Journal of contaminant hydrology最新文献

{"title":"Metal treatment in stormwater bioretention systems with high hydraulic conductivity – Designed for more efficient runoff volume capture and cold climates","authors":"Robert Furén ,&nbsp;Katharina Lange ,&nbsp;Ali Beryani ,&nbsp;Maria Viklander ,&nbsp;Godecke-Tobias Blecken","doi":"10.1016/j.jconhyd.2025.104654","DOIUrl":"10.1016/j.jconhyd.2025.104654","url":null,"abstract":"<div><div>Bioretention systems are used to treat stormwater. Using coarser filter media than commonly recommended with high saturated hydraulic conductivities may increase annual runoff volume capture, facilitate smaller filters, less overflow and adaptation to cold winters. However, this may affect water quality treatment negatively. Therefore, we investigated total and dissolved metal treatment at three full scale bioretention systems with a coarse filter material and saturated hydraulic conductivities &gt;1500 mm/h in Malmö/Sweden. One bioretention system was designed with a coarse sand-based filter medium, another with coarse sand-based filter medium and a submerged zone and the third with a 50:50 mixture of coarse sand and pumice as filter medium. The study included 19 rain events, partly during winter season when road salt was applied. The results suggest that also filter media with high hydraulic conductivity can be an effective option when metal treatment is targeted. The two systems with coarse sand filter media treated total metals effectively with median removals &gt;80 % for Cu, Pb and Zn and median removals &gt;35 % for Ni and Cr. Dissolved metal treatment was variable reaching from effective treatment for dissolved Cu, Pb and Zn with median removals &gt;60 % to overall leaching of dissolved Cd, Ni and Cr. Applying a submerged zone did not showed benefits for total or dissolved metal removal. Further, treatment of total and partly dissolved metals was significantly impaired due to pumice addition of the filter media, discouraging pumice as a filter media amendment. Coarser filter materials could be recommended for sites with space limitations or when frozen ground is expected in winter. Further, they can generally reduce clogging risks and untreated overflows.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"274 ","pages":"Article 104654"},"PeriodicalIF":3.5,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Prediction of non-equilibrium transport of nitrate nitrogen from unsaturated soil to saturated aquifer in a watershed: Insights for groundwater quality and pollution risk assessment","authors":"Debao Lu ,&nbsp;Jian Ou ,&nbsp;Jinglin Qian ,&nbsp;Cundong Xu ,&nbsp;Hui Wang","doi":"10.1016/j.jconhyd.2025.104649","DOIUrl":"10.1016/j.jconhyd.2025.104649","url":null,"abstract":"<div><div>This study introduces an innovative integrated modeling framework to elucidate nitrate nitrogen migration within heterogeneous vadose zones, addressing key challenges in simulating non-equilibrium pollutant transport at the watershed scale. A novel in-situ device was developed for efficient, large-scale soil solute breakthrough curve (BTC) collection, critical for field-scale simulations. Fitting these BTCs, the Mobile-Immobile Model (MIM) (mean R² = 0.94) outperformed the Convection-Dispersion Equation (CDE) (mean R² = 0.88), underscoring the prevalence of non-equilibrium transport in the study area. Bootstrap resampling validated sample adequacy for estimating transport parameters <em>v</em> (velocity) and <em>D</em> (dispersion), with confidence intervals stabilizing below 10 %. The Ensemble improved Stream Tube Model (ESTM), incorporating Pearson Type III (P-III) distributions for transport variables (validated against lognormal; R² up to 0.92) and nitrate degradation/adsorption, significantly enhanced predictive precision. This model accurately predicted high pollutant concentrations during rainy seasons (NSE = 0.97) and reasonably estimated dry season low concentrations, despite slight overestimations attributed to sensor limitations at low moisture. When integrated with a groundwater solute transport model, the framework effectively simulated long-term nitrate dynamics in both vadose and saturated zones under fertilizer application, closely matching observations. Sensitivity analysis highlighted mean dispersion, its skewness, mean velocity, and adsorption as critical for non-equilibrium transport. Critically, by explicitly modeling <em>v</em> and <em>D</em> joint heterogeneity, our ESTM markedly outperformed traditional models in simulating early breakthrough and tailing (R² = 0.875 vs. 0.623). This research provides a robust, adaptable approach for understanding groundwater nitrate dynamics and pollutant fate across diverse environmental conditions.