Spatial and seasonal changes of arsenic species in Lake Taihu in relation to eutrophication

Spatial and seasonal variations of arsenic species in Lake Taihu (including Zhushan Bay, Meiliang Bay, Gonghu Bay, and Southern Taihu) were investigated. Relatively high levels of total arsenic (TAs) and arsenate (As(V)) were observed in hyper-eutrophic regions during summer and autumn, which is att...

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Bibliographic Details
Published in:The Science of the total environment 2016-09, Vol.563-564, p.496-505
Main Authors: Yan, Changzhou, Che, Feifei, Zeng, Liqing, Wang, Zaosheng, Du, Miaomiao, Wei, Qunshan, Wang, Zhenhong, Wang, Dapeng, Zhen, Zhuo
Format: Article
Language:English
Subjects:
Algal blooms
Arsenic - analysis
China
Eutrophication
Freshwater
Lakes - chemistry
Redundancy analysis
Speciation
Transformation
Water Pollutants, Chemical - analysis
Water Quality
Water quality parameters
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Summary:Spatial and seasonal variations of arsenic species in Lake Taihu (including Zhushan Bay, Meiliang Bay, Gonghu Bay, and Southern Taihu) were investigated. Relatively high levels of total arsenic (TAs) and arsenate (As(V)) were observed in hyper-eutrophic regions during summer and autumn, which is attributed to exogenous contamination and seasonal endogenous release from sediments. The distributions of TAs and As(V) were significantly affected by total phosphorus, iron, manganese, and dissolved organic carbon. Arsenite (As(III)) and methylarsenicals (the sum of monomethylarsenic acid (MMA(V)) and dimethylarsenic acid (DMA(V))), mainly from biotransformation of As(V), were affected by temperature-controlled microalgae activities and local water quality parameters, exhibiting significantly higher concentrations and proportions in hyper-eutrophic and middle eutrophic regions during summer compared to mesotrophic region. The eutrophic environment, which induces changes in the main water quality parameters such as phosphorus, chlorophyll-a, iron, manganese, and dissolved organic carbon, can favor the biogeochemical cycling of arsenic in the aquatic systems. [Display omitted] •All As species exhibited higher levels in eutrophic waters during warm seasons.•Eutrophic environment facilitated biogeochemical cycling of As in freshwater.•Conversion of As speciation was derived by biological activity and abiotic factors.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2016.04.132