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Peer reviewed
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Song, Wenhui; Du, Yankun; Li, Dengtan; Xiao, Zongyuan; Li, Bing; Wei, Jinling; Huang, Xinjie; Zheng, Chuanwei; Wang, Jinhua; Wang, Jun; Zhu, Lusheng
Journal of hazardous materials, 08/2023, Volume: 455Journal Article
Microplastics (MPs) may significantly affect the bioavailability of coexisting pollutants in soil by adsorption-desorption behavior. However, the mechanisms underlying these interaction remain unclear. Herein, the influence of unused polythylene mulch film-derived MPs (MFMPs) and farmland residual polyethylene mulch film-derived MPs (MFMPs-aged) on the adsorption-desorption behavior and bioavailability of atrazine (ATZ) in soil were investigated. The adsorption kinetics and the adsorption isotherms of ATZ on soil, MFMPs, and MFMPs-aged fitted well by the pseudo-second-order model and the Langmuir model, respectively. ATZ were easier to desorb from soil, MFMPs, and MFMPs-aged in the simulated earthworm digestive fluid than that in the CaCl2 solution. The adsorption and desorption capacities of MFMPs and MFMPs-aged for ATZ were higher than those of soil, especially for MFMPs-aged. The existence of MPs in soil strengthened the adsorption and desorption capacities of ATZ, and the strengthened effects were promoted by the addition amount and aging process of MPs. Moreover, the occurrence of MPs significantly increased the bioaccumulation of ATZ in earthworms, especially for MFMPs-aged. This study deepens the knowledge of the interaction mechanisms of mulch film-derived MPs and pesticide pollution. Display omitted •The adsorption and desorption capacities of ATZ on MPs increased after aging.•The adsorption and desorption capacities of ATZ on MPs were higher than those on soil.•Simulated earthworm digestive fluid promoted the desorption of ATZ from MPs and soil.•The addition of MPs increased the adsorption and desorption capacities of ATZ in soil.•The presence of MPs in soil enhanced the bioaccumulation of ATZ in earthworms.
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