寒冷气候地区农用聚乙烯薄膜的风化:哪些参数会影响碎裂?

IF 3.5 Q3 ENGINEERING, ENVIRONMENTAL
Laura Rowenczyk, Heidi Jahandideh, Nicholas Lin and Nathalie Tufenkji
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引用次数: 0

摘要

塑料农用地膜可用于提高耕地的生产力;然而,它们的风化和破碎可能会导致微塑料和纳米塑料的释放,而这两种物质都被认为是潜在的健康和环境危害。在这项研究中,我们考察了各种塑料地膜在经历不同风化过程后物理和化学特性的变化。为此,我们在以下风化条件下对三种市售聚乙烯地膜(一种透明膜和两种深色膜)进行了评估:评估湿度、紫外线照射、pH 值和冻融影响的实验室处理,以及寒冷气候地区的自然风化条件。我们系统地研究了聚乙烯薄膜在受控和自然风化条件下的形态和理化特性。这三种薄膜(其中一种在市场上被称为抗紫外线薄膜)都发生了显著的变化。所有风化薄膜的表面粗糙度都有所增加,这表明这可能是微塑料或纳米塑料的来源。虽然抗紫外线薄膜中的深色颜料在一定程度上保护了薄膜免受紫外线氧化,但它们并不能防止其他类型的风化(如潮湿、冻融或自然风化)造成的劣化。这项研究的结果为了解聚乙烯薄膜在冬季和寒冷气候条件下碎裂成微塑料提供了启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Weathering of agricultural polyethylene films in cold climate regions: which parameters influence fragmentation?†

Weathering of agricultural polyethylene films in cold climate regions: which parameters influence fragmentation?†

Plastic agricultural mulch films are used to improve the productivity of cultivable fields; however, their weathering and fragmentation could lead to release of microplastics and nanoplastics, both of which are considered potential health and environmental hazards. In this study, we examined the changes in physical and chemical properties of various plastic mulch films as they underwent different weathering processes. For this purpose, three commercially available polyethylene mulch films (one clear and two dark films) were evaluated under the following weathering conditions: laboratory treatments to evaluate the impacts of moisture, ultraviolet irradiation, pH, and freeze–thaw, as well as natural weathering conditions of a cold climate region. The morphologies and physicochemical properties of the polyethylene films were systematically studied following exposure to controlled and natural weathering. The three films, one of which was marketed as UV-resistant, underwent significant modifications. All weathered films were found to have increased surface roughness, suggesting that this could be the origin of microplastics or nanoplastics. While the dark pigments in the UV-resistant film protected the film against UV oxidation to some degree, they did not prevent deterioration caused by other types of weathering such as moisture, freeze–thaw, or natural weathering. The results of this study provide insights to understanding the fragmentation of polyethylene films into microplastics in winter and cold climate conditions.

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