叶子吸收有助于植物中的微塑料积累
Ye Li1, Junjie Zhang1, Li Xu2
1MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin, P. R. China.
Nature
|April 9, 2025
概括
大气中的微塑料被植物的叶子吸收,进入食物链. 这项研究证实了植物中聚乙烯二甲 (PET) 和聚乙烯 (PS) MPs的广泛吸收,强调了环境暴露的重要途径.
科学领域:
- 环境科学
- 植物生物学
- 毒理学
背景情况:
- 植物根吸收陆地微塑料 (MP),但转移速度很慢.
- 大气中的MPs很常见,但植物直接吸收的证据有限.
研究的目的:
- 研究植物叶子直接吸收大气中的微塑料.
- 量化植物组织中的微塑料积累,并确定吸收途径.
主要方法:
- 质谱检测叶子中的聚乙烯二甲 (PET) 和聚烯 (PS) 聚合物和寡合物.
- 超光谱成像和原子力显微镜-红外光谱用于纳米尺寸粒子可视化.
- 聚焦显微镜和激光剥离感应合的等离子体质谱法,以追踪玉米 (Zea mays L.) 中的颗粒吸收和转移.
主要成果:
- 在植物叶子中广泛存在PET和PS聚合物和寡合物,随着大气度的增加而增加.
- 在高污染地区检测叶子中的纳米尺寸PET和PS颗粒,其度高达10^4 ng/g干重.
- 玉米叶子通过口腔吸收塑料颗粒,转移到血管组织,并在三体中积累.
结论:
- 植物叶子吸收和积累大气中的微塑料是一种广泛的环境现象.
- 这一途径对于评估人类和生物暴露在微塑料中至关重要.
- 这些发现需要对环境微塑料风险评估进行重新评估.
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