生态与农村环境学报 ›› 2017, Vol. 33 ›› Issue (5): 385-395.doi: 10.11934/j.issn.1673-4831.2017.05.001

• 专论与综述 • 上一篇    下一篇

环境中可电离有机化合物生物有效性研究进展

徐世积1, 何影1, 李思齐1, 刘开林1,2, 刘祥英1,2, 周小毛1,2, 柏连阳1,2   

  1. 1. 湖南农业大学植物保护学院, 湖南 长沙 410128;
    2. 湖南省农田杂草防控技术与应用协同创新中心, 湖南 娄底 417000
  • 收稿日期:2016-05-16 出版日期:2017-05-25 发布日期:2017-05-25
  • 通讯作者: 刘开林,E-mail:kailin@hunau.net E-mail:kailin@hunau.net
  • 作者简介:徐世积(1995-),男,湖南岳阳人,本科生,研究方向为农药环境毒理学。E-mail:1950163095@qq.com
  • 基金资助:

    国家自然科学基金(41301568);湖南农业大学大学生创新性实验计划项目(XCX1587)

Review of Researches on Bioavailability of Ionizable Organic Compounds in Environment

XU Shi-ji1, HE Ying1, LI Si-qi1, LIU Kai-lin1,2, LIU Xiang-ying1,2, ZHOU Xiao-mao1,2, BAI Lian-yang1,2   

  1. 1. College of Plant Protection, Hunan Agricultural University, Changsha 410128, China;
    2. Collaborative Innovation Center of Farmland Weeds Control, Loudi 417000, China
  • Received:2016-05-16 Online:2017-05-25 Published:2017-05-25

摘要:

随着人工合成化合物的增加,可电离有机化合物(ionizable organic compounds,IOCs)所占比例越来越大。由于IOCs在环境pH范围内可能以分子或离子形式存在,其在环境中的生物有效性具有特殊性。主要从物理化学吸附和生物对IOCs的吸收2个过程综述环境中IOCs生物有效性的影响因素,环境介质吸附IOCs主要受环境pH的影响,通常中性分子比离子态分子更易被环境吸附。IOCs对生物的有效性主要取决于IOCs在环境中的电离程度和生物对其富集因子。根据离子障理论,中性分子相比于离子态分子更容易穿透细胞膜,一旦化合物进入生物膜内,IOCs是否具有生物有效性取决于细胞质内pH,细胞内部影响浓度与外界环境pH无关。与生物监测和模型监测等方法相比,中空纤维液相微萃取技术更能有效地用于评估IOCs的生物有效性。在未来对IOCs的生物有效性研究中,应更加注意环境介质pH和生物体内pH的影响。

关键词: 可电离有机化合物, 生物有效性, 土壤吸附, 生物吸收

Abstract:

With the development of the chemical industry, an increasing proportion of synthetic organic compounds detected today in the environment are ionizable. As ionizable organic compounds (IOCs) may exist in the form of molecules and/or ions in the environment, their bioavailabilities in the environment are site-specific. Factors affecting IOCs bioavailabilities in the environment mainly from the angle of their physicochemical adsorption and biological absorption are elaborated. IOCs adsorption to environmental media is mainly influenced by pH. Generally, neutral molecules are more easily absorbed by the medium than ionized ones. Bioavailability of IOCs depends on ionization degree of these compounds and bioaccumulation factor. According to the theory of ion trap, neutral molecules can penetrate plasma membranes more easily than ionized ones. Once neutral molecules enter into cell, the bioavailability of IOCs depends on pH of the cytoplasm, and the effect inside the cells has nothing to do with pH in the outside environment. Compared with the techniques of biological monitoring and model monitoring, the technique of hollow fiber liquid microextraction is more efficient in evaluating bioavailability of IOCs. Besides, in future studies on bioavailability of IOCs, more emphasis should be laid on influences of pH of the environmental media and pH inside the cells.

Key words: inoizable organic compound, bioavailability, soil adsorption, biological absorption

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