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Effects of cationic surfactant on the bioaccumulation of polycyclic aromatic hydrocarbons in rice and the soil microbial community structure

机译：阳离子表面活性剂对水稻土壤和土壤微生物群体的多环芳烃生物累积的影响

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摘要

Cationic surfactants have been proposed as adsorbents for the remediation of aerobic agricultural soils contaminated with polycyclic aromatic hydrocarbons (PAHs). However, the effects of cationic surfactants on the bioavailability of PAHs in paddy soils and on the soil microbial community structure have not been investigated. In this study, cetyltrimethylammonium bromide (CTMAB) was added into an anaerobic PAH-contaminated soil planted with rice (Oryza sativa L.). After harvest, the addition of 150 mg kg(-1) CTMAB significantly reduced the bioavailability of PAHs in the soil and thus the bioaccumulation of PAHs from the soil into the rice roots. Based on the results of Tenax extraction, when applied at appropriate concentrations, CTMAB retarded the PAH desorption from the soil. The above effectiveness of CTMAB was better for high-molecular-weight PAHs (four to six benzene rings) than low-molecular-weight PAHs (two to three benzene rings). Amendment with CTMAB increased the bacterial diversity, species richness, and most of the bacterial phyla (especially involving Acidobacteria and Firmicutes) in the soils (p < 0.05). The contents of organic matter, ammonium nitrogen, and bioavailable PAH concentrations were the top three soil attributes that influenced the bacterial community structure in paddy soils amended with CTMAB. This study indicates that CTMAB applied at appropriate levels, can effectively reduce the environmental risk of PAHs in rice production, primarily via immobilization, and benefit the soil microbial ecology in the short term.
机译：已经提出了阳离子表面活性剂作为治疗有氧农业土壤污染的有氧农业土壤的吸附剂（PAHS）。然而，阳离子表面活性剂对水稻土壤和土壤微生物群落结构中PAH的生物利用度的影响尚未得到研究。在本研究中，将甲苯基三甲基溴化铵（CTMAB）加入到水稻（Oryza Sativa L.）种植的厌氧PAH污染的土壤中。收获后，添加150mg kg（-1）ctmab显着降低了土壤中PAH的生物利用度，从而将PAH的生物累积从土壤中的生物累积到稻根中。基于Tenax提取的结果，当以适当浓度施用时，CTMAB延迟了来自土壤的PAH解吸。 CTMAB的上述有效性对于高分子量PAHs（四至六个苯环）优于低分子量PAH（两至三个苯环）。含CTMAB的修正案增加了细菌多样性，物种丰富性，以及土壤中的大部分细菌植物（特别是涉及抗癌杀菌剂和致癌）（P <0.05）。有机物质，氮和生物可利用的PAH浓度的含量是含有CTMAB修正的水稻土中的细菌群落结构的前三种土壤。本研究表明，CTMAB应用于适当水平，可以有效降低水稻生产中PAH的环境风险，主要通过固定化，并在短期内有利于土壤微生物生态学。

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  • 来源
    《RSC Advances》 |2017年第66期|共8页
  • 作者

    Ni Ni; Wang Fang; Song Yang; Shi Renyong; Jia Mingyun; Bian Yongrong; Jiang Xin;

  • 作者单位

    Chinese Acad Sci Inst Soil Sci Key Lab Soil Environm &

    Pollut Remediat Nanjing 210008 Jiangsu Peoples R China;

    Chinese Acad Sci Inst Soil Sci Key Lab Soil Environm &

    Pollut Remediat Nanjing 210008 Jiangsu Peoples R China;

    Chinese Acad Sci Inst Soil Sci Key Lab Soil Environm &

    Pollut Remediat Nanjing 210008 Jiangsu Peoples R China;

    Chinese Acad Sci Inst Soil Sci Key Lab Soil Environm &

    Pollut Remediat Nanjing 210008 Jiangsu Peoples R China;

    Chinese Acad Sci Inst Soil Sci Key Lab Soil Environm &

    Pollut Remediat Nanjing 210008 Jiangsu Peoples R China;

    Chinese Acad Sci Inst Soil Sci Key Lab Soil Environm &

    Pollut Remediat Nanjing 210008 Jiangsu Peoples R China;

    Chinese Acad Sci Inst Soil Sci Key Lab Soil Environm &

    Pollut Remediat Nanjing 210008 Jiangsu Peoples R China;

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