Environmental Pollution最新文献_第4页

Interaction and sorption mechanisms of phthalate plasticizers and Cd2+ on biochar 邻苯二甲酸酯类增塑剂和 Cd2+ 在生物炭上的相互作用和吸附机制

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution

Pub Date : 2025-04-02 DOI: 10.1016/j.envpol.2025.126176

Wenjie Li , Jian Wang , Xuwen Chen , Ahmed Mosa , Wanting Ling , Yanzheng Gao

Biochar exhibits significant potential for the remediation of soil contaminated with organic pollutants and heavy metals. A comprehensive understanding of the interfacial interactions and sorption mechanisms of low-hydrophobicity phthalate plasticizers, such as dimethyl phthalate (DMP) and diethyl phthalate (DEP), along with Cd²⁺ on biochar, is essential for the effective remediation of polluted soil environments. This study systematically examines the interaction and sorption mechanisms of PAEs-Cd²⁺ on biochar at both macro and micro levels using sorption batch experiments and molecular dynamics simulations. The sorption of contaminants by biochar occurred through a combination of physical and chemical mechanisms. The presence of coexisting pollutants reduced the sorption capacity of biochar to PAEs but had a minimal effect on Cd²⁺ adsorption. In the co-sorption system, PAEs and Cd²⁺ demonstrated distinct interaction behaviors. Due to its smaller molecular size and higher diffusion coefficient, Cd²⁺ readily bonded to surface sorption sites on biochar and infiltrated its pores. Although PAE-ion complexes enhanced the sorption of pollutants by biochar, PAE molecules, and cluster structures primarily accumulated on the biochar surface, interacting with heavy metals through electrostatic forces. This interaction reduced the contribution of pore filling to pollutant sorption and weakened the desorption hysteresis capacity of biochar. The intraparticle diffusion model had similar results. Thus, a larger specific surface area and an abundant pore structure are crucial factors in improving the co-sorption capacity of biochar. This study offers novel insights into the sorption behavior of PAEs and Cd²⁺ on biochar within organic-inorganic composite pollution.

生物炭在修复受有机污染物和重金属污染的土壤方面具有巨大潜力。全面了解低疏水性邻苯二甲酸酯类增塑剂（如邻苯二甲酸二甲酯（DMP）和邻苯二甲酸二乙酯（DEP））与 Cd2+ 在生物炭上的界面相互作用和吸附机制对于有效修复受污染的土壤环境至关重要。本研究利用吸附批量实验和分子动力学模拟，从宏观和微观两个层面系统研究了 PAEs-Cd2+ 在生物炭上的相互作用和吸附机理。生物炭对污染物的吸附是通过物理和化学机制共同作用实现的。共存污染物的存在降低了生物炭对 PAEs 的吸附能力，但对 Cd2+ 的吸附影响很小。在共吸附体系中，PAEs 和 Cd2+ 表现出不同的相互作用行为。由于 Cd2+ 的分子尺寸较小，扩散系数较高，因此很容易与生物炭表面的吸附位点结合，并渗入其孔隙中。虽然 PAE 离子复合物增强了生物炭对污染物的吸附，但 PAE 分子和团簇结构主要聚集在生物炭表面，通过静电力与重金属相互作用。这种相互作用降低了孔隙填充对污染物吸附的贡献，削弱了生物炭的解吸滞后能力。颗粒内扩散模型也得出了类似的结果。因此，较大的比表面积和丰富的孔隙结构是提高生物炭协同吸附能力的关键因素。本研究为有机-无机复合污染中 PAEs 和 Cd2+ 在生物炭上的吸附行为提供了新的见解。

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引用次数: 0

Atmospheric microplastics deposition in a central Indian city: Distribution, characteristics and seasonal variations

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution

Pub Date : 2025-04-02 DOI: 10.1016/j.envpol.2025.126183

Archana Prajapati , Pradip Jadhao , Asirvatham Ramesh Kumar

Atmospheric microplastics (AMPs) transport and deposition in urban areas contribute to microplastics pollution. The present study investigates AMPs deposition, characteristics, potential sources, and the influence of meteorological factors in a central Indian city. AMPs were collected over three land-use types, viz. institutional, commercial, and industrial areas, during four seasons: summer, monsoon, autumn, and winter. The deposition flux of microplastics ranged from 212.53 ± 52.32 to 543.25 ± 71.23 particles/m²/day. The AMPs were predominantly fibres (87.84 %), followed by films (5.43 %), with particle size <1000 μm contributed 43.67 %. The predominant polymer types identified were polyethylene terephthalate (PET, 37.39 %), nylon (20.49 %), and polypropylene (PP, 10.27 %). Higher deposition fluxes were recorded in summer, with 491.06 ± 73.37 particles/m²/day. Correlation analysis revealed a negative correlation between rainfall and AMPs deposition, suggesting a potential cleaning role of rainfall. The estimated annual deposition flux of AMPs in Nagpur city was 3.22 × 10¹³ particles. Higher AMPs deposition was attributed to plastic waste littering, industrial emissions, and textiles. The estimated mean annual inhalation exposures of AMPs of size 50–250 μm for children and adults were 7375.84 ± 1312.89 and 3738.17 ± 665.39 MPs/kg-bw/year, respectively. The findings of this study contribute to understanding the fate of AMPs and its implications for human exposure. The findings underscore the importance of reducing and managing plastic waste.

