降雨引起的微塑料在荷兰非饱和土壤中的归宿和迁移。

IF 3.5 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology Pub Date : 2024-11-12 DOI:10.1016/j.jconhyd.2024.104456

Rozita Soltani Tehrani, Xiaomei Yang, Jos van Dam

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引用次数: 0

摘要

微塑料污染已成为陆地生态系统中日益严重的问题，对环境和人类健康产生了重大影响。了解微塑料在土壤环境中的归宿和迁移对于制定有效的缓解策略至关重要。本研究调查了在不同降雨强度和土壤类型下，微塑料（低密度聚乙烯（LDPE）、聚己二酸丁二醇酯（PBAT）和淀粉基生物降解塑料）在非饱和土壤中的迁移动态，旨在阐明影响其行为的因素。通过分析污水样本来测量微塑料迁移，微塑料平衡分析确保了实验的准确性。该装置复制了真实世界的流动条件，为了解微塑料在非饱和多孔介质中的迁移提供了依据。微塑料平衡分析显示了较高的回收率（介于 64 % 和 104 % 之间），表明了实验方法的可靠性。砂质壤土和壤土的微塑料迁移差异很大，壤土因其独特的性质而表现出更高的冲刷率。与 PBAT 和淀粉基颗粒相比，低密度聚乙烯微塑料更容易从土柱中脱离。与低降雨强度相比，壤质砂土土柱中较高的降雨强度导致低密度聚乙烯、PBAT 和淀粉基颗粒的冲刷率分别增加了 92%、144% 和 85%。在砂质壤土中，降雨强度增加导致低密度聚乙烯、PBAT 和淀粉基颗粒的冲刷率明显增加，分别为 93%、69% 和 45%。这突出表明了水流在土壤基质中移动微塑料的重要作用。

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Rainfall-induced microplastic fate and transport in unsaturated Dutch soils

Microplastic pollution has become a growing concern in terrestrial ecosystems, with significant implications for environmental and human health. Understanding the fate and transport of microplastics in soil environment is crucial for effective mitigation strategies. This study investigates the dynamics of microplastic (Low-density polyethylene (LDPE), polybutylene adipate terephthalate (PBAT), and starch-based biodegradable plastic) transport in unsaturated soils under varying rainfall intensities and soil types, aiming to elucidate the factors influencing their behavior. Effluent samples were analyzed to measure microplastic transport, with microplastic balance analysis ensuring experimental accuracy. The setup replicated real-world flow conditions, providing insights into microplastic transport in unsaturated porous media. Microplastic balance analysis revealed high recovery factors (between 64 % and 104 %), indicating the reliability of the experimental approach. Microplastic transport varied significantly between sandy loam and loamy sand soils, with loamy sand soils exhibiting higher wash-off rates due to their unique properties. LDPE microplastics showed a higher tendency to detach from soil columns compared to PBAT and starch-based particles. Higher rainfall intensity in loamy sand soil columns resulted in an increased washout of LDPE, PBAT, and starch-based particles by 92 %, 144 %, and 85 %, respectively, compared to low rainfall intensity. In sandy loam soil, increased rainfall intensity resulted in a significantly higher washout of LDPE, PBAT, and starch-based particles with percentages of 93 %, 69 %, and 45 %, respectively. This underscores the important role of water flow in mobilizing microplastics within the soil matrix.

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来源期刊

Journal of contaminant hydrology 环境科学-地球科学综合

CiteScore

6.80

自引率

2.80%

发文量

129

审稿时长

68 days

期刊介绍： The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.