Kinetics of microplastic generation from different types of mulch films in agricultural soil

文献类型： 外文期刊

第一作者： Yang, Yang

作者： Yang, Yang;Li, Zhen;Yan, Changrong;Liu, Enke;Liu, Qin;Bai, Runhao;He, Wenqing;Li, Zhen;Yan, Changrong;Liu, Qin;He, Wenqing;Chadwick, Dave;Jones, Davey L.;Chadwick, Dave;Jones, Davey L.

作者机构：

关键词： Mulch film; Microplastic generation; UV irradiation; Emission kinetics; Schwarzchild's principle

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 814 卷

页码：

收录情况： SCI

摘要： Upon environmental weathering, plastic materials form smaller sized microplastics, of which the contamination in agricultural fields is of significant importance and increasing social concern. Plastic mulch films are considered a major source of agricultural soil microplastic pollution. However, the mechanism and kinetics of microplastic formation from plastic mulch films were rarely understood. In this study, the rate of microplastic generation from typical mulch films, such as oxodegradable, biodegradable, and conventional non-degradable (polyethylene, PE) mulch films, were quantified in soil under simulated UV irradiation. Results showed that microplastic formation was more rapid from biodegradable mulch film, followed sequentially by oxodegradable mulch film, white PE mulch film, and black PE mulch film. The kinetics of microplastic generation strictly followed the Schwarzchild's law, with exponential growth at indexes between 1.6309 and 2.0502 in the microplastic generation model. At a cumulative UV irradiation of 2.1 MJ/m(2), the average quantity of microplastics released from biodegradable, oxodegradable, and white and black non-degradable mulch films were 475, 266, 163, 147 particles/cm(2), respectively; with particle sizes largely distributed within 0.02-0.10 mm range. Concurrent increase in crystallinity and surface erosion of the mulch films were observed upon UV irradiation, which further determined the accessibility and activity of the materials to photo-oxidation (reflected as HI indexes), therefore played a critical role on the quantity and size ranges of microplastic debris.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序