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Influence of algal blooms decay on arsenic dynamics at the sediment-water interface of a shallow lake.
Chemosphere. 2019 Mar; 219:1014-1023.C

Abstract

Algal blooms decay affects the mobility, bioavailability, and toxicity of arsenic (As) in aquatic environments. The decaying process alters aquatic redox conditions and also introduces ample organic matter, conditions favorable for microbial reduction to simulate As release and As species transformation. This study investigated the role of algae (Microcystis aeruginosa (MA)) blooms decay on the dynamics of labile As and elements associated with its release, such as iron (Fe), manganese (Mn) and sulfide (S), at the sediment-water surface (SWI) of a shallow lake (Lake Taihu) in China, applying mesocosm incubation. A combined AgI/ZrO-Chelex diffusive gradients in thin films (DGT) technology was used to examine labile As, Fe, Mn, and S variations in sediments during none-MA, low-MA, and high-MA treatments. High-MA blooms decay generated strong anoxic conditions, which are favorable for the release of labile As, Fe, Mn, and S from sediment. Labile S produced from the reduction of sulfate caused by decaying MA was likely removed by labile Fe through the formation of Fe-sulfides under reducing conditions. Furthermore, this condition facilitated arsenate (As(V)) reduction to arsenite (As(III)), which was weakly adsorbed by Fe-sulfides and thus mobilized to the aqueous phase. An increase in the sediment resupply of solids As to pore water along with MA blooms decay was also revealed by the DGT-induced fluxes in sediment model, coupled with the average desorption rate constant increasing from 0.27 × 10-6 s-1 to 3.41 × 10-6 s-1, and the average response time decreasing from 7859 s to 1538 s.

Authors+Show Affiliations

Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China. Electronic address: czyan@iue.ac.cn.Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30682758

Citation

Zeng, Liqing, et al. "Influence of Algal Blooms Decay On Arsenic Dynamics at the Sediment-water Interface of a Shallow Lake." Chemosphere, vol. 219, 2019, pp. 1014-1023.
Zeng L, Yan C, Guo J, et al. Influence of algal blooms decay on arsenic dynamics at the sediment-water interface of a shallow lake. Chemosphere. 2019;219:1014-1023.
Zeng, L., Yan, C., Guo, J., Zhen, Z., Zhao, Y., & Wang, D. (2019). Influence of algal blooms decay on arsenic dynamics at the sediment-water interface of a shallow lake. Chemosphere, 219, 1014-1023. https://doi.org/10.1016/j.chemosphere.2018.12.080
Zeng L, et al. Influence of Algal Blooms Decay On Arsenic Dynamics at the Sediment-water Interface of a Shallow Lake. Chemosphere. 2019;219:1014-1023. PubMed PMID: 30682758.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of algal blooms decay on arsenic dynamics at the sediment-water interface of a shallow lake. AU - Zeng,Liqing, AU - Yan,Changzhou, AU - Guo,Jianhua, AU - Zhen,Zhuo, AU - Zhao,Yuan, AU - Wang,Dapeng, Y1 - 2018/12/11/ PY - 2018/08/03/received PY - 2018/12/03/revised PY - 2018/12/10/accepted PY - 2019/1/27/entrez PY - 2019/1/27/pubmed PY - 2019/2/23/medline KW - Algal blooms decay KW - Arsenic KW - Diffusive gradients in thin-films KW - Mesocosm experiment SP - 1014 EP - 1023 JF - Chemosphere JO - Chemosphere VL - 219 N2 - Algal blooms decay affects the mobility, bioavailability, and toxicity of arsenic (As) in aquatic environments. The decaying process alters aquatic redox conditions and also introduces ample organic matter, conditions favorable for microbial reduction to simulate As release and As species transformation. This study investigated the role of algae (Microcystis aeruginosa (MA)) blooms decay on the dynamics of labile As and elements associated with its release, such as iron (Fe), manganese (Mn) and sulfide (S), at the sediment-water surface (SWI) of a shallow lake (Lake Taihu) in China, applying mesocosm incubation. A combined AgI/ZrO-Chelex diffusive gradients in thin films (DGT) technology was used to examine labile As, Fe, Mn, and S variations in sediments during none-MA, low-MA, and high-MA treatments. High-MA blooms decay generated strong anoxic conditions, which are favorable for the release of labile As, Fe, Mn, and S from sediment. Labile S produced from the reduction of sulfate caused by decaying MA was likely removed by labile Fe through the formation of Fe-sulfides under reducing conditions. Furthermore, this condition facilitated arsenate (As(V)) reduction to arsenite (As(III)), which was weakly adsorbed by Fe-sulfides and thus mobilized to the aqueous phase. An increase in the sediment resupply of solids As to pore water along with MA blooms decay was also revealed by the DGT-induced fluxes in sediment model, coupled with the average desorption rate constant increasing from 0.27 × 10-6 s-1 to 3.41 × 10-6 s-1, and the average response time decreasing from 7859 s to 1538 s. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/30682758/Influence_of_algal_blooms_decay_on_arsenic_dynamics_at_the_sediment_water_interface_of_a_shallow_lake_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(18)32402-0 DB - PRIME DP - Unbound Medicine ER -