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Phytofiltration of arsenic and cadmium by using an aquatic plant, Micranthemum umbrosum: Phytotoxicity, uptake kinetics, and mechanism

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Title: Phytofiltration of arsenic and cadmium by using an aquatic plant, Micranthemum umbrosum: Phytotoxicity, uptake kinetics, and mechanism
Authors: Islam, Md. Shariful Browse this author
Saito, Takeshi Browse this author →KAKEN DB
Kurasaki, Masaaki Browse this author →KAKEN DB
Keywords: Arsenic
Cadmium
Micranthemum umbrosum
Phytotoxic
Phytofiltration
Uptake
Issue Date: Feb-2015
Publisher: Elsevier
Journal Title: Ecotoxicology and Environmental Safety
Volume: 112
Start Page: 193
End Page: 200
Publisher DOI: 10.1016/j.ecoenv.2014.11.006
PMID: 25463871
Abstract: Arsenic (As) and cadmium (Cd) are noxious and carcinogenic pollutants that can be removed from water by using emerging, ecofriendly, phytofiltration technology that employs Micranthemum umbrosum. After culturing M. umbrosum for 7 days in a hydroponic experiment, accumulation of 1219±44.11 µg As g−1 and 799.40±30.95 µg Cd g−1 were observed in the leaves, from 1000 µg As L−1 and 1000 µg Cd L−1 of water, respectively. Plant and water samples were analyzed for assessing the As and Cd accumulations, translocations, phytotoxic effects, uptake mechanisms and kinetics, and for evaluating the potential of M. umbrosum in As and Cd phytofiltration. The uptake pattern was leaf>stem>root for both pollutants. The plant showed higher resistance to As than to that to Cd. Uptake of inorganic As species was much greater than that of organic As and was found at above the substrate concentration. However, Cd showed similar uptake pattern to that of inorganic As species, and the data was better fit to a non-linear than a linear model. Low molecular weight substances that have thiol group(s) may be responsible for the binding of As in plants whereas Cd showed a different mechanism to that of As. M. umbrosum showed good As phytofiltration capabilities without any phytotoxic effects, but it was found to be a moderate accumulator of Cd with some phytotoxic effect compare to some other previously studied plant.
Type: article (author version)
URI: http://hdl.handle.net/2115/57538
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藏崎 正明

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