showed high tolerance to arsenite. The 72-h 50 % growth inhibitory concentrations (IC50 values) of the alga exposed to arsenite and arsenate in low-phosphate growth medium were 196.5 and 20.6 mg L−1, respectively. When treated with up to 7.5 mg L−1 arsenite, Scenedesmus sp. oxidised all arsenite to arsenate in solution. However, only 50 % of the total arsenic remained in the solution while the rest was accumulated in the cells. Thus, this alga has accumulated arsenic as much as 606 and 761 μg g−1 dry weight when exposed to 750 μg L−1 arsenite and arsenate, respectively, for 8 days. To our knowledge, this is the first report of biotransformation of arsenic by a soil alga. The ability of this alga to oxidise arsenite and accumulate arsenic could be used in bioremediation of arsenic from contaminated water and soil. Refereed/Peer-reviewed
- Subjects :
- inorganic chemicals
soil alga
biology
Arsenic toxicity
scenedesmus
arsenic
Arsenate
toxicity
chemistry.chemical_element
Plant Science
Aquatic Science
Oceanography
biology.organism_classification
chemistry.chemical_compound
bioaccumulation
Bioremediation
chemistry
Biotransformation
Environmental chemistry
Bioaccumulation
Botany
biotransformation
Arsenic
Scenedesmus
Arsenite
Subjects
Details
- ISSN :
- 15735176 and 09218971
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Phycology
- Accession number :
- edsair.doi.dedup.....ba5eea261cee449293d0adebd02bc14e