微塑性衍生溶解有机物的特征和分子特征

IF 3 4区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Miaorou Du, Jianfeng Tang, Xiaoyi Zhao, Xiaolei Yang, Chun-nu Geng
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引用次数: 0

摘要

微塑料浸出越来越被认为是一个重要的环境问题,但微塑料溶解有机物(MP-DOM)的特征仍然没有得到充分的了解。本研究系统地综合了51篇已发表的研究数据,定量评价了多种微塑料类型和环境条件下MP-DOM的释放特征及其控制因素。分析发现,多个环境变量共同调控MP-DOM的释放,较小的粒径、较高的温度和紫外线老化显著促进了溶解有机碳(DOC)的浸出,而溶液离子强度和pH也调节了释放行为,并与高DOC释放有关。可生物降解聚合物(如PLA、PBAT)和石油基聚合物通常具有相当的DOC释放能力。水体酸化导致水体ph显著降低,溶解有机质以亲水性组分和低芳香性组分为主,其中78.95%的SUVA254值低于3 L/(mg·m)。较长的老化时间和较大的微塑性积累有利于芳香和疏水组分的释放。荧光表征表明,微生物副产物样物质占主导地位,伴随腐殖质样和蛋白质样荧光团,表明聚合物降解和生物膜活性。对20篇文献(n = 431)的数据进行平行因子分析,发现溶出有机物中蛋白质样物质占57.54%,腐殖质样物质占42.46%。我们的数据分析为生态系统中微塑料的行为和命运提供了有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characteristics and Molecular Signatures of Microplastic-Derived Dissolved Organic Matter

Microplastic leaching is increasingly recognized as a significant environmental concern, yet the characteristics of microplastic-dissolved organic matter (MP-DOM) remain inadequately understood. This study systematically synthesized data from 51 published studies to quantitatively evaluate the characteristics and controlling factors of MP-DOM release across multiple microplastic types and environmental conditions. The analysis revealed that multiple environmental variables jointly regulate MP-DOM release: smaller particle size, higher temperatures, and UV-induced aging significantly promoted dissolved organic carbon (DOC) leaching, while solution ionic strength and pH also modulated release behavior, and high DOC release was associated. Biodegradable polymers (e.g., PLA, PBAT) and petroleum-based polymers generally exhibited comparable DOC release capacities. Furthermore, high DOC release was linked to aquatic acidification, resulting in significant reductions in pH. The dissolved organic matter was dominated by hydrophilic components and low-aromaticity fractions, with 78.95% of the SUVA254 values being below 3 L/(mg·m). And longer aging times and greater microplastic accumulation favored the release of aromatic and hydrophobic components. Fluorescence characterization demonstrated that microbial byproduct-like substances were predominant, accompanied by humic-like and protein-like fluorophores, indicating both polymer degradation and biofilm activity. A parallel factor analysis applied to data from 20 articles (n = 431) indicated that the dissolved organic matter was composed of 57.54% protein-like substances and 42.46% humic-like substances. Our data analysis offered valuable insights into the behavior and fate of microplastics in ecosystems.

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来源期刊
Water, Air, & Soil Pollution
Water, Air, & Soil Pollution 环境科学-环境科学
CiteScore
4.50
自引率
6.90%
发文量
448
审稿时长
2.6 months
期刊介绍: Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments. Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation. Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.
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