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Impact of Polymer Colonization on the Fate of Organic Contaminants in Sediment

机译：聚合物定殖对沉积物中有机污染物命运的影响

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摘要

Plastic pellets and microbes are important constitutes in sediment, but the significance of microbes colonizing on plastic pellets to the environmental fate and transport of organic contaminants has not been adequately recognized and assessed. To address this issue, low-density polyethylene (LDPE), polyoxy- methylene (POM) and polypropylene (PP) slices were preloaded with dichlorodiphenyltrichloroethanes (DDTs), polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) and incubated in abiotic and biotic sediment microcosms. Images from scanning electron microscope, Lysogeny Broth agar plates and confocal laser scanning microscope indicated that all polymer slices incubated in biotic sediments were colonized by microorganisms, particularly the LDPE slices. The occurrence of biofilms induced higher dissipation rates of DDTs and PAHs from the LDPE slice surfaces incubated in the biotic sediments than in the abiotic sediments. Plastic colonization on LDPE slice surfaces enhanced the biotransformation of DDT and some PAHs in both marine and river sediments, but had little impact on PCBs. By comparison, PP and POM with unique properties were shown to exert different impacts on the physical and microbial activities as compared to LDPE. These results clearly demonstrated that the significance of polymer surface affiliated microbes to the environmental fate and behavior of organic contaminants should be recognized.
机译：塑料颗粒和微生物是沉积物中的重要成分，但是微生物在塑料颗粒上定植对环境命运和有机污染物运输的重要性尚未得到充分认识和评估。为解决此问题，在低密度聚乙烯（LDPE），聚甲醛（POM）和聚丙烯（PP）切片中预装了二氯二苯基三氯乙烷（DDT），多环芳烃（PAH）和多氯代联苯（PCB），并在非生物和生物沉积物缩影。来自扫描电子显微镜，Lysogeny Broth琼脂平板和共聚焦激光扫描显微镜的图像表明，在生物沉积物中孵育的所有聚合物切片均被微生物定殖，特别是LDPE切片。生物膜的出现导致在生物沉积物中培养的LDPE切片表面的DDT和PAH消散速率高于非生物沉积物中。 LDPE切片表面的塑料定植增强了海洋和河流沉积物中DDT和某些PAH的生物转化，但对PCB的影响很小。相比之下，与LDPE相比，具有独特性能的PP和POM对物理和微生物活性的影响不同。这些结果清楚地表明，应该认识到聚合物表面相关微生物对环境命运和有机污染物行为的重要性。

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  • 来源
    《Environmental Science & Technology》 |2017年第18期|10555-10561|共7页
  • 作者

    Chen-Chou Wu; Lian-Jun Bao; Liang-Ying Liu; Lei Shi; Shu Tao; Eddy Y. Zeng;

  • 作者单位

    School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China;

    School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China;

    School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China;

    School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China;

    Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing 100871, China;

    School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China;

  • 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);
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