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Xinyu Li¹, Yi Kong¹, Albert L Juhasz²

¹State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.

Environmental science & technology

|August 17, 2023

概括

土壤中的微塑料 (MP) 可以充当疏水性有机化合物 (HOC) 的来源,清洁剂或沉降器. 不同的MP类型 (LDPE,PLA,PS) 根据它们与土壤和污染物的相互作用,显著改变了多双 (PCB) 的生物可用性.

科学领域:

环境科学环境科学
环境化学环境化学
毒理学毒理学毒理学

背景情况:

微塑料 (MP) 是越来越普遍的环境污染物.
国会议员可以与土壤中的疏水性有机化合物 (HOC) 相互作用,影响它们的环境命运和生物可用性.
了解这些相互作用对于评估MP和共同污染物的生态风险至关重要.

研究的目的:

研究三种常见的MP类型 - - 低密度聚乙烯 (LDPE),聚乳酸 (PLA) 和聚烯 (PS) - - 在改变多化双 (PCB) 的生物利用性方面的作用.
为了确定MP是否在不同的暴露场景下充当PCB的来源,清洁剂或沉降剂.
评估MP类型和土壤-MP-PCB平衡对PCB相对生物利用率 (RBA) 的影响.

主要方法:

用小鼠模型来测量PCB的相对生物利用率 (RBA).
在不同类型的MP上吸收的PCB被给予小鼠,以评估MP作为PCB的"来源".
为了评估其作为"清洁剂"的作用及其在老化后作为"水槽"的长期效果,MPs被添加到10%度的PCB污染土壤中.

主要成果:

当作为"来源"时,MP吸收的PCB在脂肪组织中呈现出不同的积累,其中LDPE具有最高的PCB RBA (101%).
与对照组相比,将10%的MP添加到受PCB污染的土壤中显著降低了PCB RBA,这表明MP通过吸附PCB而充当"清洁剂".
议员们证明了老污染土壤中PCB的"沉降"效应,LDPE表现出比PLA和PS更明显的效应.

结论:

在HOC生物可用性中MP的作用是复杂的,取决于MP类型和MP,土壤和HOC之间的平衡状态.
作为PCB的来源,清洁剂和沉降器,LDPE,PLA和PS表现出不同的行为,这突显了MP特征在环境风险评估中的重要性.
国会议员可以显著改变像PCB这样的持久有机污染物的生物可用性,需要进一步研究它们对环境的影响.

关键词:

有关高氧化物暴露的风险生物可用性生物可用性微塑料微塑料的使用土壤土壤土壤土壤土壤

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