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生态学杂志 ›› 2020, Vol. 39 ›› Issue (12): 4148-4156.doi: 10.13292/j.1000-4890.202012.009

• 研究报告 • 上一篇    下一篇

有机质和团聚体对双酚A迁移行为的影响

李仁杰1,2,杨立琼1,庄杰1,3,石亚楠1,陈希娟1*   

  1. 1中国科学院沈阳应用生态研究所, 沈阳 110016; 2中国科学院大学, 北京 100049;3田纳西大学, 诺克斯维尔TN37996, 美国)
  • 出版日期:2020-12-10 发布日期:2021-06-10

Effects of organic matter and aggregate on the transport behavior of bisphenol A

LI Ren-jie1,2, YANG Li-qiong1, ZHUANG Jie1,3, SHI Ya-nan1, CHEN Xi-juan1*   

  1. (1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2University of Chinese Academy of Sciences, Beijing 100049, China; 3Department of Biosystems Engineering and Soil Science, The University of Tennessee, Knoxville, TN 37996, USA).
  • Online:2020-12-10 Published:2021-06-10

摘要: 土壤有机质和团聚体会影响有机污染物在土壤中的吸附和迁移。本研究以双酚A(BPA)为目标污染物,用采自吉林省朝阳坡、公主岭、榆树三地的农田表层土壤,采用等温吸附实验和室内土柱迁移实验探究土壤有机质和孔隙结构对双酚A吸附和迁移的影响,为评估类似于双酚A等有机污染物对土壤及地下水的污染风险提供科学依据。结果表明:(1)双酚A在土壤中的吸附量随着土壤有机质含量的增加而增加,迁移能力与土壤有机质含量呈显著负相关(P<0.05),在有机质含量较高的榆树土壤中,双酚A的穿透率为22.5%,最大穿出相对浓度(C/C0)为0.3,而在去有机质土壤中,双酚A的穿透率为82.5%,最大穿出相对浓度(C/C0)为0.94。(2)同一土壤全土、大团聚体和微团聚体有机质差异较小,双酚A的吸附量表现为微团聚体>大团聚体>全土。双酚A在微团聚体中的迁移能力明显弱于全土和大团聚体,说明微孔结构会增加双酚A在土壤中的滞留。(3)低表面张力溶液能够从背景溶液洗脱后的土壤中再次洗脱出部分双酚A,说明疏水作用是土壤吸附双酚A的机制之一。

关键词: 双酚A, 土壤有机质, 土壤团聚体, 表面张力, 迁移

Abstract: Soil organic matter (SOM) and aggregate play a significant role in affecting adsorption and transport of organic pollutants in soil. In this study, the effects of SOM and aggregate on the adsorption and transport of bisphenol A (BPA) was investigated by isothermal adsorption experiments and soil column experiments using soils collected from the fields of Chaoyangpo, Gongzhuling, and Yushu, Jilin Province, aiming to provide scientific basis 〖JP〗for risk assessment of organic pollutants such as BPA to soil and groundwater. The results showed that: (1) The adsorption amount of BPA increased with increasing SOM content. The transport ability was significantly negatively correlated with SOM content (P<0.05). In the Yushu soil with relatively higher SOM content, the penetration rate of BPA was 22.5% and the maximum breakthrough rate (C/C0) was 0.3. In the soil with SOM being excluded, the penetration rate of BPA was 82.5% and the maximum breakthrough rate (C/C0) was 0.94. (2) The variation of SOM contents in the bulk soil, macro-aggregate and micro-aggregate of the same soil was limited. The adsorption capacity of BPA followed the order of soil microaggregate > soil macro-aggregate > bulk soil. The transport ability of BPA in soil microaggregates was significantly weaker than that in bulk soil and soil macro-aggregates, indicating that the microporous structure would increase soil BPA retention. (3) The low surface tension solution could elute part of BPA from the soil after the background solution elution, indicating that the hydrophobic effect was one of the mechanisms controlling soil BPA adsorption.

Key words: bisphenol A, soil organic matter, soil aggregate, surface tension, transport.