Journal
WATER RESEARCH
Volume 150, Issue -, Pages 191-199Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2018.11.046
Keywords
Harmful algae bloom; Arsenic volatilization; Organic matter; Arsenic metabolism functional genes; Sediment-water-air interfaces; X-ray absorption spectroscopy
Funding
- National Key R&D Program of China [2017YFA0207204, 2018YFD0800305]
- National Natural Science Foundation of China [21377003]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09030203]
- Medical Technologies and Advanced Materials Strategic Theme at Nottingham Trent University
Ask authors/readers for more resources
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 As2S3 (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. (C) 2018 The Authors. Published by Elsevier Ltd.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available