Environmental Pollution最新文献

{"title":"Mobility of antimony during Sb(V)-bearing jarosite transformation: Influence of desferrioxamine B and oxalic acid","authors":"Qi Huang ,&nbsp;Xiaohu Jin ,&nbsp;Zirui Hu ,&nbsp;Ziwen Zhong ,&nbsp;Yitao Cai ,&nbsp;Qian Yao ,&nbsp;Xiaofei Li ,&nbsp;Xueqin Tao ,&nbsp;Zhi Dang ,&nbsp;Guining Lu","doi":"10.1016/j.envpol.2025.127197","DOIUrl":"10.1016/j.envpol.2025.127197","url":null,"abstract":"<div><div>Antimony (Sb) pollution is becoming a non-negligible issue due to its toxic and carcinogenic properties. In mining areas, jarosite is a main host mineral for Sb(V), and its transformation may seriously influence the fate of Sb. In this study, we examined the transformation of Sb(V)-coprecipitated jarosite in the presence of oxalic acid (OA) and Desferrioxamine B (DFOB), and explored the resulting repartition of Sb. Results showed that OA and DFOB retarded jarosite dissolution but promoted Fe(III) and Sb(V) release, playing a combined role in this retardation and promotion. In treatment without OA or DFOB, jarosite transformed into hematite and goethite. In DFOB-only systems, DFOB did not change the jarosite transformation pathway; goethite and hematite were still the dominant products, and aqueous Fe(III)-DFOB complexes were formed. In OA-only systems, the re-adsorption of aqueous Fe(III)-OA complexes on the mineral surface may result in another recrystallization pathway, forming goethite. In OA-DFOB systems, DFOB competed with OA for Fe(III), forming Fe(III)-DFOB complexes and delayed OA-induced jarosite transformation into goethite. By the end of all reactions, more than 99.94 % of total Sb was retained by neo-formed secondary Fe(III) minerals. OA drove more Sb to become phosphate-extractable, and DFOB drove the above phosphate-extractable Sb into poorly crystalline phases or residual phases.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"386 ","pages":"Article 127197"},"PeriodicalIF":7.3,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145203294","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}

{"title":"Mitigating light pollution through motion-controlled LED lighting to protect bats","authors":"Christine Reusch ,&nbsp;Detlev Kelm ,&nbsp;Christian C. Voigt","doi":"10.1016/j.envpol.2025.127204","DOIUrl":"10.1016/j.envpol.2025.127204","url":null,"abstract":"<div><div>Light pollution is increasingly recognised as a pollutant that affects both humans and wildlife. Recently, an increasing number of roads and cycle paths have been illuminated by motion-controlled lighting, yet the adverse effects on nocturnal wildlife, such as bats, have so far prevailed. We investigated whether negative impacts could be mitigated by combining part-night lighting (switch off between 2300 and 500 h) with motion-controlled lighting and short lighting intervals using warm-colored light-emitting diodes (LEDs). Over a four-month period, we measured the acoustic activity of bats in several sections of a cycle path in two environments: a peri-urban area and an ecologically sensitive rural area. In the peri-urban section, we also tested whether 20-s light intervals had a lesser impact on bats than 40-s intervals. In the rural section, we tested whether amber light alleviates the adverse effects on sensitive forest-affiliated species. In the peri-urban area, the lighting scheme did not negatively impact bats, irrespective of the lighting duration. In the rural section, we observed that forest-specialist bat activity decreased in response to amber light at dusk but not at dawn. However, the activity of most other bat species remained unaffected. We conclude that a combination of part-night and motion-controlled lighting may mitigate the negative effects of artificial light on bats. However, we acknowledge that our study focused on a single bicycle trail. Furthermore, the negative response of forest-specialist bats to amber light emphasizes that even warm-colored LEDs can affect light-sensitive species — a problem that is likely to be exacerbated when trails are used more frequently. Using motion sensors to manage LED lighting on demand and switch it off completely in the middle of the night could be an effective way to reduce light pollution along bicycle trails, roads and in residential areas.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"386 ","pages":"Article 127204"},"PeriodicalIF":7.3,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145209361","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}

