Impact of eutrophication on arsenic cycling in freshwaters

Tang, Y., Zhang, M., Sun, G. and Pan, G. ORCID: 0000-0003-0920-3018, 2018. Impact of eutrophication on arsenic cycling in freshwaters. Water Research: a Journal of the International Water Association (IWA). ISSN 0043-1354

[img]
Preview
Text
12715_Pan.pdf - Post-print

Download (1MB) | Preview

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 study 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.

Item Type: Journal article
Publication Title: Water Research: a Journal of the International Water Association (IWA)
Creators: Tang, Y., Zhang, M., Sun, G. and Pan, G.
Publisher: Elsevier on behalf of the International Water Association (IWA)
Date: 21 November 2018
ISSN: 0043-1354
Identifiers:
NumberType
10.1016/j.watres.2018.11.046DOI
S0043135418309758Publisher Item Identifier
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Depositing User: Jill Tomkinson
Date Added: 28 Nov 2018 16:32
Last Modified: 21 Nov 2019 03:00
URI: http://irep.ntu.ac.uk/id/eprint/35159

Actions (login required)

Edit View Edit View

Views

Views per month over past year

Downloads

Downloads per month over past year