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引用次数: 0

In vitro effects of aged low-density polyethylene micro(nano)plastic particles on human airway epithelial cells

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution

Pub Date : 2025-04-02 DOI: 10.1016/j.envpol.2025.126186

Agnė Vailionytė , Ieva Uogintė , Justina Pajarskienė , Edvardas Bagdonas , Tadas Jelinskas , Ilja Ignatjev , Steigvilė Byčenkienė , Rūta Aldonytė

Airborne micro(nano)plastic (MNP) pollution has emerged as a major global concern due to its increasingly worrying adverse health effects. Environmental weathering and UV irradiation of plastic waste, together with tire wear, generate airborne MNPs with irregular shapes and varied sizes, with low-density polyethylene (LDPE) being the predominant plastic type. However, knowledge of MNPs’ toxicological effects remains scarce, as current in vitro research mainly focuses on commercial polystyrene beads. In this study, we investigated for the first time the toxicological effects of environmentally relevant aged LDPE MNPs on human bronchial epithelial cells (BEAS-2B). UV-aged LDPE fragments of irregular sizes and shapes were used to mimic real atmospheric particles, and BEAS-2B cells were exposed to 10–1000 μg/cm² of LDPE MNPs. Our results showed that MNPs were internalized by BEAS-2B cells and promoted epithelial-to-mesenchymal transition (EMT), characterized by reduced β-catenin and increased vimentin expression, enhanced motility, and disturbed cell cycle. Moreover, exposure to aged LDPE MNPs significantly increased intracellular ROS levels and reduced cell proliferation rate at the highest dose. LDPE MNPs triggered oxidative stress in BEAS-2B cells through activation of the NRF2 signaling pathway, with impaired autophagic flux indicated by increased expression of p62 and LC3A/B. Importantly, LDPE MNP exposure significantly increased the secretion of pro-inflammatory mediators (CD62E, CD62P, ICAM-1, IL-6, IL-8), accompanied by suppressive effects on mitochondrial respiration and glycolytic function at 1000 μg/cm². Taken together, our findings suggest that inhalation of LDPE MNPs could impact the morphology and function of the human airway epithelium and respiratory health in general.

{"title":"In vitro effects of aged low-density polyethylene micro(nano)plastic particles on human airway epithelial cells","authors":"Agnė Vailionytė , Ieva Uogintė , Justina Pajarskienė , Edvardas Bagdonas , Tadas Jelinskas , Ilja Ignatjev , Steigvilė Byčenkienė , Rūta Aldonytė","doi":"10.1016/j.envpol.2025.126186","DOIUrl":"10.1016/j.envpol.2025.126186","url":null,"abstract":"<div><div>Airborne micro(nano)plastic (MNP) pollution has emerged as a major global concern due to its increasingly worrying adverse health effects. Environmental weathering and UV irradiation of plastic waste, together with tire wear, generate airborne MNPs with irregular shapes and varied sizes, with low-density polyethylene (LDPE) being the predominant plastic type. However, knowledge of MNPs’ toxicological effects remains scarce, as current <em>in vitro</em> research mainly focuses on commercial polystyrene beads. In this study, we investigated for the first time the toxicological effects of environmentally relevant aged LDPE MNPs on human bronchial epithelial cells (BEAS-2B). UV-aged LDPE fragments of irregular sizes and shapes were used to mimic real atmospheric particles, and BEAS-2B cells were exposed to 10–1000 μg/cm<sup>2</sup> of LDPE MNPs. Our results showed that MNPs were internalized by BEAS-2B cells and promoted epithelial-to-mesenchymal transition (EMT), characterized by reduced β-catenin and increased vimentin expression, enhanced motility, and disturbed cell cycle. Moreover, exposure to aged LDPE MNPs significantly increased intracellular ROS levels and reduced cell proliferation rate at the highest dose. LDPE MNPs triggered oxidative stress in BEAS-2B cells through activation of the NRF2 signaling pathway, with impaired autophagic flux indicated by increased expression of p62 and LC3A/B. Importantly, LDPE MNP exposure significantly increased the secretion of pro-inflammatory mediators (CD62E, CD62P, ICAM-1, IL-6, IL-8), accompanied by suppressive effects on mitochondrial respiration and glycolytic function at 1000 μg/cm<sup>2</sup>. Taken together, our findings suggest that inhalation of LDPE MNPs could impact the morphology and function of the human airway epithelium and respiratory health in general.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"374 ","pages":"Article 126186"},"PeriodicalIF":7.6,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatiotemporal evolution and risk thresholds of PM2.5 components in China from the human health perspective 从人类健康角度看中国 PM2.5 成分的时空演变和风险阈值