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"274 ","pages":"Article 104649"},"PeriodicalIF":3.5,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Preparation of novel multifunctional magnetic biochar integrating adsorption and degradation and application in printing and dyeing wastewater","authors":"Ruihui Gong ,&nbsp;Huidong Li ,&nbsp;Yuxin Liu ,&nbsp;Jiangzhe Fu ,&nbsp;Junming Yi ,&nbsp;Dongsheng Feng","doi":"10.1016/j.jconhyd.2025.104652","DOIUrl":"10.1016/j.jconhyd.2025.104652","url":null,"abstract":"<div><div>This study focuses on solving the urgent problem of water environment pollution caused by the discharge of organic dyes in high-concentration textile wastewater. A multifunctional magnetic biochar (MMBC-400) with adsorption and degradation functions was prepared by pyrolysis of corn cob and red mud demonstrating efficient handling of Malachite Green (MG). Compared with traditional adsorbents, MMBC-400 combines adsorption and catalytic degradation functions. The adsorption efficiency of MG was 99.19 %, and the adsorption capacity was 793.51 mg/g. The composite material has excellent stability and is still more than 90 % after 6 cycles. The composite material has excellent stability, and the adsorption efficiency is still greater than 90 % after 6 cycles. Kinetic and isothermal analyses showed that the chemisorption was dominated by multilayer adsorption. Meanwhile, the free radical (∙OH, SO- 4·) and non-radical (¹O₂, electron transfer) pathways were supplemented to realize the rapid degradation of MG, and the degradation efficiency was greater than 85 % after four regenerations. Characterization studies further confirmed the role of hierarchical pore structure, surface functional groups (e.g., -OH, Fe<img>O), and π-π interactions in pollutant binding. Despite the good experimental results achieved in laboratory scale, future work should address the issues of generalizable application and long-term stability in complex wastewater matrices. This work provides a sustainable strategy for dye removal through the reuse of agricultural and industrial wastes, realizing a paradigm shift from monofunctional materials to multifunctional remediation systems.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"274 ","pages":"Article 104652"},"PeriodicalIF":3.5,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Autonomous self-propelled reduced graphene oxide hydrogel-CuO@rGO micromotors for high-efficiency removal of organic dye pollutant","authors":"Zengze Liu ,&nbsp;Ziwei Zheng ,&nbsp;Yanlin Liu ,&nbsp;Xiaoqiu Yang ,&nbsp;Yangwei Chen ,&nbsp;Fang Tan","doi":"10.1016/j.jconhyd.2025.104650","DOIUrl":"10.1016/j.jconhyd.2025.104650","url":null,"abstract":"<div><div>This study featured about the synthesis of graphene oxide hydrogel-CuO@reduced graphene oxide (rGH-CuO@rGO) micromotors with core-shell structure via an ultrasonication-assisted chemical precipitation method and their application for catalytic dye degradation. The micromotors were comprehensively characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), spectroscopic techniques (Fourier transform infrared (FTIR), Raman), surface area measurement (BET), and X-ray photoelectron spectroscopy (XPS) to determine their microstructure, composition, and chemical states. Degradation performance for methylene blue (MB) was evaluated under varying conditions: reaction time (0–120 min), peroxymonosulfate (PMS) concentration (0–5 g·L⁻¹), pH (3–8), quantity of micromotors (12–24), and MB concentration (5–100 mg·L⁻¹). The removal rate of MB was achieved over 90 % within 120 min at pH 8. The micromotors demonstrated excellent catalytic efficiency, reusability and stability over four cycles. In the dual oxidant system (H₂O₂/PMS) the micromotors exhibited effective self-propulsion and stable MB removal. The generation of hydroxyl (•OH) and sulfate (•SO₄⁻) free radicals in the system was confirmed by electron paramagnetic resonance spectrometer (EPR). Ultra High Performance Liquid Chromatography Quadrupole Time-of-Flight Mass Spectrometry (UHPLC-QTOF/MS) was used to identify the degradation intermediates, and the possible MB degradation pathways were proposed. Moreover, the micromotors showed satisfactory performance in removing mixed dye wastewater and phenolic compound. Additionally, the low ecotoxicity of the micromotors was demonstrated by cytotoxicity assessment. This study provided a novel and valuable route to synthesizing self-driving micromotors with potential extensive applications in environmental remediation.