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Comparison of the effects of continuous and accumulative exposure to nanoplastics on microalga Chlorella pyrenoidosa during chronic toxicity

机译:比较慢性毒性微藻菌纳米蛋白酶纳米菌纳塑性

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摘要

Most previous studies have focused on the continuous exposure of aquatic organisms to nanoplastics. However, persistent pollutants in natural aquatic surroundings are a threat, and their concentrations are continuously increasing. The discussion and research into the effects of accumulative exposure to these materials are limited. Therefore, this study aimed to compare the effects of continuous and accumulative exposure to polystyrene (PS) nanoplastics (80 nm) on Chlorella pyrenoidosa during chronic toxicity. The results indicated that under conditions of continuous exposure, this alga exhibited self-recovery to defend against the negative effects of PS nanoplastics during 15-21 days of exposure (the 21-d inhibitory rate was 1.41%). However, one unanticipated finding was that during the same period of accumulative exposure, nanoplastics retained a substantial and stable inhibitory effect on the algal growth (the 21-d inhibitory rate was 6.79% in accumulative exposure for twice), indicating the invalid self-recovery of algae. The results of scanning electron microscopy demonstrated that on day 21, the degree of damage to the algal cells under accumulative exposure was more severe than that under continuous exposure. Hence, nanoplastics exerted an irreversibly negative effect on aquatic organisms depending on the pattern, frequency, concentration, and duration of exposure. This project evaluated the practical significance of nanoplastics in aquatic ecosystems.
机译:最先前的研究侧重于水生生物的持续暴露于纳米塑料。然而,天然水生环境中的持续污染物是一种威胁,它们的浓度不断增加。累计暴露对这些材料的讨论和研究是有限的。因此,该研究旨在比较慢性毒性期间Collowla Pyrenoidos对小球藻芘(80nm)的连续和累积暴露于聚苯乙烯(PS)纳米型(80nm)的影响。结果表明,在连续暴露的条件下,该藻类表现出自我恢复,以防止在15-21天暴露的15-21天内pS纳米塑料的负面影响(21d抑制率为1.41%)。然而,一个意外的发现是在同一时期的累积暴露时期,纳米血泡对藻类生长保留了大量且稳定的抑制作用(21d抑制率为6.79%,累积暴露两次),表明无效的自我恢复藻类。扫描电子显微镜的结果证明,在第21天,在累积暴露下对藻类细胞的损伤程度比连续暴露在不断暴露下的损伤程度更严重。因此,根据曝光的图案,频率,浓度和持续时间,纳米纳塑料对水生生物产生不可逆转的负面影响。该项目评估了纳米塑料在水生生态系统中的实际意义。

著录项

  • 来源
    《Science of the total environment》 |2021年第20期|147934.1-147934.10|共10页
  • 作者单位

    School of Resource and Environmental Sciences Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory Wuhan University Wuhan Hubei 430079 PR China;

    Key Laboratory of Molecular Biophysics of Ministry of Education College of Life Science and Technology Huazhong University of Science and Technology Wuhan Hubei 430074 PR China;

    School of Resource and Environmental Sciences Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory Wuhan University Wuhan Hubei 430079 PR China;

    School of Resource and Environmental Sciences Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory Wuhan University Wuhan Hubei 430079 PR China;

    School of Resource and Environmental Sciences Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory Wuhan University Wuhan Hubei 430079 PR China;

    School of Resource and Environmental Sciences Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory Wuhan University Wuhan Hubei 430079 PR China;

    Jiangxi Provincial Key Laboratory of Water Resources and Environment of Poyang Lake Jiangxi Institute of Water Sciences Nanchang Jiangxi 330029 PR China;

    School of Resource and Environmental Sciences Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory Wuhan University Wuhan Hubei 430079 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nanoplastics; Microalgae; Chronic toxicity; Continuous exposure; Accumulative exposure;

    机译:纳米塑料;微藻;慢性中毒;连续曝光;累积曝光;

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