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution

Pub Date : 2025-04-02 DOI: 10.1016/j.envpol.2025.126194

Haifeng Xu , Wenhui Luo , Chen Dai , Shijie Zhao , Rui Qian , Bing Dong , Zhengqiang Li , Jinji Ma

PM_2.5 is a significant global public health hazard, with its components closely linked to various fatal diseases, thereby significantly increasing mortality rates. This study analysed the spatiotemporal evolution of PM_2.5-related mortality and death rates in China using risk attribution methods based on PM_2.5-component and population data. The study used a LightGBM model based on Bayesian and SHAP algorithms to identify the concentration thresholds at which the components of PM_2.5 affect mortality. The results showed that from 2001 to 2022, the mortality rates influenced by the five PM_2.5 components showed a consistent downward trend, decreasing by 101,000–529,000, with a mean annual decrease of 2.2–4.6%. The relative importance of organic matter (OM), nitrate (NO₃^-) and ammonium (NH₄⁺) in influencing mortality increased by 6.3, 17.4 and 4% respectively, while the relative importance of black carbon (BC) and sulphate (SO₄^2-) in influencing mortality decreased rapidly to approximately 2%. The contribution of OM and SO₄^2- to mortality exceeded 30%, with thresholds of 8.6–10.3 and 9.6–10.5 μg/m³, respectively. The thresholds for the effects of NO₃^-, NH₄⁺, and BC on mortality were 6.8–9.4, 3.4–6, and 1.8–3.5 μg/m³, respectively. This study provides effective insights for policymakers to help formulate targeted air pollution control measures and optimise public health interventions to support human health and sustainable societal development.

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引用次数: 0

Microplastics from cigarette filters: comparative effects on selected terrestrial and aquatic invertebrates 香烟过滤嘴中的微塑料：对某些陆生和水生无脊椎动物的比较影响

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution

Pub Date : 2025-04-02 DOI: 10.1016/j.envpol.2025.126199

Andraž Dolar , Branka Mušič , Tina Skalar , Gregor Marolt , Damjana Drobne , Andrijana Sever Škapin , Anita Jemec Kokalj

Cigarette filters comprise plasticised cellulose acetate, a synthetic polymer categorized as bioplastic. They represent a significant source of microplastics (MPs), in particular microfibers, and associated chemicals, yet their impact on organisms, especially soil invertebrates, is not well-studied. This research examines the effects of MPs milled from smoked (SCF-MPs) and unsmoked cigarette filters (UCF-MPs) on terrestrial invertebrates (Porcellio scaber, Tenebrio molitor) and aquatic invertebrates (Daphnia magna, Brachionus calyciflorus). SCF-MPs and UCF-MPs were found to be 9.06 ± 4.1 μm and 12.71 ± 6.82 μm in size, respectively. Both samples contained triacetin and potentially toxic metals, while SCF-MPs also contained nicotine and a larger number of trace organic compounds. While exposure to SCF-MPs or UCF-MPs (up to 1.5% MPs, w/w in soil) did not affect the survival of either terrestrial invertebrate, several physiological responses were observed. These included changes in immune parameters, energy-related biomarker levels, and altered glutathione S-transferase and acetylcholinesterase activities. Both types of MPs were acutely toxic to aquatic invertebrates, reducing the survival rates of B. calyciflorus (10 mg L^-1 of either particle after 48h exposure) and D. magna (100 mg L^-1 of SCF-MPs after 48h exposure). SCF-MPs generally caused more pronounced effects than UCF-MPs. This study highlights the need for effective environmental management to address both smoked and unsmoked cigarette filters.

