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题名: An investigation into the effects of silver nanoparticles on natural microbial communities in two freshwater sediments
作者: Bao, Shaopan1, 2; Wang, Han1, 2; Zhang, Weicheng1; Xie, Zhicai1; Fang, Tao1
关键词: Silver nanoparticles ; Freshwater sediment ; Enzyme activities ; Bacterial community structure
刊名: ENVIRONMENTAL POLLUTION
发表日期: 2016-12-01
DOI: 10.1016/j.envpol.2016.06.071
卷: 219, 页:696-704
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: The expanding production and usage of commercial silver nanoparticles (AgNPs) will inevitably increase their environmental release, with sediments as a substantial sink. However, little knowledge is available about the potential impacts of AgNPs on freshwater sediment microbial communities, as well as the interactions between microbial communities and biogeochemical factors in AgNPs polluted sediment. To address these issues, two different sediments: a eutrophic freshwater sediment and an oligotrophic freshwater sediment, were exposed to 1 mg/g of either AgNO3, uncoated AgNPs (35-nm and 75-nm), or polyvinylpyrrolidone coated AgNPs (PVP-AgNPs) (30-50 nm) for 45 days. High-throughput sequencing of 16S ribosomal ribonucleic acid (16S rRNA) genes using the Illumina MiSeq platform was conducted to evaluate the effects of Ag addition on bacterial community composition. Moreover, sediment microbial biomass and activity were assessed by counting cultivable bacterial number and determining enzyme activities. During the 45-day exposure, compared with no amendment control, some treatments had resulted in significant changes and alterations of sediment biomass or bacterial enzyme activities shortly. While the microbial components at phylum level were rarely affected by AgNPs addition, and as confirmed by the statistical analysis with two-factor analysis of similarities (ANOSIM), there were no significant differences on bacterial community structure across the amended treatments. Redundancy analysis further demonstrated that chemical parameters acid-volatile sulfide (AVS) and simultaneously extracted silver (SE-Ag) in sediment significantly structured the overall bacterial community in sediments spiked with various silver species. In summary, these findings suggested that the ecotoxicity of AgNPs may be attenuated by the transformation under complex environmental conditions and the self-adaption of sediment microbial communities. (C) 2016 Elsevier Ltd. All rights reserved.
关键词[WOS]: AG NANOPARTICLES ; ESTUARINE SEDIMENTS ; ACTIVATED-SLUDGE ; TOXICITY ; SOIL ; IMPACT ; BIOACCUMULATION ; TRANSFORMATION ; INVERTEBRATES ; DIVERSICOLOR
语种: 英语
项目资助者: Natural Science Foundation of China(21477159) ; Major Science and Technology Program for Water Pollution Control and Treatment(2012ZX07103-001)
WOS记录号: WOS:000390734100078
ISSN号: 0269-7491
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/28772
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, 7 Donghu South Rd, Wuhan 430072, Peoples R China
2.Grad Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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