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学科主题: Engineering, Environmental; Environmental Sciences
题名: Mechanisms and Factors Affecting Sorption of Microcystins onto Natural Sediments
作者: Wu, Xingqiang1, 2; Xiao, Bangding1; Li, Renhui1; Wang, Chunbo1, 3; Huang, Jiantuan1, 3; Wang, Zhi1, 3
通讯作者: Xiao, BD, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China ; bdxiao@ihb.ac.cn
关键词: LAKE-SEDIMENTS ; CYANOBACTERIAL HEPATOTOXINS ; BATCH EXPERIMENTS ; ORGANIC-MATTER ; REMOVAL ; LR ; SOILS ; MONTMORILLONITE ; FLOCCULATION ; COAGULATION
刊名: ENVIRONMENTAL SCIENCE & TECHNOLOGY
发表日期: 2011-04-01
DOI: 10.1021/es103729m
卷: 45, 期:7, 页:2641-2647
收录类别: SCI
文章类型: Article
部门归属: [Wu, Xingqiang; Xiao, Bangding; Li, Renhui; Wang, Chunbo; Huang, Jiantuan; Wang, Zhi] Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China; [Wu, Xingqiang] Chinese Acad Sci, NE Inst Geog & Agroecol, Changchun 130012, Peoples R China; [Wang, Chunbo; Huang, Jiantuan; Wang, Zhi] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
WOS标题词: Science & Technology ; Technology ; Life Sciences & Biomedicine
资助者: National Key Project for Basic Research [2008CB418101]; National Natural Science Foundation of China [41001326]; National High Technology Research and Development Program of China [2007AA06Z304]
类目[WOS]: Engineering, Environmental ; Environmental Sciences
研究领域[WOS]: Engineering ; Environmental Sciences & Ecology
摘要: The sorption of microcystins (MCs) to fifteen lake sediments and four clay minerals was studied as a function of sediment/clay properties, temperature, and pH through well-controlled batch sorption experiments. All sorption data for both sediments and clays are well described by a nonlinear Freundlich model (n(f) varies between 0.49 and 1.03). The sorption process for MCs exhibited different adsorptive mechanisms in different lake sediments mainly dependent on the sediment organic matter (OM). For sediments with lower OM (i.e., less than 8%), the sorption of MCs decreases with increasing OM and is dominated by the competition for adsorption sites between MCs and OM. In contrast, MC sorption to organic-rich (i.e., more than 8%) sediments increases with increasing OM and is dominated by the interaction between MCs and adsorbed OM. The sorption thermodynamics of MCs onto sediments showed that MC sorption is a spontaneous physisorption process with two different mechanisms. One mechanism is an exothermic process for sediment with lower OM, and the other is an endothermic process for sediment with higher OM. Furthermore, the sorption of MCs onto sediments is pH dependent (sorption decreased with increasing pH). These results provide valuable informations for a better understanding of the natural abiotic attenuation mechanisms for MCs in aquatic ecosystems.
英文摘要: The sorption of microcystins (MCs) to fifteen lake sediments and four clay minerals was studied as a function of sediment/clay properties, temperature, and pH through well-controlled batch sorption experiments. All sorption data for both sediments and clays are well described by a nonlinear Freundlich model (n(f) varies between 0.49 and 1.03). The sorption process for MCs exhibited different adsorptive mechanisms in different lake sediments mainly dependent on the sediment organic matter (OM). For sediments with lower OM (i.e., less than 8%), the sorption of MCs decreases with increasing OM and is dominated by the competition for adsorption sites between MCs and OM. In contrast, MC sorption to organic-rich (i.e., more than 8%) sediments increases with increasing OM and is dominated by the interaction between MCs and adsorbed OM. The sorption thermodynamics of MCs onto sediments showed that MC sorption is a spontaneous physisorption process with two different mechanisms. One mechanism is an exothermic process for sediment with lower OM, and the other is an endothermic process for sediment with higher OM. Furthermore, the sorption of MCs onto sediments is pH dependent (sorption decreased with increasing pH). These results provide valuable informations for a better understanding of the natural abiotic attenuation mechanisms for MCs in aquatic ecosystems.
关键词[WOS]: LAKE-SEDIMENTS ; CYANOBACTERIAL HEPATOTOXINS ; BATCH EXPERIMENTS ; ORGANIC-MATTER ; REMOVAL ; LR ; SOILS ; MONTMORILLONITE ; FLOCCULATION ; COAGULATION
语种: 英语
WOS记录号: WOS:000288841500023
ISSN号: 0013-936X
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/15648
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.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
2.Chinese Acad Sci, NE Inst Geog & Agroecol, Changchun 130012, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Wu, Xingqiang; Xiao, Bangding; Li, Renhui; Wang, Chunbo; Huang, Jiantuan; Wang, Zhi.Mechanisms and Factors Affecting Sorption of Microcystins onto Natural Sediments,ENVIRONMENTAL SCIENCE & TECHNOLOGY,2011,45(7):2641-2647
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