{"title":"Microplastics from cigarette filters: comparative effects on selected terrestrial and aquatic invertebrates","authors":"Andraž Dolar , Branka Mušič , Tina Skalar , Gregor Marolt , Damjana Drobne , Andrijana Sever Škapin , Anita Jemec Kokalj","doi":"10.1016/j.envpol.2025.126199","DOIUrl":"10.1016/j.envpol.2025.126199","url":null,"abstract":"<div><div>Cigarette filters comprise plasticised cellulose acetate, a synthetic polymer categorized as bioplastic. They represent a significant source of microplastics (MPs), in particular microfibers, and associated chemicals, yet their impact on organisms, especially soil invertebrates, is not well-studied. This research examines the effects of MPs milled from smoked (SCF-MPs) and unsmoked cigarette filters (UCF-MPs) on terrestrial invertebrates (<em>Porcellio scaber, Tenebrio molitor</em>) and aquatic invertebrates (<em>Daphnia magna, Brachionus calyciflorus</em>). SCF-MPs and UCF-MPs were found to be 9.06 ± 4.1 μm and 12.71 ± 6.82 μm in size, respectively. Both samples contained triacetin and potentially toxic metals, while SCF-MPs also contained nicotine and a larger number of trace organic compounds. While exposure to SCF-MPs or UCF-MPs (up to 1.5% MPs, w/w in soil) did not affect the survival of either terrestrial invertebrate, several physiological responses were observed. These included changes in immune parameters, energy-related biomarker levels, and altered glutathione S-transferase and acetylcholinesterase activities. Both types of MPs were acutely toxic to aquatic invertebrates, reducing the survival rates of <em>B. calyciflorus</em> (10 mg L<sup>-1</sup> of either particle after 48h exposure) and <em>D. magna</em> (100 mg L<sup>-1</sup> of SCF-MPs after 48h exposure). SCF-MPs generally caused more pronounced effects than UCF-MPs. This study highlights the need for effective environmental management to address both smoked and unsmoked cigarette filters.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"374 ","pages":"Article 126199"},"PeriodicalIF":7.6,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

From input to transformation: Investigating the dynamic evolution of volatile organic compounds and driving mechanisms during sandstorms

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution

Pub Date : 2025-04-02 DOI: 10.1016/j.envpol.2025.126192

Linzhen Wang , Guangyao Shi , Huihui Du , Jinsong Zhang , Liangjin Yao , Lingtong Du , Xilu Ni , Yang Hu , Danbo Pang

Sandstorms are frequent natural phenomena in arid and semi-arid regions, with significant impacts on air quality and ecological systems. Volatile organic compounds (VOCs) demonstrate high photochemical reactivity and a strong tendency to form secondary pollutants during sandstorm events. However, the mechanisms governing their interactions with dust particles remain poorly understood. This study was conducted using synchronous observations at the Yinchuan Urban Ecosystem Positioning Station in Ningxia, where data on meteorological parameters, atmospheric pollutants, and VOCs were collected across different dust storm stages. By integrating Positive Matrix Factorization and Structural Equation Model, we systematically examined the dynamic evolution of VOCs, pollution sources, and their driving mechanisms during dust storm events. Results showed that during sandstorm period, the total VOCs concentration declined from 36.14 × 10⁻⁹ (pre-sandstorm period) to 20.76 × 10⁻⁹, then gradually increased to 23.58 × 10⁻⁹ (post-sandstorm period). The primary contributors to VOCs included alkanes and oxygenated VOCs. Sandstorm inputs altered the VOCs component ratios, with the most pronounced reduction observed in low-reactivity alkanes. In the pre-sandstorm period, VOCs primarily originated from industrial activities and motor vehicle emissions, contributing 28 % and 23 %, respectively. During the sandstorm and post-sandstorm period, solvent sources and motor vehicle emissions emerged as the primary sources of VOCs. Meteorological factors, such as wind speed, primarily exerted a dilution effect on VOCs, whereas temperature and humidity promoted VOCs generation in the post-sandstorm period. During the sandstorm period, dust particles mainly diluted VOCs concentrations, whereas in the post-sandstorm period, they contributed to increased VOCs levels by facilitating secondary pollutant formation. This study enhances the theoretical understanding of compound pollution formation during sandstorm events and provides scientific guidance for regional pollution control strategies.

