Transport Mechanisms of Nanoplastics in Agricultural Soils Under Snowmelt Infiltration Conditions in Cold Regions

IF 5 1区地球科学 Q2 ENVIRONMENTAL SCIENCES

Water Resources Research Pub Date : 2025-10-08 DOI:10.1029/2024wr038827

Renjie Hou, Yunjia Hong, Yanling Deng, Bingyu Zhu, Yuxuan Wang, Haihong Zhao, Jian Zhang, Liuwei Wang, Yulu Zhou, Wei Huang

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Abstract

This study was conducted to uncover the migration characteristics of nanoplastics (NPs) permeating with snowmelt water in freeze‐thaw soil and their regulatory mechanisms. Luvisol (LCK), chernozem (CCK), and albic soil (ACK) were selected as porous media, and two scenarios of tetracycline and tetracycline plus biochar were established (LTL and LTLB for luvisol, CTL and CTLB for chernozem, and ATL and ATLB for albic). With snowmelt infiltration, soil NPs concentration in the CCK treatment had a peak value of 25.62 mg kg−1 in the vertical profile, whereas the ACK and LCK treatments were 5.32% and 7.79% higher than the CCK treatment, respectively. The presence of tetracycline and biochar provided additional adsorption sites for NPs, which in turn promoted the deposition and sequestration effects of NPs. This research constructed an innovative migration model of soil NPs under snowmelt infiltration and confirmed that soil NPs would be strongly resolved and re‐migrate under extreme snowfall. Moreover, the NPs in the chernozem would reach 2.12 mg kg−1 at the vertical profile crest after 20 years, which is 6.19% and 19.88% lower relative to the albic soil and luvisol, respectively. Finally, the Extended Derjaguin‐Landau‐Verwey‐Overbeek (XDLVO) theory measurements demonstrated that the energy barrier heights of the ATL and ATLB treatments in albic soil were 16.80% and 36.91% lower than the ACK treatment, respectively. The lower height of the energy potential barrier makes NPs more accessible to soil particles, which reconfirms that the presence of biochar coupled with tetracycline mediation can effectively inhibit the dissociation release characteristics of soil NPs.

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寒区融雪入渗条件下纳米塑料在农业土壤中的运移机制

本研究旨在揭示纳米塑料（NPs）随融雪水在冻融土壤中的迁移特征及其调控机制。选择陆visol （LCK）、黑钙土（CCK）和白质土（ACK）作为多孔介质，建立了四环素和四环素加生物炭两种方案（陆visol为LTL和LTLB，黑钙土为CTL和CTLB，白质为ATL和ATLB）。在融雪入渗条件下，CCK处理土壤NPs浓度在垂直剖面上的峰值为25.62 mg kg - 1，而ACK和LCK处理分别比CCK处理高5.32%和7.79%。四环素和生物炭的存在为NPs提供了额外的吸附位点，从而促进了NPs的沉积和固存作用。本研究构建了融雪入渗条件下土壤NPs的迁移模型，证实了极端降雪条件下土壤NPs会发生强烈的溶解和再迁移。黑钙土20年后垂直剖面峰值NPs为2.12 mg kg - 1，比白垩土和陆visol分别低6.19%和19.88%。最后，扩展Derjaguin - Landau - Verwey - Overbeek （XDLVO）理论测量结果表明，ATL和ATLB处理在白土中的能势阱高度分别比ACK处理低16.80%和36.91%。较低的能量势垒高度使得NPs更容易接近土壤颗粒，这再次证实了生物炭与四环素介导的存在可以有效抑制土壤NPs的解离释放特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water Resources Research 环境科学-湖沼学

CiteScore

8.80

自引率

13.00%

发文量

599

审稿时长

3.5 months

期刊介绍： Water Resources Research (WRR) is an interdisciplinary journal that focuses on hydrology and water resources. It publishes original research in the natural and social sciences of water. It emphasizes the role of water in the Earth system, including physical, chemical, biological, and ecological processes in water resources research and management, including social, policy, and public health implications. It encompasses observational, experimental, theoretical, analytical, numerical, and data-driven approaches that advance the science of water and its management. Submissions are evaluated for their novelty, accuracy, significance, and broader implications of the findings.