Influence of aggregated particles on biodegradation activities for dimethylarsinic acid (DMA) in Lake Kahokugata

Maki, T; Hirota, W; Motojima, H; Hasegawa, H; Rahman, MA

Influence of aggregated particles on biodegradation activities for dimethylarsinic acid (DMA) in Lake Kahokugata

Maki, T Hirota, W Motojima, H Hasegawa, H Rahman, MA

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Publication Type:: Journal Article
Citation:: Chemosphere, 2011, 83 (11), pp. 1486 - 1492
Issue Date:: 2011-06-01

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Field	Value	Language
dc.contributor.author	Maki, T	en_US
dc.contributor.author	Hirota, W	en_US
dc.contributor.author	Motojima, H	en_US
dc.contributor.author	Hasegawa, H	en_US
dc.contributor.author	Rahman, MA https://orcid.org/0000-0002-8065-0286	en_US
dc.date.available	2011-01-29	en_US
dc.date.issued	2011-06-01	en_US
dc.identifier.citation	Chemosphere, 2011, 83 (11), pp. 1486 - 1492	en_US
dc.identifier.issn	0045-6535	en_US
dc.identifier.uri	http://hdl.handle.net/10453/18002
dc.description.abstract	Aquatic arsenic cycles mainly depend on microbial activities that change the arsenic chemical forms and influence human health and organism activities. The microbial aggregates degrading organic matter are significantly related to the turnover between inorganic arsenic and organoarsenic compounds. We investigated the effects of microbial aggregates on organoarsenic mineralization in Lake Kahokugata using lake water samples spiked with dimethylarsinic acid (DMA). The lake water samples converted 1μmolL-1 of DMA to inorganic arsenic for 28d only under anaerobic and dark conditions in the presence of microbial activities. During the DMA mineralization process, organic aggregates >5.0μm with bacterial colonization increased the densities. When the organic aggregates >5.0μm were eliminated from the lake water samples using filters, the degradation activities were reduced. DMA in the lake water would be mineralized by the microbial aggregates under anaerobic and dark conditions. Moreover, DMA amendment enhanced the degradation activities in the lake water samples, which mineralized 50μmolL-1 of DMA. The DMA-amended aggregates >5.0μm completely degraded 1μmolL-1 of DMA with a shorter incubation time of 7d. The supplement of KNO3 and NaHCO3 to lake water samples also shortened the DMA-degradation period. Presumably, the bacterial aggregates involved in the chemical heterotrophic process would contribute to the DMA-biodegradation process in Lake Kahokugata, which is induced by the DMA amendment. © 2011 Elsevier Ltd.	en_US
dc.relation.ispartof	Chemosphere	en_US
dc.relation.isbasedon	10.1016/j.chemosphere.2011.01.059	en_US
dc.subject.classification	Environmental Sciences	en_US
dc.subject.classification	Meteorology & Atmospheric Sciences	en_US
dc.subject.mesh	Bacteria	en_US
dc.subject.mesh	Cacodylic Acid	en_US
dc.subject.mesh	Herbicides	en_US
dc.subject.mesh	Water Pollutants, Chemical	en_US
dc.subject.mesh	Water Microbiology	en_US
dc.subject.mesh	Fresh Water	en_US
dc.subject.mesh	Biotransformation	en_US
dc.subject.mesh	Biodegradation, Environmental	en_US
dc.subject.mesh	Microbial Consortia	en_US
dc.title	Influence of aggregated particles on biodegradation activities for dimethylarsinic acid (DMA) in Lake Kahokugata	en_US
dc.type	Journal Article
utslib.citation.volume	11	en_US
utslib.citation.volume	83	en_US
utslib.for	0502 Environmental Science and Management	en_US
utslib.for	039901 Environmental Chemistry (incl. Atmospheric Chemistry)	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	closed_access
pubs.issue	11	en_US
pubs.publication-status	Published	en_US
pubs.volume	83	en_US

Abstract:

Aquatic arsenic cycles mainly depend on microbial activities that change the arsenic chemical forms and influence human health and organism activities. The microbial aggregates degrading organic matter are significantly related to the turnover between inorganic arsenic and organoarsenic compounds. We investigated the effects of microbial aggregates on organoarsenic mineralization in Lake Kahokugata using lake water samples spiked with dimethylarsinic acid (DMA). The lake water samples converted 1μmolL-1 of DMA to inorganic arsenic for 28d only under anaerobic and dark conditions in the presence of microbial activities. During the DMA mineralization process, organic aggregates >5.0μm with bacterial colonization increased the densities. When the organic aggregates >5.0μm were eliminated from the lake water samples using filters, the degradation activities were reduced. DMA in the lake water would be mineralized by the microbial aggregates under anaerobic and dark conditions. Moreover, DMA amendment enhanced the degradation activities in the lake water samples, which mineralized 50μmolL-1 of DMA. The DMA-amended aggregates >5.0μm completely degraded 1μmolL-1 of DMA with a shorter incubation time of 7d. The supplement of KNO3 and NaHCO3 to lake water samples also shortened the DMA-degradation period. Presumably, the bacterial aggregates involved in the chemical heterotrophic process would contribute to the DMA-biodegradation process in Lake Kahokugata, which is induced by the DMA amendment. © 2011 Elsevier Ltd.

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http://hdl.handle.net/10453/18002