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题名: Mechanisms of the photochemical release of phosphate from resuspended sediments under solar irradiation
作者: Li, Xiaolu1; Zhou, Yiyong2; Liu, Guanglong1, 2; Lei, Hongjun3; Zhu, Duanwei1
关键词: Sediment ; Resuspension ; Phosphorus ; Photochemical ; P-31 NMR
刊名: SCIENCE OF THE TOTAL ENVIRONMENT
发表日期: 2017-10-01
DOI: 10.1016/j.scitotenv.2017.04.039
卷: 595, 页:779-786
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Environmental Sciences
研究领域[WOS]: Environmental Sciences & Ecology
英文摘要: In previous studies, resuspended sediments that were exposed to simulated solar irradiation could release dissolved phosphate (PO43-). However, themechanisms of phosphate release remain unclear. In this research, a battery of experiments was performed to reveal the mechanisms of the photochemical release of phosphate from resuspended sediments of a shallow eutrophic lake under solar irradiation. The results show that the PO43- released in resuspended sediments was significantly higher than that in the dark control or in water alone after treatment with solar irradiation for 6 h. The results of sequential chemical extractions showed that the concentrations of labile organic, moderately labile organic and residual organic phosphorus decreased in the resuspended sediment after 6 h of solar irradiation; of these, moderately labile organic phosphorus was the greatest contributor to the release of dissolved phosphate in resuspended sediment. Orthophosphate, phosphate monoesters, phosphate diesters and pyrophosphate were detectedwith P-31 NMR. It isworth mentioning that the diester- P and pyro-P species disappeared after 6 h of irradiation. In addition, enzyme activity and radical trapping experimentswere applied to identify the roles of biomineralization and photochemical degradation during phosphate release from resuspended sediments under solar irradiation. The amount of PO43- released in fresh sediment was greater than that in the autoclaved sediment, which should be attributed to the higher alkaline phosphatase activity in the fresh sediment. However, the PO43- released from the photochemical degradation of organic phosphorus is the primary phosphate source during sediment resuspension under 6 h of solar irradiation. The phosphate photorelease was inhibited when methanol was added to the suspension and decreased significantly when the concentration of methanol was increased from 0.5M to 2.0M. All of these results suggest that photochemical processes may lead to PO43- release from sediment in aquatic environments. (C) 2017 Elsevier B.V. All rights reserved.
关键词[WOS]: ORGANIC-MATTER SOURCE ; PHOSPHORUS-COMPOUNDS ; HYDROXYL RADICALS ; DIAGENETIC STATE ; DOPED TIO2 ; WATER ; DEGRADATION ; UV ; LAKE ; BIOAVAILABILITY
语种: 英语
项目资助者: Fundamental Research Funds for the Central Universities(2662016PY061) ; National Natural Science Foundation of China(41230748 ; Fok Ying Tong Education Foundation, China(151078) ; China Postdoctoral Science Foundation(2013M540619 ; 41401547) ; 2015T80855)
WOS记录号: WOS:000401556800077
ISSN号: 0048-9697
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/32102
Appears in Collections:水环境工程研究中心_期刊论文

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作者单位: 1.Huazhong Agr Univ, Coll Resources & Environm, Minist Agr, Key Lab Arable Land Conservat Middle & Lower Reac, Wuhan 430070, Peoples R China
2.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
3.North China Univ Water Resources & Elect Power, Sch Water Resources, Zhengzhou 450045, Peoples R China
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