赵雪君, 李达, 刘士领, 王鸣华. 聚酰胺和聚甲基丙烯酸甲酯微塑料对异菌脲土壤环境行为的影响[J]. 农药学学报, 2021, 23(5): 986-994. DOI: 10.16801/j.issn.1008-7303.2021.0090
    引用本文: 赵雪君, 李达, 刘士领, 王鸣华. 聚酰胺和聚甲基丙烯酸甲酯微塑料对异菌脲土壤环境行为的影响[J]. 农药学学报, 2021, 23(5): 986-994. DOI: 10.16801/j.issn.1008-7303.2021.0090
    ZHAO Xuejun, LI Da, LIU Shiling, WANG Minghua. Effects of polyamide and polymethyl methacrylate microplastics on environmental behaviors of iprodione in soil[J]. Chinese Journal of Pesticide Science, 2021, 23(5): 986-994. DOI: 10.16801/j.issn.1008-7303.2021.0090
    Citation: ZHAO Xuejun, LI Da, LIU Shiling, WANG Minghua. Effects of polyamide and polymethyl methacrylate microplastics on environmental behaviors of iprodione in soil[J]. Chinese Journal of Pesticide Science, 2021, 23(5): 986-994. DOI: 10.16801/j.issn.1008-7303.2021.0090

    聚酰胺和聚甲基丙烯酸甲酯微塑料对异菌脲土壤环境行为的影响

    Effects of polyamide and polymethyl methacrylate microplastics on environmental behaviors of iprodione in soil

    • 摘要: 微塑料可以吸附环境中的有机污染物,可能会影响农药在土壤中的降解、吸附和迁移等环境行为,其影响与微塑料和农药的类型有关。为明确微塑料对异菌脲在土壤中环境行为的影响,通过室内模拟试验,研究了聚酰胺 (PA) 和聚甲基丙烯酸甲酯 (PMMA) 微塑料对异菌脲在土壤中吸附、迁移、淋溶和降解的影响。研究结果表明:含2% (质量分数,下同) PMMA土壤和含2% PA土壤的土壤吸附常数 (Kf) 分别是对照土壤的2.9倍和1.2倍;在pH 4 ~ 7范围内,土壤对异菌脲的吸附容量随pH值的增加而增加;异菌脲在对照土壤、含2% PA土壤、含2% PMMA土壤中的比移值 (Rf) 分别为0.12、0.097和0.091,在第一段土柱中的含量分别为85.4%、100%和100%;异菌脲在对照土壤、含2% PA土壤和含2% PMMA土壤中的降解半衰期分别为19.8、26.7和40.8 d。研究表明,微塑料通过提高土壤对农药异菌脲的吸附能力,抑制了异菌脲在土壤中的迁移和淋溶,延长了其在土壤中的降解半衰期,因而可能会加剧其对表层土壤环境的威胁。

       

      Abstract: Organic pollutants in the environment may be absorbed by microplastics, which may affect the degradation, adsorption and migration of pesticides in soil. The impact is related to the types of microplastics and pesticides. To clarify the effects of microplastics on the environmental behavior of iprodione in soil, the impacts of microplastic of polyamide (PA) and polymethyl methacrylate (PMMA) on the adsorption, migration, leaching and degradation of iprodione in soil were investigated under simulated indoor conditions. The results showed that the soil sorption constants (Kf) of soil with 2% PMMA and soil with 2% PA were 2.9 and 1.2 times higher than those of the control soil, respectively. The adsorption capacity of soil for iprodione increased with the increase of pH in the range of pH 4-7. The Rf values of iprodione in the control soil, soil with 2% PA and soil with 2% PMMA were 0.12, 0.097 and 0.091, respectively. The concentration of iprodione in the first soil column of the control soil, soil with 2% PA and soil with 2% PMMA were 85.4%, 100% and 100%, respectively. The degradation half-lives of iprodione in the control soil, soil with 2% PA and soil with 2% PMMA were 19.8, 26.7 and 40.8 d, respectively. Microplastics reduced the mobility and prolonged the soil degradation half-life of iprodione by enhancing the soil sorption capacity of iprodione, which aggravated the threat of pesticide to the surface soil environment.

       

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