globalchange  > 气候变化事实与影响
DOI: 10.1016/j.watres.2018.11.046
Scopus ID: 2-s2.0-85057552132
Impact of eutrophication on arsenic cycling in freshwaters
Author: Tang Y.; Zhang M.; Sun G.; Pan G.
Source Publication: Water Research
ISSN: 431354
Publishing Year: 2019
pages begin: 191
pages end: 199
Language: 英语
Keyword: Arsenic metabolism functional genes ; Arsenic volatilization ; Harmful algae bloom ; Organic matter ; Sediment-water-air interfaces ; X-ray absorption spectroscopy
Scopus Keyword: Algae ; Alkylation ; Anoxic sediments ; Biogeochemistry ; Biological materials ; Eutrophication ; Genes ; Health risks ; Organic compounds ; Risk assessment ; Veterinary medicine ; Water ; Water absorption ; X ray absorption spectroscopy ; Arsenate reductase ; Functional genes ; Harmful algae ; In-situ assessment ; Laboratory simulation ; Methyltransferases ; Natural organic matters ; Water-air interface ; Phase interfaces ; arsenic ; fresh water ; natural organic matter ; sulfur ; water ; alga ; algal bloom ; anoxia ; arsenic ; eutrophic environment ; eutrophication ; experimental study ; freshwater ; gene ; induced response ; organic matter ; pollution effect ; sediment-water interface ; volatilization ; X-ray spectroscopy ; air ; algal bloom ; anoxia ; arra gene ; arsc gene ; arsenic poisoning ; arsenite methyltransferase gene ; Article ; atmosphere ; biogeochemical cycling ; controlled study ; eutrophication ; gene ; hypoxia ; incubation time ; methylation ; microbial biomass ; microbial degradation ; nonhuman ; priority journal ; reduction (chemistry) ; sediment ; simulation ; synchrotron radiation ; X ray absorption spectroscopy ; algae ; Animalia
English Abstract: Many arsenic-bearing freshwaters are facing with eutrophication and consequent algae-induced anoxia/hypoxia events. However, arsenic cycling in eutrophic waters and its impact on public health are poorly understood. Laboratory simulation experiments are performed in this study to investigate the effect of algal blooms on the cycling of arsenic in a sediment–water–air system. We found that the anoxia induced by the degradation of algal biomass promoted an acute arsenic (mostly As(III)) release within two days from sediment to both the water and atmosphere, and the release effluxes were proportional to the algae dosage. The reduction and methylation of arsenic were enhanced at the sediment–water interface, owing to the significant increase in arsenate reductase genes (arrA and arsC), and arsenite methyltransferase genes (arsM) caused by increased anoxia. The analysis of synchrotron-based X-ray absorption spectroscopy indicated that the concomitantly released natural organic matter (NOM) and sulfur (S) at the sediment–water interface reduced the As(III) release to a certain extent in the later reducing period of incubation, by forming As 2 S 3 (43–51%) and As(III)-Fe-NOM (28–35%). Our results highlight the needs for the in-situ assessment of volatile arsenic in eutrophic freshwaters with its risk to human and animal health. © 2018 The Authors
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Document Type: 期刊论文
Appears in Collections:气候变化事实与影响

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Affiliation: Key Laboratory of Environmental Nanotechnology and Health Effects, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; Centre of Integrated Water-Energy-Food Studies (iWEF), School of Animal, Rural, and Environmental Sciences, Nottingham Trent University, Brackenhurst CampusNG25 0QF, United Kingdom; University of Chinese Academy of Sciences, Beijing, 100049, China

Recommended Citation:
Tang Y.,Zhang M.,Sun G.,et al. Impact of eutrophication on arsenic cycling in freshwaters[J]. Water Research,2019-01-01
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