在农田中由可生物降解皮膜形成的巨型塑料和微型塑料的动力学
Shitong Li1, Fan Ding1, Markus Flury2
1College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China.
The Science of the total environment
|June 10, 2023
概括
随着时间的推移,土壤生物降解塑料 (BDM) 分解为宏观和微型塑料. 虽然巨型塑料在2.5年内消失,但微型塑料水平下降,这表明最终完全生物降解.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 聚合物科学 聚合物科学
背景情况:
- 传统的塑料覆盖物使用导致大量的塑料废物.
- 土壤生物降解塑料土 (BDM) 提供了一个可持续的替代方案,在收获后耕种到土壤中.
- 在自然环境中完全降解BDM的证据有限.
研究的目的:
- 在四年内量化土壤中BDM的宏观和微型塑料的命运.
- 评估基于聚乙烯基酸盐-协同甲酸盐 (PBAT) 和聚乳酸 (PLA) 的BDMs的降解动态.
- 评估BDM在农业环境中完全生物降解的潜力.
主要方法:
- 在一次BDM应用后,一项实地研究跟踪了四年内宏观和微型塑料度.
- 测试了透明和黑色的BDM配方.
- 开发并使用了一种新的顺序密度分成方法 (H2O和ZnCl2) 来提取微塑料.
主要成果:
- BDM薄膜降解为宏观和微型塑料.
- 所有巨型塑料 (>5毫米) 在结合后2.5年消失.
- 微塑料度显著下降,从2.5年后的350-525颗粒/公斤降至3.5年后的50-125颗粒/公斤.
结论:
- 观察到的宏观和微型塑料度的下降表明BDM的逐渐降解.
- BDM似乎分裂成更小的颗粒,可能导致完全生物降解.
- 需要进一步的研究来确认没有持久纳米塑料.
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