{"title":"From input to transformation: Investigating the dynamic evolution of volatile organic compounds and driving mechanisms during sandstorms","authors":"Linzhen Wang , Guangyao Shi , Huihui Du , Jinsong Zhang , Liangjin Yao , Lingtong Du , Xilu Ni , Yang Hu , Danbo Pang","doi":"10.1016/j.envpol.2025.126192","DOIUrl":"10.1016/j.envpol.2025.126192","url":null,"abstract":"<div><div>Sandstorms are frequent natural phenomena in arid and semi-arid regions, with significant impacts on air quality and ecological systems. Volatile organic compounds (VOCs) demonstrate high photochemical reactivity and a strong tendency to form secondary pollutants during sandstorm events. However, the mechanisms governing their interactions with dust particles remain poorly understood. This study was conducted using synchronous observations at the Yinchuan Urban Ecosystem Positioning Station in Ningxia, where data on meteorological parameters, atmospheric pollutants, and VOCs were collected across different dust storm stages. By integrating Positive Matrix Factorization and Structural Equation Model, we systematically examined the dynamic evolution of VOCs, pollution sources, and their driving mechanisms during dust storm events. Results showed that during sandstorm period, the total VOCs concentration declined from 36.14 × 10<sup>−9</sup> (pre-sandstorm period) to 20.76 × 10<sup>−9</sup>, then gradually increased to 23.58 × 10<sup>−9</sup> (post-sandstorm period). The primary contributors to VOCs included alkanes and oxygenated VOCs. Sandstorm inputs altered the VOCs component ratios, with the most pronounced reduction observed in low-reactivity alkanes. In the pre-sandstorm period, VOCs primarily originated from industrial activities and motor vehicle emissions, contributing 28 % and 23 %, respectively. During the sandstorm and post-sandstorm period, solvent sources and motor vehicle emissions emerged as the primary sources of VOCs. Meteorological factors, such as wind speed, primarily exerted a dilution effect on VOCs, whereas temperature and humidity promoted VOCs generation in the post-sandstorm period. During the sandstorm period, dust particles mainly diluted VOCs concentrations, whereas in the post-sandstorm period, they contributed to increased VOCs levels by facilitating secondary pollutant formation. This study enhances the theoretical understanding of compound pollution formation during sandstorm events and provides scientific guidance for regional pollution control strategies.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"374 ","pages":"Article 126192"},"PeriodicalIF":7.6,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatiotemporal variations of dissolved nitrous oxide concentrations in small water bodies in a typical urban landscape in eastern China

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution

Pub Date : 2025-04-01 DOI: 10.1016/j.envpol.2025.126173

Xuebing Chen , Yuye Shen , Yihong Liu , Fangfang Zhang , Linlin Tian , Jing Wang , Yanjiang Cai , Yan Li , Scott X. Chang

Waters in urban landscape are susceptible to nitrogen (N) pollution, potentially leading to supersaturation of dissolved nitrous oxide (N₂O) and making them a source of atmospheric N₂O. However, the spatiotemporal variations and driving factors of dissolved N₂O concentrations in these waters remain unclear. This study examined the spatiotemporal variations of dissolved N₂O in an interconnected river-lake system in a subtropical urban landscape. The annual mean dissolved N₂O concentration was 0.81 μg N L⁻¹, with a mean N₂O saturation of 304 %, indicating the system could act as a N₂O emitter. Under the influence of daily fluctuations in water temperature and DO, the diurnal variation of N₂O was most pronounced in autumn, with the smallest amplitude observed in winter. Seasonal mean concentrations of dissolved N₂O, N, phosphorus (P), chlorophyll-a (Chl-a) and dissolved oxygen (DO) peaked in winter and were lowest in summer. The central lake had significantly lower dissolved N₂O, N and P concentrations, but possessed higher water temperature, pH, concentrations of Chl-a and DO than its upstream and downstream rivers. Dissolved N₂O concentrations were positively correlated with concentrations of N and P, but negatively with pH, Chl-a, and DO. There was intensifying competition for N between the N₂O producers and algae, particularly in summer or in the central lake area. Therefore, the spatiotemporal variations of dissolved N₂O concentrations were primarily driven by the integrated effects of seasonal conditions, nutrient fluctuations and algal growth. This research can provide essential scientific guidance for developing the effective strategies to control N pollution and mitigate the risk of N₂O emissions from water bodies in urban landscape.

{"title":"Spatiotemporal variations of dissolved nitrous oxide concentrations in small water bodies in a typical urban landscape in eastern China","authors":"Xuebing Chen , Yuye Shen , Yihong Liu , Fangfang Zhang , Linlin Tian , Jing Wang , Yanjiang Cai , Yan Li , Scott X. Chang","doi":"10.1016/j.envpol.2025.126173","DOIUrl":"10.1016/j.envpol.2025.126173","url":null,"abstract":"<div><div>Waters in urban landscape are susceptible to nitrogen (N) pollution, potentially leading to supersaturation of dissolved nitrous oxide (N<sub>2</sub>O) and making them a source of atmospheric N<sub>2</sub>O. However, the spatiotemporal variations and driving factors of dissolved N<sub>2</sub>O concentrations in these waters remain unclear. This study examined the spatiotemporal variations of dissolved N<sub>2</sub>O in an interconnected river-lake system in a subtropical urban landscape. The annual mean dissolved N<sub>2</sub>O concentration was 0.81 μg N L<sup>−1</sup>, with a mean N<sub>2</sub>O saturation of 304 %, indicating the system could act as a N<sub>2</sub>O emitter. Under the influence of daily fluctuations in water temperature and DO, the diurnal variation of N<sub>2</sub>O was most pronounced in autumn, with the smallest amplitude observed in winter. Seasonal mean concentrations of dissolved N<sub>2</sub>O, N, phosphorus (P), chlorophyll-a (Chl-a) and dissolved oxygen (DO) peaked in winter and were lowest in summer. The central lake had significantly lower dissolved N<sub>2</sub>O, N and P concentrations, but possessed higher water temperature, pH, concentrations of Chl-a and DO than its upstream and downstream rivers. Dissolved N<sub>2</sub>O concentrations were positively correlated with concentrations of N and P, but negatively with pH, Chl-a, and DO. There was intensifying competition for N between the N<sub>2</sub>O producers and algae, particularly in summer or in the central lake area. Therefore, the spatiotemporal variations of dissolved N<sub>2</sub>O concentrations were primarily driven by the integrated effects of seasonal conditions, nutrient fluctuations and algal growth. This research can provide essential scientific guidance for developing the effective strategies to control N pollution and mitigate the risk of N<sub>2</sub>O emissions from water bodies in urban landscape.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"373 ","pages":"Article 126173"},"PeriodicalIF":7.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of polystyrene microplastics on growth, physiological traits of Microcystis aeruginosa and microcystin production and release

