的消化系统将聚乙烯微塑料粉碎到纳米塑料尺度
Marshall W Ritchie1, Jennifer F Provencher2, Jane E Allison1
1Department of Biology, Carleton University, Ottawa, Ontario, K1S 5B6, Canada.
Environmental pollution (Barking, Essex : 1987)
|December 17, 2023
概括
可以在消化过程中将微塑料 (MP) 分解成更小的纳米塑料. 在Gryllodes sigillatus中观察到的这种自然碎片化过程,改变了环境中的塑料污染.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 昆虫生物学 昆虫生物学
背景情况:
- 微塑料 (<5毫米) 对生态系统和生物构成重大,但尚未被充分理解的威胁.
- 一般昆虫越来越多地被认为是环境污染物的潜在载体和转化剂.
研究的目的:
- 调查一般化昆虫Gryllodes sigillatus是否可以摄入和物理降解微塑料 (MP).
- 为了确定昆虫的消化系统内MP碎片化的位置和程度.
- 评估昆虫改变微塑料污染的潜力.
主要方法:
- 养Gryllodes sigillatus的饮食中含有不同度 (0-10% w/w) 的光聚乙烯MPs.
- 剖析肠区域以隔离和分析摄入的MPs.
- 测量不同消化道部分内的MP碎片大小和数量.
主要成果:
- 虫显著分裂摄入的MPs,使颗粒大小减少约1000倍.
- 碎片化发生在消化过程的早期,不论性别或MP度.
- 没有观察到身体肠道堵塞,归因于塑料分解.
- 排泄的颗粒接近纳米塑料大小 (<1μm),表明转化.
结论:
- 像Gryllodes sigillatus这样的通用昆虫具有分裂微塑料的内在能力.
- 昆虫可以作为塑料转化剂,将MP转化为更小的纳米塑料.
- 这种生物过程有助于环境循环和塑料污染物的潜在再分配.
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