{"title":"Using explainable machine learning to better understand the environmental and socioeconomic contributions to preterm birth","authors":"Shuyu Li ,&nbsp;Yuqing Dai ,&nbsp;Ying Chen ,&nbsp;Fang Liu ,&nbsp;Jun Zhang","doi":"10.1016/j.envpol.2025.127183","DOIUrl":"10.1016/j.envpol.2025.127183","url":null,"abstract":"<div><div>Preterm birth (PTB) remains a leading cause of child mortality, yet the role of ambient air pollution remains disputed. In a cohort of 52,642 singleton births in Southwest China (2020–2023), we combined an automated machine-learning (AutoML) method with SHapley Additive exPlanations (SHAP) to rank and quantify 12 environmental, clinical, and sociodemographic predictors of PTB. Environmental factors collectively explained 48.5 % of the importance of the model features, with residential ambient PM_2.5 (20.7 %), elevation (17.3 %), and the normalized difference vegetation index (NDVI, 10.5 %) emerging as the top three contributors. The exposure–response curve demonstrated a marked increase in PTB risk above a PM_2.5 threshold of 50 μg/m³, with a mean SHAP value of 1.81 (CI: 1.75–1.87). The adverse effects of PM_2.5 were amplified among mothers with low educational levels (mean SHAP value 1.85 vs. 1.78 in the high education group) and varied by infant sex, with female infants exhibiting greater susceptibility when PM_2.5 concentrations were in the highest exposure bin (50–80 μg/m³). This study introduces a reproducible AutoML–SHAP framework for comprehensive PTB risk quantification and highlights that stringent air-quality control, coupled with targeted interventions, could substantially reduce prematurity.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"386 ","pages":"Article 127183"},"PeriodicalIF":7.3,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145209368","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}

{"title":"Understanding the Interactions between Uncaptured Landfill Plume Contaminants, Soil, Groundwater Resources, Public Health Systems, and their Implications","authors":"Joseph Omeiza Alao","doi":"10.1016/j.envpol.2025.127190","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.127190","url":null,"abstract":"Uncaptured landfill leachate plumes (ULLPs) remain one of the critical environmental challenges due to their infiltration into soil, polluting the groundwater resources with potentially toxic elements (PTEs) in various scenarios and seasons. This study pioneers the application of ground magnetic survey (GMS), 3D electrical resistivity tomography (ERT), and hydrochemical water analysis (HWA) data to examine the intricate interactions between ULLPs and the environment, which inversely affect public health. The results indicate elevated levels of PTEs in the sampled groundwater varying between 0.029–1.811mg/l, heightening alarmingly high contaminants. The resistivity data indicate that the overburden topsoil layers vary in resistivity between 1.4–600 Ωm, with the affected zone having lower resistivity values of 1.4 – 10 Ωm, occurring with 0.0 – 5.7 m. The second subsurface layer exhibits 12 – 200 Ωm, heightening partially affected regions, while the basement rock displays &gt;1000Ωm, remains unaffected, indicating potential barriers to leachate mobility. Magnetic data reveals critical insights into the landfill site’s condition with a total magnetic intensity (TMI) that varies significantly between 31100 – 37500 nT in unaffected zones, 31100 – 41500 nT within and off-landfill site, and 37500 – 39500 nT for mixed-materials zones within the landfill site. The TMI values between 39000 – 41500 nT in the affected zone occur within 0.0 – 5.0 m depths. The TMI values exceeding 41500 nT heighten the ferro-material dominant within the landfill, which further exacerbates the environmental risks associated with ULLPs. Findings indicate that the ULLP contaminants have impacted the integrity of groundwater with hazardous implications for public health. The combined ERT, GMS, and HWA provide an improved technique for detecting and mapping ULLP contaminants, capturing vital information needed for guiding safe waste disposal, groundwater conservation, and protection of public health.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"39 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145209359","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}