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution

Pub Date : 2025-04-01 DOI: 10.1016/j.envpol.2025.126178

Xiaotao Zhou , Sifan Zhou , Xinyi Duan , Nan Zhang , Yujing Ren , Le Liang , Xiaoxin Ye

With the increasing pollution from microplastics (MPs) in freshwater ecosystems, the effects of MPs on microalgae warrant further investigation. In our research, we examined how polystyrene microplastics (PS-MPs) with various particle sizes and concentrations affect the growth and physiology of Microcystis aeruginosa at different initial algal densities. The results showed that PS-MPs inhibited M. aeruginosa growth at low initial algal densities, with the highest inhibition rate (62.59%) observed at 0.1 μm, 1 mg/L PS-MPs. Effects on photosynthesis were correlated with changes in initial algal density, and PS-MPs caused notable disturbances to the antioxidant defense system of M. aeruginosa. Compared to medium-sized PS-MPs (1 μm), PS-MPs with smaller (0.1 μm) or larger particle sizes (5 μm) caused greater growth inhibition and more pronounced changes in photosynthesis and oxidative damage. At low initial algal densities, PS-MPs addition led to a substantial rise in the intracellular levels of microcystin-LR (MC-LR), with a 150% increase over the control at 0.1 μm, 1 mg/L PS-MPs. However, at high initial algal densities, apoptosis rates rose, leading to greater MC-LR release. This research offers a foundation for assessing the impact of PS-MPs on algal growth, as well as the production and release of MC-LR, contributing to the evaluation of MPs’ risks to aquatic ecosystems.

{"title":"Effects of polystyrene microplastics on growth, physiological traits of Microcystis aeruginosa and microcystin production and release","authors":"Xiaotao Zhou , Sifan Zhou , Xinyi Duan , Nan Zhang , Yujing Ren , Le Liang , Xiaoxin Ye","doi":"10.1016/j.envpol.2025.126178","DOIUrl":"10.1016/j.envpol.2025.126178","url":null,"abstract":"<div><div>With the increasing pollution from microplastics (MPs) in freshwater ecosystems, the effects of MPs on microalgae warrant further investigation. In our research, we examined how polystyrene microplastics (PS-MPs) with various particle sizes and concentrations affect the growth and physiology of <em>Microcystis aeruginosa</em> at different initial algal densities. The results showed that PS-MPs inhibited <em>M. aeruginosa</em> growth at low initial algal densities, with the highest inhibition rate (62.59%) observed at 0.1 μm, 1 mg/L PS-MPs. Effects on photosynthesis were correlated with changes in initial algal density, and PS-MPs caused notable disturbances to the antioxidant defense system of <em>M. aeruginosa</em>. Compared to medium-sized PS-MPs (1 μm), PS-MPs with smaller (0.1 μm) or larger particle sizes (5 μm) caused greater growth inhibition and more pronounced changes in photosynthesis and oxidative damage. At low initial algal densities, PS-MPs addition led to a substantial rise in the intracellular levels of microcystin-LR (MC-LR), with a 150% increase over the control at 0.1 μm, 1 mg/L PS-MPs. However, at high initial algal densities, apoptosis rates rose, leading to greater MC-LR release. This research offers a foundation for assessing the impact of PS-MPs on algal growth, as well as the production and release of MC-LR, contributing to the evaluation of MPs’ risks to aquatic ecosystems.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"373 ","pages":"Article 126178"},"PeriodicalIF":7.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fate of antibiotic resistance genes under different wastewater treatments and environmental conditions in an Algerian watershed

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution

Pub Date : 2025-04-01 DOI: 10.1016/j.envpol.2025.126179

Dalal Boulainine , Aziz Benhamrouche , Elisenda Ballesté , Samia Mezaache-Aichour , Cristina García-Aljaro

