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首页> 外文期刊>Environmental Science & Technology >Oxalic Acid in Root Exudates Enhances Accumulation of Perfluorooctanoic Acid in Lettuce
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Oxalic Acid in Root Exudates Enhances Accumulation of Perfluorooctanoic Acid in Lettuce

机译：根部中的草酸渗出蛋白增强了生菜中全氟辛酸的积累

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摘要

Perfluorooctanoic acid (PFOA) is bioaccumulative in crops. PFOA bioaccumulation potential varies largely among crop varieties. Root exudates are found to be associated with such variations. Concentrations of low-molecular-weight organic acids (LMWOAs) in root exudates from a PFOA-high-accumulation lettuce variety are observed significantly higher than those from PFOA-low-accumulation lettuce variety (p ＜ 0.05). Root exudates and their LMWOAs components exert great influences on the linear sorption-desorption isotherms of PFOA in soils, thus activating PFOA and enhancing its bioavailability. Among root exudate components, oxalic acid is identified to play a key role in activating PFOA uptake, with ＞80% attribution. Oxalic acid at rhizospheric concentrations (0.02-0.5 mM) can effectively inhibit PFOA sorption to soils by decreasing hydrophobic force, electrostatic attraction, ligand exchange, and cation-bridge effect. Oxalic acid enhances dissolution of metallic ions, iron/aluminum oxides, and organic matters from soils and forms oxalate-metal complexes, based on nuclear magnetic resonance spectra, ultraviolet spectra, and analyses of metal ions, iron/aluminum organometallic complexes, and dissolved organic carbon. The findings not only reveal the activation process of PFOA in soils by root exudates, particularly oxalic acid at rhizospheric concentrations, but also give an insight into the mechanism of enhancing PFOA accumulation in lettuce varieties.
机译：全氟辛酸（PFOA）是作物中的生物累积性。 PFOA生物累积潜力在农作物品种中变化很大。发现根出渗出物与这种变化有关。从PFOA高积聚莴苣品种的根部渗出物中的低分子量有机酸（LMWOA）的浓度明显高于PFOA-LOW积累莴苣品种（P <0.05）。根出渗出物及其LMWOAs组分对土壤中PFOA的线性吸附解吸等温度发挥着巨大影响，从而激活PFOA并提高其生物利用度。在根除渗透物组分中，鉴定草酸在激活PFOA摄取方面发挥关键作用，具有> 80％的归因。通过降低疏水力，静电吸引力，配体交换和阳离子桥效应，脱静脉浓度（0.02-0.5mm）以脱钻浓度（0.02-0.5mm）的草酸可有效抑制对土壤的PFOA吸附。草酸增强了土壤中金属离子，铁/氧化铝和有机物质的溶解，并基于核磁共振谱，紫外光谱和金属离子，铁/铝有机金属配合物分析和溶解有机物的溶解 - 金属络合物碳。结果不仅揭示了根除渗滤物，特别是根茎浓度的土壤中PFOA在土壤中的活化过程，而且还熟悉增强莴苣品种中PFOA积累的机制。

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  • 来源
    《Environmental Science & Technology》 |2020年第20期|13046-13055|共10页
  • 作者

    Lei Xiang; Xiao-Ting Chen; Peng-Fei Yu; Xin-Hong Li; Hai-Ming Zhao; Nai-Xian Feng; Yan-Wen Li; Hui Li; Quan-Ying Cai; Ce-Hui Mo; Qing X. Li;

  • 作者单位

    Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials College of Life Science and Technology Jinan University Guangzhou 510632 China Department of Molecular Biosciences and Bioengineering University of Hawaii at Manoa Honolulu Hawaii 96822 United States;

    Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials College of Life Science and Technology Jinan University Guangzhou 510632 China;

    Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials College of Life Science and Technology Jinan University Guangzhou 510632 China;

    Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials College of Life Science and Technology Jinan University Guangzhou 510632 China;

    Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials College of Lift Science and Technology Jinan University Guangzhou 510632 China;

    Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials College of Life Science and Technology Jinan University Guangzhou 510632 China;

    Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials College of Life Science and Technology Jinan University Guangzhou 510632 China;

    Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials College of Life Science and Technology Jinan University Guangzhou 510632 China;

    Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials College of Life Science and Technology Jinan University Guangzhou 510632 China;

    Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials College of Life Science and Technology Jinan University Guangzhou 510632 China;

    Department of Molecular Biosciences and Bioengineering University of Hawaii at Manoa Honolulu Hawaii 96822 United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    perfluorinated alkyl substance; PFAS; bioavailability; root exudate; desorption; bioaccumulation; food safety;

    机译：全氟化烷基物质;PFA;生物利用度;根渗出;解吸;生物累积;食品安全;

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