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| 微塑料对农田污染物迁移的促进作用 |
| Promoting effect of microplastics on the migration of pollutants in farmland |
| Received:May 14, 2022 Revised:July 25, 2022 |
| DOI：10.13254/j.jare.2022.0289 |
| 中文关键词: 微塑料，稻田，双酚A，镉，迁移 |
| 英文关键词: microplastics, paddy, bisphenol A, cadmium, transformation |
| 基金项目:国家自然科学基金项目（41807487）；国家级大学生创新创业训练项目（202010060009） |
| Author Name | Affiliation | E-mail | | ZHANG Haihong | School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China | | | SHI Yansong | School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China | | | CUI Wenjie | School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China | | | WANG Yudi | School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China | | | QIN Li | AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | ql-tj@163.com;端正花，duanzhenghua@mail.nankai.edu.cn | | DUAN Zhenghua | School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China | duanzhenghua@mail.nankai.edu.cn |
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| 中文摘要: |
| 为探讨微塑料（MPs）在农田系统的污染情况及可能的作用途径，以湖南省湘潭市3个镇的水稻田为研究对象，测定分析了该地区水稻田56个点位的表层土壤中MPs的分布特征，并在水稻成熟后随机选取14个点位收集稻谷，分析了MPs对土壤中双酚A（BPA）与镉（Cd）向稻谷中迁移的影响。结果表明，该地区水稻田中MPs以老化的薄膜、颗粒、碎片、纤维4种形态存在。3个镇的水稻田土壤中 MPs的丰度相似，丰度范围为 48~1 771 个·kg-1，主要成分为聚乙烯（PE）和聚氯乙烯（PVC），占比分别为 46.77% 和24.19%，且聚碳酸酯（PC）含量均显著低于苯二甲酸乙二醇酯（PET）含量，二者平均含量分别为2.51 μg·kg-1和113.35 μg·kg-1。相对于非解聚土壤，解聚土壤中 BPA含量与稻谷中的 BPA含量呈现出显著的正相关关系（P<0.01），表明随着环境中 MPs老化程度的加重，BPA有二次释放的风险。另外，土壤中Cd的含量也与MPs丰度表现出显著的正相关关系（P<0.001），表明MPs促进了Cd向稻谷中的转移。本研究对全面、客观评估农田系统中MPs的污染水平和健康风险具有参考意义。 |
| 英文摘要: |
| To investigate the pollution caused by microplastics（MPs）in agricultural systems and their possible mechanisms of action, the distribution characteristics of MPs in the surface soils of 56 sites in paddy fields of three towns in Xiangtan City, Hunan Province, China, were determined. Fourteen sites were randomly selected to collect rice grains after harvest. The effect of MPs on the migration of bisphenol A （BPA）and cadmium（Cd）from soil to rice grains were analyzed. Four forms of aging MPs were detected in soils：films, particles, fragments, and fibers. The abundance of MPs in the three towns was similar, ranging from 48 items·kg-1 to 1 771 items·kg-1; the main components were polyethylene（PE）and polyvinyl chloride（PVC）, accounting for 46.77% and 24.19%, respectively, and the content of polycarbonate（PC）was significantly lower than that of ethylene terephthalate（PET）（2.51 μg·kg-1 and 113.35 μg·kg-1, respectively）. BPA in depolymerized soils showed a more significant positive correlation with the content of BPA in rice grains than in un-depolymerized soils （P<0.01）, indicating a potential risk of secondary release of BPA during the aging of MPs in the environment. In addition, the Cd content in soils also exhibited a significant positive correlation（P<0.001）with the abundance of MPs, promoting the transformation of Cd from soils to rice grains. This study contributes to the overall and objective evaluation of the pollution and health risks posed by MPs in agricultural systems. |
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