In recent decades, antibiotic resistance has become a major health threat. This study evaluates the efficiency of two wastewater treatment plants (WWTP), conventional activated sludge and advanced filtration-based Enviro-Septic, for removing antibiotic resistance genes (ARGs) and their prevalence in an Algerian watershed. Thirty-five wastewater and 122 river samples were collected. Sampling covered a 50 km transect, from a low-pollution site to a water reservoir, at six sites. The study analyzed different fecal indicators (E. coli (EC), spores of sulfite-reducing clostridia (SRC), somatic coliphages (SOMCPH)), CrAssphage (CrAssPH)), and three ARGs (bla_TEM, tetW, and sul1). Mean concentrations in raw sewage from the conventional and Enviro-Septic WWTPs were ∼7.1 and 6.4 log₁₀ (CFU/100 ml) for EC, 6.2 log₁₀ (PFU or CFU)/100 ml for SOMCPH and SRC in both treatments, and ∼7.5 and 5.2 for CrAssPH, respectively. The conventional WWTP achieved reductions of ∼4 log₁₀ for EC and SOMCPH, 3.5 log₁₀ for CrAssPH, and 1 log₁₀ for SRC. The Enviro-Septic system showed similar efficacy for EC and SRC but lower for SOMCPH (2.8 log₁₀) and CrAssPH (2.5 log₁₀). The mean concentrations (log₁₀ GC/100 ml) of ARGs in raw sewage of the conventional and the Enviro-Septic WWTP were 8.6 and 7.3 for tetW, 9.4 and 8.1 for sul1, 8.4 and 6.3 for bla_TEM, respectively. Both treatments achieved reductions of 2.9–3 log₁₀ for all ARGs. All river samples tested positive for the three ARGs, with lower concentrations at less fecally polluted sites, showing a reduction of up to 4 log₁₀. Strong correlations (p < 0.05) were observed between culturable indicators, CrAssPH, and ARGs (ρ 0.58–0.96), indicating a strong association between ARGs and human fecal contamination, although other environmental sources cannot be ruled out. This study provides insights into ARG dynamics and supports strategies to mitigate their spread, and protect public health.

{"title":"Fate of antibiotic resistance genes under different wastewater treatments and environmental conditions in an Algerian watershed","authors":"Dalal Boulainine , Aziz Benhamrouche , Elisenda Ballesté , Samia Mezaache-Aichour , Cristina García-Aljaro","doi":"10.1016/j.envpol.2025.126179","DOIUrl":"10.1016/j.envpol.2025.126179","url":null,"abstract":"<div><div>In recent decades, antibiotic resistance has become a major health threat. This study evaluates the efficiency of two wastewater treatment plants (WWTP), conventional activated sludge and advanced filtration-based Enviro-Septic, for removing antibiotic resistance genes (ARGs) and their prevalence in an Algerian watershed. Thirty-five wastewater and 122 river samples were collected. Sampling covered a 50 km transect, from a low-pollution site to a water reservoir, at six sites. The study analyzed different fecal indicators <em>(E. coli</em> (EC), spores of sulfite-reducing clostridia (SRC), somatic coliphages (SOMCPH)), CrAssphage (CrAssPH)), and three ARGs (<em>bla</em><sub>TEM</sub>, <em>tet</em>W, and <em>sul1</em>). Mean concentrations in raw sewage from the conventional and Enviro-Septic WWTPs were ∼7.1 and 6.4 log<sub>10</sub> (CFU/100 ml) for EC, 6.2 log<sub>10</sub> (PFU or CFU)/100 ml for SOMCPH and SRC in both treatments, and ∼7.5 and 5.2 for CrAssPH, respectively. The conventional WWTP achieved reductions of ∼4 log<sub>10</sub> for EC and SOMCPH, 3.5 log<sub>10</sub> for CrAssPH, and 1 log<sub>10</sub> for SRC. The Enviro-Septic system showed similar efficacy for EC and SRC but lower for SOMCPH (2.8 log<sub>10</sub>) and CrAssPH (2.5 log<sub>10</sub>). The mean concentrations (log<sub>10</sub> GC/100 ml) of ARGs in raw sewage of the conventional and the Enviro-Septic WWTP were 8.6 and 7.3 for <em>tet</em>W, 9.4 and 8.1 for <em>sul1</em>, 8.4 and 6.3 for <em>bla</em><sub>TEM</sub>, respectively. Both treatments achieved reductions of 2.9–3 log<sub>10</sub> for all ARGs. All river samples tested positive for the three ARGs, with lower concentrations at less fecally polluted sites, showing a reduction of up to 4 log<sub>10</sub>. Strong correlations (p < 0.05) were observed between culturable indicators, CrAssPH, and ARGs (ρ 0.58–0.96), indicating a strong association between ARGs and human fecal contamination, although other environmental sources cannot be ruled out. This study provides insights into ARG dynamics and supports strategies to mitigate their spread, and protect public health.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"374 ","pages":"Article 126179"},"PeriodicalIF":7.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transport mechanisms and fate of neonicotinoids in the soil-water systems under the effects of wetting-drying cycles and rice cultivation