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"274 ","pages":"Article 104650"},"PeriodicalIF":3.5,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Fabrication of sodium alginate-biochar-graphene oxide composite for sulfadiazine adsorption from aquatic environment: Performance and mechanisms","authors":"Xinying Zhang ,&nbsp;Fei Wang ,&nbsp;Nan Li ,&nbsp;Dehua Zhao ,&nbsp;Tao Xu ,&nbsp;Yirui Wang ,&nbsp;Anlei Wei","doi":"10.1016/j.jconhyd.2025.104647","DOIUrl":"10.1016/j.jconhyd.2025.104647","url":null,"abstract":"<div><div>The effective removal of sulfadiazine (SDZ), an emerging and persistent aquatic contaminant, remains a significant environmental challenge. In this study, a novel sodium alginate-biochar-graphene oxide composite (SA-BC-GO) was synthesized via crosslinking for efficient SDZ adsorption removal in aqueous environments. Characterization revealed a hierarchically porous architecture with a 2.6-fold increase in specific surface area compared to pristine SA, along with reinforced pore walls and enhanced mechanical stability. Batch adsorption experiments demonstrated a Langmuir maximum capacity of 51.91 mg/g at 308 K and 97.3 % SDZ removal efficiency within 7 h. Adsorption kinetics adhered to the pseudo-second-order model, while thermodynamic analysis indicated spontaneous and endothermic characteristics. Fixed-bed column studies further confirmed practical feasibility, achieving 98.7 % SDZ removal efficiency, with Thomas-model-described breakthrough behavior. Mechanistic investigations via XPS and FTIR analyses revealed that SDZ adsorption was governed by multiple interactions, including electrostatic attraction, π-π electron interaction, hydrogen bonding, and hydrophobic partitioning. Notably, SA-BC-GO retained 77.7 % of its adsorption capacity after five regeneration cycles, underscoring remarkable reusability. These findings established SA-BC-GO as a robust, reusable adsorbent, providing mechanistic insights and scalable potential for SDZ and other sulfonamide contaminants in aquatic environments.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"274 ","pages":"Article 104647"},"PeriodicalIF":3.5,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144291241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Copper ions removal in water by sodium alginate/sludge-derived humic acid aerogel: Adsorption mechanism and removal effect","authors":"Hongyu Wang ,&nbsp;Henglin Xiao ,&nbsp;Mengyuan Huang ,&nbsp;Zhengyang Wu ,&nbsp;Xibei Tan ,&nbsp;Bin Wang ,&nbsp;Wenbin Guo ,&nbsp;Rongfan Chen ,&nbsp;Wangye Lu ,&nbsp;Zihan Zheng ,&nbsp;Dao Zhou ,&nbsp;Ling Chen","doi":"10.1016/j.jconhyd.2025.104648","DOIUrl":"10.1016/j.jconhyd.2025.104648","url":null,"abstract":"<div><div>In this work, the sludge-derived humic acid (SHA), extracted from the remaining sludge of landfill leachate, was utilized to modify sodium alginate (SA) and prepare SA/SHA aerogel. The adsorption characteristics and underlying mechanisms of Cu(II) by SA/SHA aerogel in aqueous solutions were systematically investigated. The findings revealed that SA/SHA aerogel exhibited superior adsorption capabilities, with a maximum adsorption capacity for Cu(II) reaching 188.38 mg/g. The results aligned well with the pseudo-second-order kinetic model and the Langmuir isotherm model, indicating a uniform distribution of adsorption sites on the aerogel's surface, primarily driven by chemisorption-mediated monolayer adsorption of Cu(II). An examination of heavy metal leaching during the adsorption process confirmed the absence of secondary contamination in the solution after SA/SHA treatment. Studies on the presence of co-ions indicated that monovalent cations had a minimal impact on the selective adsorption of Cu(II) by SA/SHA aerogel, whereas divalent cations exerted a more significant influence. Furthermore, SA/SHA aerogel retained its structural integrity without disintegration even after five cycles of adsorption-desorption. Characterization techniques indicated that the adsorption mechanism of SA/SHA aerogel was dominated by complexation reactions and ion exchange of cations, supplemented by redox reactions.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"274 ","pages":"Article 104648"},"PeriodicalIF":3.