{"title":"Polystyrene nanoplastics induce ovarian injury by PI3K-Akt pathway-driven macrophage extracellular trap formation","authors":"Yingying Chen ,&nbsp;Linli Yang ,&nbsp;Yuanyuan Li ,&nbsp;Lulu Si ,&nbsp;Hanlin Fu ,&nbsp;Tianjiao Lai ,&nbsp;Ruixia Guo","doi":"10.1016/j.envpol.2025.127203","DOIUrl":"10.1016/j.envpol.2025.127203","url":null,"abstract":"<div><div>Nanoplastics (NPs), an emerging and increasingly prevalent environmental pollutant, pose a significant threat to organisms. Although recent research has begun to elucidate the mechanisms underlying ovarian toxicity induced by NPs, the involvement of cellular interactions, particularly those involving immune cells, in ovarian injury remains poorly understood. Here, we established a murine model exposed to polystyrene nanoplastics over an 8-week period to explore the role of macrophages in NPs-induced ovarian injury. Our <em>in vivo</em> results demonstrated that NPs accumulated in ovarian tissues, leading to ovarian endocrine disruption and follicular atresia, concomitant with macrophages infiltration and the formation of macrophage extracellular traps (METs). Complementary investigation using a co-culture system of macrophages and granulosa cells (GCs) indicated that NPs-induced METs triggered pyroptosis of GCs, and this biological crosstalk could be mitigated by DNase I. Further transcriptomic analysis revealed that NPs prompted macrophages to release METs through activating the PI3K-Akt signaling pathway. Notably, LY294002, a specific inhibitor of the PI3K-Akt pathway, significantly suppressed METs formation and consequently rescued GCs pyroptosis and ovarian injury induced by NPs. In summary, our findings uncover the mechanistic role of METs in exacerbating ovarian injury induced by NPs, and highlight the PI3K-Akt signaling pathway as a potential therapeutic target.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"386 ","pages":"Article 127203"},"PeriodicalIF":7.3,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145209362","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}

{"title":"Radionuclides baseline assessment of water resources, sediments, source rocks, and NORM flux simulation prior to shale gas development in Brazil","authors":"Gustavo Filemon Costa Lima ,&nbsp;Hugo Guimarães Martins ,&nbsp;Eduardo Duarte Marques ,&nbsp;Rubens Martins Moreira ,&nbsp;Emmanoel Vieira Silva-Filho ,&nbsp;Carlos Alberto de Carvalho Filho","doi":"10.1016/j.envpol.2025.127200","DOIUrl":"10.1016/j.envpol.2025.127200","url":null,"abstract":"<div><div>Hydraulic fracturing (fracking) is a controversial yet profitable technique used to stimulate ultra-low permeability reservoirs in unconventional hydrocarbon production. A significant environmental concern associated with fracking is its potential to mobilize radionuclides, leading to contamination aquifers, sediments, and surface waters. Despite this risk, the potential for radionuclide contamination in watersheds due to unconventional oil and gas operations is frequently underestimated, resulting in hazardous consequences globally, including health risk and ecosystem damage. One effective approach to mitigating such risks is establishment of environmental baselines prior to shale gas development. This study aims to establish a radionuclide baseline for surface water, groundwater, sediments, and source rocks in the São Francisco Basin (Brazil), prior to the introduction of unconventional gas production. The study also simulates radionuclide flux in produced water, a byproduct of hydraulic fracturing, and assesses annual dose of radioactivity exposure using Monte Carlo simulations. Radionuclides U-238, Th-232, K-40, Pb-210, Ra-226, and Ra-228 were analyzed using Neutron Activation Analysis (NAA) and gamma spectrometry. Environmental thresholds and geochemical background were calculated using 2mMAD (Median Absolute Deviation) whereas a multivariate statistical analysis was performed through Principal Components Analysis using Compositional Data transformations. A Monte Carlo simulation, based on 10,000 iterations, was used to compare potential NORM flux from fracking with natural background levels and those in other shale plays worldwide. Current radionuclide concentrations in water resources are low, however the NORM flux and Annual Exposure simulations indicate a potential radiological risk to water security in the event of unconventional gas production. This research provide novel insights into the NORM-related risks of fracking in the São Francisco Basin, offering a foundation for further assessments before shale gas development, which can be also used in unconventional reservoirs around the world.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"386 ","pages":"Article 127200"},"PeriodicalIF":7.3,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145203757","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}