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution

Pub Date : 2025-04-01 DOI: 10.1016/j.envpol.2025.126181

Shu Ji , Haomiao Cheng , Tengyi Zhu , Hanyang Xu , Guanlong Tang , Jian Zhang , Fukan Yang , Haohan Yang

Neonicotinoids (NEOs), the most widely used class of insecticides in global agriculture, pose environmental risks due to their persistence and mobility. Despite their extensive application, the transport mechanisms and fate of NEOs in agroecosystem remain unclear. This study investigated the spatial-temporal dynamics mechanisms of six typical NEOs (i.e., clothianidin (CLO), imidacloprid (IMI), acetamiprid (ACE), thiamethoxam (THM), dinotefuran (DIN), and nitenpyram (NIT)) under the effects of different water managements and rice cultivation in soil-water systems. After 61 days incubation, the dissipation in the soil-water systems were the dominated fate of NEOs (accounting for 96.3 ± 3.1 %), followed by storage in soils (2.6 ± 1.2 %), dissolution in interstitial water (0.7 ± 0.5 %) and overlying water (0.1 ± 0.1 %), and leakage in leakage water (0.3 ± 0.3 %). Both wetting-drying cycles and rice cultivation accelerated the NEOs dissipation. The possible reasons for this phenomenon were the wetting-drying cycles and rice cultivation stimulated NEO-degrader (i.e., Pseudomonas) growth in topsoil. Compared to flooding no rice treatment (half-life = 15.5 ± 4.4 days), the severe wetting-drying cycle with rice cultivation reduced NEO half-lives to 10.5 ± 3.1 days. The residual amounts of NEOs in each treatment were negatively (p < 0.05) correlated with the water solubility (CLO > IMI > ACE > THM > DIN > NIT), with the topsoil acting as the primary NEOs sink (41.6 % of total residues). The concentration of NEOs in the water phase decreased by 74.5 % from overlying water to leakage water, which due to the filtering effect of soils. The findings provide a scientific theoretical basis for the further prevention, control, and remediation of NEO pollution in agroecosystem.

{"title":"Transport mechanisms and fate of neonicotinoids in the soil-water systems under the effects of wetting-drying cycles and rice cultivation","authors":"Shu Ji , Haomiao Cheng , Tengyi Zhu , Hanyang Xu , Guanlong Tang , Jian Zhang , Fukan Yang , Haohan Yang","doi":"10.1016/j.envpol.2025.126181","DOIUrl":"10.1016/j.envpol.2025.126181","url":null,"abstract":"<div><div>Neonicotinoids (NEOs), the most widely used class of insecticides in global agriculture, pose environmental risks due to their persistence and mobility. Despite their extensive application, the transport mechanisms and fate of NEOs in agroecosystem remain unclear. This study investigated the spatial-temporal dynamics mechanisms of six typical NEOs (<em>i.e</em>., clothianidin (CLO), imidacloprid (IMI), acetamiprid (ACE), thiamethoxam (THM), dinotefuran (DIN), and nitenpyram (NIT)) under the effects of different water managements and rice cultivation in soil-water systems. After 61 days incubation, the dissipation in the soil-water systems were the dominated fate of NEOs (accounting for 96.3 ± 3.1 %), followed by storage in soils (2.6 ± 1.2 %), dissolution in interstitial water (0.7 ± 0.5 %) and overlying water (0.1 ± 0.1 %), and leakage in leakage water (0.3 ± 0.3 %). Both wetting-drying cycles and rice cultivation accelerated the NEOs dissipation. The possible reasons for this phenomenon were the wetting-drying cycles and rice cultivation stimulated NEO-degrader (<em>i.e</em>., <em>Pseudomonas</em>) growth in topsoil. Compared to flooding no rice treatment (half-life = 15.5 ± 4.4 days), the severe wetting-drying cycle with rice cultivation reduced NEO half-lives to 10.5 ± 3.1 days. The residual amounts of NEOs in each treatment were negatively (<em>p</em> < 0.05) correlated with the water solubility (CLO > IMI > ACE > THM > DIN > NIT), with the topsoil acting as the primary NEOs sink (41.6 % of total residues). The concentration of NEOs in the water phase decreased by 74.5 % from overlying water to leakage water, which due to the filtering effect of soils. The findings provide a scientific theoretical basis for the further prevention, control, and remediation of NEO pollution in agroecosystem.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"373 ","pages":"Article 126181"},"PeriodicalIF":7.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0