Microplastic Transport and Accumulation in Rural Waterbodies: Insights from a Small Catchment in East China.

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Toxics Pub Date : 2024-10-19 DOI:10.3390/toxics12100761

Tom Lotz, Wenjun Chen, Shoubao Su

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Abstract

Microplastic (MP) pollution in agricultural ecosystems is an emerging environmental concern, with limited knowledge of its transport and accumulation in rural waterbodies. This study investigates the distribution and sources of MP in drainage ditches influenced by pond connectivity, land use, and soil properties within a small catchment in Nanjing, East China. Sediment was collected from ditches in 18 sites across forest, agricultural, horticultural, and urban areas. Using laser-directed infrared spectroscopy (LDIR), 922 MP particles were identified. Six materials were dominant: fluororubber (FR), polyethylene terephthalate (PET), polyurethane (PU), acrylonitrile (ACR), chlorinated polyethylene (CPE), and polyethylene (PE). MP concentrations varied by land use and pond connectivity, with ditches above ponds exhibiting higher counts (1700 particles/kg) than those below (1050 particles/kg), indicating that ponds act as MP sinks. The analysis revealed site-specific MP sources, with FR linked to road runoff and PET associated with agricultural practices. Correlations between MP shape and soil properties showed that more compact and filled shapes were more commonly associated with coarser soils. PE particle size was negatively correlated with organic matter. This study highlights the need for targeted strategies to reduce MP pollution in rural landscapes, such as reducing plastic use, ditch maintenance, and improved road runoff management.

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农村水体中的微塑料迁移和累积：华东小流域的启示》。

农业生态系统中的微塑料（MP）污染是一个新出现的环境问题，但人们对其在农村水体中的迁移和积累了解有限。本研究调查了华东地区南京市一个小流域内受池塘连通性、土地利用和土壤性质影响的排水沟中微塑料的分布和来源。研究人员从18个地点的沟渠中收集了沉积物，这些地点遍布森林、农业、园艺和城市地区。利用激光直接红外光谱（LDIR）技术，确定了 922 种 MP 颗粒。主要有六种材料：氟橡胶 (FR)、聚对苯二甲酸乙二酯 (PET)、聚氨酯 (PU)、丙烯腈 (ACR)、氯化聚乙烯 (CPE) 和聚乙烯 (PE)。MP 浓度因土地用途和池塘连通性而异，池塘上方沟渠的 MP 粒子数（1700 粒子/千克）高于池塘下方沟渠的 MP 粒子数（1050 粒子/千克），这表明池塘是 MP 的汇集地。分析揭示了特定地点的 MP 来源，FR 与道路径流有关，PET 与农业耕作有关。MP 形状与土壤特性之间的相关性表明，更紧凑、更饱满的形状通常与更粗糙的土壤有关。聚乙烯颗粒大小与有机质呈负相关。这项研究强调，需要采取有针对性的策略来减少农村景观中的 MP 污染，如减少塑料的使用、沟渠维护和改善道路径流管理。

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

Toxics Chemical Engineering-Chemical Health and Safety

CiteScore

4.50

自引率

10.90%

发文量

681

审稿时长

6 weeks

期刊介绍： The Journal accepts papers describing work that furthers our understanding of the exposure, effects, and risks of chemicals and materials in humans and the natural environment as well as approaches to assess and/or manage the toxicological and ecotoxicological risks of chemicals and materials. The journal covers a wide range of toxic substances, including metals, pesticides, pharmaceuticals, biocides, nanomaterials, and polymers such as micro- and mesoplastics. Toxics accepts papers covering: The occurrence, transport, and fate of chemicals and materials in different systems (e.g., food, air, water, soil); Exposure of humans and the environment to toxic chemicals and materials as well as modelling and experimental approaches for characterizing the exposure in, e.g., water, air, soil, food, and consumer products; Uptake, metabolism, and effects of chemicals and materials in a wide range of systems including in-vitro toxicological assays, aquatic and terrestrial organisms and ecosystems, model mammalian systems, and humans; Approaches to assess the risks of chemicals and materials to humans and the environment; Methodologies to eliminate or reduce the exposure of humans and the environment to toxic chemicals and materials.