Seasonal changes of arsenic speciation in lake waters in relation to eutrophication

Hasegawa, H; Rahman, MA; Kitahara, K; Itaya, Y; Maki, T; Ueda, K

Seasonal changes of arsenic speciation in lake waters in relation to eutrophication

Hasegawa, H Rahman, MA

Kitahara, K Itaya, Y Maki, T Ueda, K

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Publication Type:: Journal Article
Citation:: Science of the Total Environment, 2010, 408 (7), pp. 1684 - 1690
Issue Date:: 2010-01-01

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Field	Value	Language
dc.contributor.author	Hasegawa, H	en_US
dc.contributor.author	Rahman, MA https://orcid.org/0000-0002-8065-0286	en_US
dc.contributor.author	Kitahara, K	en_US
dc.contributor.author	Itaya, Y	en_US
dc.contributor.author	Maki, T	en_US
dc.contributor.author	Ueda, K	en_US
dc.date.available	2009-11-30	en_US
dc.date.issued	2010-01-01	en_US
dc.identifier.citation	Science of the Total Environment, 2010, 408 (7), pp. 1684 - 1690	en_US
dc.identifier.issn	0048-9697	en_US
dc.identifier.uri	http://hdl.handle.net/10453/15011
dc.description.abstract	In this study, the influence of eutrophication on arsenic speciation in lake waters was investigated. Surface water samples (n=1-10) were collected from 18 lakes in Japan during July 2007 and February 2008. The lakes were classified into mesotrophic (7 lakes) and eutrophic (11 lakes) based on the total phosphate (T-P) and chlorophyll-a (Chl-a) concentrations in water column. Inorganic, methylated and ultraviolet-labile fractions of arsenic species were determined by combining hydride generation atomic absorption spectrometry with ultraviolet irradiation. Organoarsenicals (mainly methylated and ultraviolet-labile fractions) comprised 30-60% of the total arsenic in most lakes during summer. On the other hand, inorganic arsenic species (As(III+V)) dominates (about 60-85%) during winter. The occurrence of ultraviolet-labile fractions of arsenic was higher in eutrophic lakes than those in mesotrophic lakes in both seasons. The concentration of dimethyl arsenic (DMAA) was high in eutrophic lakes during winter; and in mesotrophic lakes during summer. The results suggest that the conversion of As(III+V) to more complicated organoarsenicals occurred frequently in eutrophic lakes compared to that in mesotrophic lakes, which is thought to be the influence of biological activity in the water column. The distribution of arsenic species were well correlated with phosphate concentrations than those of Chl-a. This might be due to the competitive uptake of As(V) and phosphate by phytoplankton. The organoarsenicals (OrgAs)/As(V) ratio was higher at low phosphate concentration indicating that conversion of As(V) to OrgAs species was more active in phosphate-exhausted lakes with high phytoplankton density. © 2009 Elsevier B.V.	en_US
dc.relation.ispartof	Science of the Total Environment	en_US
dc.relation.isbasedon	10.1016/j.scitotenv.2009.11.062	en_US
dc.subject.classification	Environmental Sciences	en_US
dc.subject.mesh	Arsenic	en_US
dc.subject.mesh	Seasons	en_US
dc.subject.mesh	Fresh Water	en_US
dc.subject.mesh	Eutrophication	en_US
dc.title	Seasonal changes of arsenic speciation in lake waters in relation to eutrophication	en_US
dc.type	Journal Article
utslib.citation.volume	7	en_US
utslib.citation.volume	408	en_US
utslib.for	0704 Fisheries Sciences	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	7	en_US
pubs.publication-status	Published	en_US
pubs.volume	408	en_US

Abstract:

In this study, the influence of eutrophication on arsenic speciation in lake waters was investigated. Surface water samples (n=1-10) were collected from 18 lakes in Japan during July 2007 and February 2008. The lakes were classified into mesotrophic (7 lakes) and eutrophic (11 lakes) based on the total phosphate (T-P) and chlorophyll-a (Chl-a) concentrations in water column. Inorganic, methylated and ultraviolet-labile fractions of arsenic species were determined by combining hydride generation atomic absorption spectrometry with ultraviolet irradiation. Organoarsenicals (mainly methylated and ultraviolet-labile fractions) comprised 30-60% of the total arsenic in most lakes during summer. On the other hand, inorganic arsenic species (As(III+V)) dominates (about 60-85%) during winter. The occurrence of ultraviolet-labile fractions of arsenic was higher in eutrophic lakes than those in mesotrophic lakes in both seasons. The concentration of dimethyl arsenic (DMAA) was high in eutrophic lakes during winter; and in mesotrophic lakes during summer. The results suggest that the conversion of As(III+V) to more complicated organoarsenicals occurred frequently in eutrophic lakes compared to that in mesotrophic lakes, which is thought to be the influence of biological activity in the water column. The distribution of arsenic species were well correlated with phosphate concentrations than those of Chl-a. This might be due to the competitive uptake of As(V) and phosphate by phytoplankton. The organoarsenicals (OrgAs)/As(V) ratio was higher at low phosphate concentration indicating that conversion of As(V) to OrgAs species was more active in phosphate-exhausted lakes with high phytoplankton density. © 2009 Elsevier B.V.

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