{"title":"Synthetic phenolic antioxidants in paddy soils from central China: Contamination characteristics and risk prioritization analysis","authors":"Mohan Ma ,&nbsp;Meng Gao ,&nbsp;Zixiao Zhao ,&nbsp;Siyuan Li ,&nbsp;Yimeng Si ,&nbsp;Liman Wei ,&nbsp;Yiting Ge ,&nbsp;Yu Wang ,&nbsp;Feng Li ,&nbsp;Bing Li ,&nbsp;Chunguang Liu ,&nbsp;Fei Ge ,&nbsp;Hongwen Sun","doi":"10.1016/j.envpol.2025.127198","DOIUrl":"10.1016/j.envpol.2025.127198","url":null,"abstract":"<div><div>The contamination characteristics and ecological risks of synthetic phenolic antioxidants (SPAs) in agricultural soils remain poorly understood. In this study, 20 SPAs and 4 of their transformation products were analyzed in paddy soils from the Dongting Lake Basin in central China. The median total concentration of the 20 SPAs (Σ₂₀SPAs) was 147 ng/g (range, 27.6–612 ng/g), while their transformation products had a median concentration of 127 ng/g (range, 36.4–625 ng/g). Among the target compounds, pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate) (Ir1010), and 2,6-di-tert-butyl-4-methylphenol (BHT) were identified as the predominant contaminants. Spatial distribution analysis revealed that certain sites in the eastern Dongting Lake Basin exhibited notably higher concentrations of transformation products compared to other areas, indicating potential regional variability in the transformation behavior of SPAs. Furthermore, the detected SPAs and their transformation products posed potential ecological risks to paddy soil ecosystems, with cumulative risk quotient values reaching up to 23.6. The toxicological priority index values of Ir1010 and 2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diylbis(2-methylpropane-2,1-diyl)bis(3-(3-(tert-butyl)-4-hydroxy-5-methylphenyl)-propanoate) (Ir80) ranked relatively high (0.61 and 0.53, respectively), warranting greater attention. This study provides new insights into the co-occurrence of SPAs and their transformation products in paddy soils, and underscores the complex environmental risks associated with these emerging contaminants.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"386 ","pages":"Article 127198"},"PeriodicalIF":7.3,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145203295","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}

{"title":"Pilot scale treatment of PFAS-contaminated groundwater in a subsurface flow constructed wetland–evaluating multiple plant species","authors":"Oscar Liljeström ,&nbsp;Dahn Rosenquist ,&nbsp;Dan B. Kleja ,&nbsp;Anja Enell ,&nbsp;Lutz Ahrens","doi":"10.1016/j.envpol.2025.127199","DOIUrl":"10.1016/j.envpol.2025.127199","url":null,"abstract":"<div><div>Groundwater contamination by per- and polyfluoroalkyl substances (PFAS) is an emerging threat to drinking water quality, highlighting the need for effective treatment solutions. This study investigated subsurface flow constructed wetlands for treating groundwater contaminated with PFAS. The wetlands used a peat, biochar, and lightweight expanded clay aggregate (LECA) filter substrate, planted with either tufted sedge (<em>Carex elata</em>), fiber hemp (<em>Cannabis sativa</em> Futura 75), or an intercropping of the two <em>Salix</em> clones S. Wilhelm and S. Loden. The experiment was conducted under field conditions in Sweden, during one growing season, using PFAS-contaminated groundwater impacted by landfill leachate. The study showed accumulation of PFAS in all plant species and the peat and biochar part of the filter substrate, with short-chain PFAS and perfluoroalkyl carboxylates (PFCAs) dominating when considering the whole plants (57 % and 77 % of ƩPFAS, respectively) and long-chain PFAS and perfluoroalkyl sulfonates (PFSAs) dominating in the peat and biochar filter substrate (77 % and 54 % of ƩPFAS, respectively). Sorption to the filter substrate was shown to be the primary mechanism for PFAS removal. The highest plant PFAS concentrations were found in leaves, followed by roots, for all species. There was a difference in the PFAS composition profile when comparing different plant tissues, with PFCAs dominating in leaves (84 % of ƩPFAS) and PFSAs dominating in roots (66 % of ƩPFAS). All plant species were determined to have an above-ground tissue/water phase concentrations &gt;10/1 for C₃-PFCA (PFBA). This was also observed for <em>C. sativa</em> with C₄- and C₇-PFCAs (PFPeA, PFOA), and C₄- and C₅-PFSAs (PFBS, PFPeS), for <em>C. elata</em> with C₈-PFSA (L-PFOS), and for S. Loden with PFPeA. ∑PFAS phytoextraction potential from landfill leachate-impacted groundwater (mg/ha yr) was estimated to be 940 ± 670 for <em>C. sativa</em>, 390 ± 310 for S. Loden, 330 ± 160 for S. Wilhelm, and 160 ± 56 for <em>C. elata</em>.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"386 ","pages":"Article 127199"},"PeriodicalIF":7.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145203298","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}

