The reciprocity principle in mulch film deterioration and microplastic generation.
The reciprocity principle in mulch film deterioration and microplastic generation.
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DOI：
10.1039/d3em00402c
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发表时间：
2023-12
期刊：
影响因子：
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通讯作者：
Runhao Bai;Zhen Li;Qin Liu;Qi Liu;Jixiao Cui;Wenqing He
中科院分区：
文献类型：
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作者：
Runhao Bai;Zhen Li;Qin Liu;Qi Liu;Jixiao Cui;Wenqing He
地膜覆盖是一项全球通用的农业技术，对农业进步至关重要。然而，塑料地膜的环境退化强调了它们作为二次塑料污染物，特别是微塑料的主要来源的作用。虽然越来越多的研究引起了人们对塑料覆盖膜使用引起的微塑料污染及其环境影响的关注，但在塑料光降解驱动的过程中，关于微塑料产生的动力学和限速机制的知识差距仍然很大。此外，覆盖退化与微塑料释放和积累行为之间的关系尚未得到全面的量化。在这项研究中，建立了一个动力学方程来表征塑料覆盖膜的降解和随后的微塑料在光照射下的释放和积累。结果表明：随着辐照时间的增加，微塑料的释放速率变化呈钟形高斯分布，微塑料的累积变化呈高斯分布。当暴露时间达到μ + 3σ时，累积量达到99.7%。本研究为塑料覆盖寿命及其环境影响的前瞻性评估建立了理论框架。此外，研究结果为优化塑料覆盖设计和制定减轻微塑料污染的策略提供了有价值的见解。
Plastic film mulching stands as a globally employed agricultural technology pivotal to agricultural progress. Nevertheless, the environmental degradation of plastic mulch films underscores their role as a major source of secondary plastic pollutants, particularly microplastics. While a growing body of research has drawn attention to the rising issue of microplastic pollution and its environmental implications stemming from the use of plastic mulch films, there remains a significant knowledge gap regarding the kinetics and rate-limiting mechanisms governing the generation of microplastics during processes driven by plastic photodegradation. Moreover, a comprehensive quantification of the connection between mulch deterioration and the behavior of microplastic release and accumulation has yet to be fully realized. In this study, a kinetic equation was formulated to characterize the degradation of plastic mulch films and the subsequent release and accumulation of microplastics under light exposure. The results demonstrate that with increasing irradiation time, the change in the release rate exhibits a bell-shaped Gaussian probability distribution, while the cumulative alteration of microplastics follows a Gaussian distribution. Remarkably, once the exposure time reaches μ + 3σ, the accumulation plateaus at 99.7%. This research establishes a theoretical framework for the prospective assessment of plastic mulch lifespan and its environmental repercussions. Moreover, the findings provide valuable insights for optimizing plastic mulch design and devising strategies to mitigate microplastic pollution.