{"title":"Life cycle analysis of mechanical recycling vs. conventional incineration for brominated acrylonitrile butadiene styrene (ABS) derived from WEEE","authors":"Imane Belyamani ,&nbsp;Layla Gripon ,&nbsp;Eric Lafranche ,&nbsp;Laurent Cauret","doi":"10.1016/j.envpol.2025.127196","DOIUrl":"10.1016/j.envpol.2025.127196","url":null,"abstract":"<div><div>This study provides the first comprehensive life cycle assessment (LCA) comparing pre-mechanical recycling methods for acrylonitrile butadiene styrene (ABS) from waste electrical and electronic equipment (WEEE) containing restricted brominated flame retardants (BFRs). By evaluating the environmental impacts of BFR extraction techniques, this research addresses a critical gap in prior studies that predominantly focused on extraction efficiency. This research identifies BFR removal, required for compliance with EU Regulation 2019/1021, as the most environmentally impactful stage of the recycling process. While ABS recycling was found to offset 60–100 % of environmental impacts compared to virgin production, particularly in resource consumption and global warming, energy consumption emerged as a key factor influencing environmental performance across most extraction methods. Among the techniques analyzed, Soxhlet extraction exhibited the lowest environmental impact, followed by supercritical CO₂ and flask-shake solvent extractions. In contrast, the dissolution-precipitation method demonstrated a significantly higher environmental footprint due to its reliance on organic solvents, which contribute 80–90 % of impact categories such as greenhouse gases (GHG) emissions (19.69 kg CO₂ eq.) despite the high solvent recycling efficiency of 80 %. The findings also revealed that mechanical recycling, when combined with extraction techniques, is more environmentally favorable than incineration in terms of abiotic resource depletion. Nonetheless, incineration remains the most viable option when considering overall environmental performance metrics. This study underscores the urgent need for BFR extraction optimization to enhance the sustainability of brominated plastic WEEE mechanical recycling.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"386 ","pages":"Article 127196"},"PeriodicalIF":7.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145203758","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}

{"title":"Effects of freshwater salinity on suspended sediment settling during different high-turbidity events","authors":"Mengmeng Li ,&nbsp;Qizhong Guo ,&nbsp;Liang Chen ,&nbsp;Paul H. Fallgren","doi":"10.1016/j.envpol.2025.127195","DOIUrl":"10.1016/j.envpol.2025.127195","url":null,"abstract":"<div><div>Understanding the changes in suspended sediment settling during high-turbidity events (HTEs) under different salinity conditions—from freshwater to mildly saline (0–2 ppt)—is important for assessing risks to aquatic life. Hydrostatic settling experiments were conducted with different salinity levels (electrical conductivity [EC] = 0.3, 0.4, 0.8, 1.2, and 2.0 mS/cm) and initial suspended sediment concentrations (SSCs; turbidity = 400, 800, and 1200 NTU) to evaluate the effects of salinity on sedimentation after HTEs. Compared to the control set (EC = 0.3 mS/cm), increasing initial salinity inhibited the settling velocity of suspended sediment particles (SSPs) for 44–600 min during the early settling stage. In this stage, the hindering effects of liquid density and viscosity dominated the settling rather than flocculation. A similar trend was observed when SSC was the single variable: compared to the 400 NTU set, the increase in the cumulative turbidity reduction ratio in the 800 and 1200 NTU sets was delayed by 40–400 min. Overall, increasing salinity level and initial SSC accelerated SSP settling throughout the experiments. The total mean turbidity reduction rate was positively correlated with salinity level and initial SSC (0.07–0.94 NTU/min). However, at high initial SSC (turbidity ≥1200 NTU), the acceleration effect of slightly saline levels (EC ≤ 0.8 mS/cm) was negligible.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"386 ","pages":"Article 127195"},"PeriodicalIF":7.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145195449","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}