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144291240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Disturbances of MPs on nitrogen in surface water: A case study of Chinese water bodies in the past three years","authors":"Hao Liu,&nbsp;Liqing Li","doi":"10.1016/j.jconhyd.2025.104642","DOIUrl":"10.1016/j.jconhyd.2025.104642","url":null,"abstract":"<div><div>Microplastics (MPs) are ubiquitous in surface waters, yet their impact on nitrogen concentrations remains underexplored. This study investigates the relationship between MPs and both ammonia nitrogen (NH₃-N) and total nitrogen (TN) through statistical analysis. Over the past three years, NH₃-N concentrations in Chinese rivers have ranged from 0.02 to 3.18 mg/L, while TN concentrations have varied between 0.741 and 10.18 mg/L. The abundance of MPs in these waters ranges from 1.75 to 1450.011 items/L. Research indicates that MPs can promote ammonification, leading to an increase in NH₃-N accumulation by inhibiting nitrification and nitrogen assimilation processes. Conversely, MPs accelerate the removal of TN by enhancing denitrification activity. The results reveal that electrical conductivity (EC) is a key mediating factor in the impact of MPs on nitrogen in water bodies (standardized path coefficient: 0.521). For the first time, this study identifies a threshold effect for MPs in surface waters: a threshold of 3.854 items/L (<em>P</em> &lt; 0.001) was determined, above which the efficiency of total nitrogen removal decreases. This research provides a theoretical foundation for understanding the impact of MPs on the nitrogen cycle in surface waters.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"274 ","pages":"Article 104642"},"PeriodicalIF":3.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144272291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Enhancing the dissolution of PCE with the mixed cyclodextrin-ethanol solution for aquifer remediation","authors":"Min Yuan ,&nbsp;Qunfang Wang ,&nbsp;Huirong Guo ,&nbsp;Panrui Yang ,&nbsp;Zhe Wang","doi":"10.1016/j.jconhyd.2025.104646","DOIUrl":"10.1016/j.jconhyd.2025.104646","url":null,"abstract":"<div><div>Groundwater contaminated by dense non-aqueous phase liquids (DNAPLs) such as chlorinated hydrocarbons is difficult to remediate. The combination of flushing agents has a synergistic solubilization effect on the removal of DNAPLs. However, the solubilization mechanisms of DNAPLs under the mixed flushing agent treatment remains poorly understood. In this work, the dissolution process of tetrachloroethylene (PCE) in Hydroxypropyl-β-cyclodextrin (HPCD)-ethanol mixed solution system was observed through one-dimensional (1D) capillary experiments. The mixed HPCD-ethanol solution has a synergistic solubilization effect on PCE dissolution, and the synergistic solubilization function curve of PCE was derived. Furthermore, the mixed HPCD-ethanol solution was used to investigate PCE removal process within a two-dimensional (2D) transparent micromodel. The results demonstrate that the combination of flushing agents significantly enhance PCE removal efficiency. The maximum dissolution rate of PCE under the flushing of the mixed solution was increased by a factor of 2–6 compared to single solution systems of ethanol or HPCD, and the flushing time was reduced by 40 %.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"274 ","pages":"Article 104646"},"PeriodicalIF":3.5,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144281071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Application of the FUCOM-SAW model for comprehensive risk assessment of contaminated sediments: A case study of the great Bačka Canal and Begej river","authors":"Slaven Tenodi,&nbsp;Dejan Krčmar,&nbsp;Đorđe Pejin,&nbsp;Dunja Rađenović Veselić,&nbsp;Nataša Slijepčević,&nbsp;Kristiana Zrnić Tenodi,&nbsp;Dragana Tomašević Pilipović","doi":"10.1016/j.jconhyd.2025.104644","DOIUrl":"10.1016/j.jconhyd.2025.104644","url":null,"abstract":"<div><div>Sediment pollution poses significant risks to aquatic ecosystems and human health, necessitating advanced risk assessment methodologies. This study employs a novel integration of the Full Consistency Method (FUCOM) and Simple Additive Weighting (SAW) to develop a comprehensive risk assessment model for contaminated sediments. The FUCOM-SAW model reduces subjectivity in weighting criteria, ensuring logical consistency, while incorporating factors such as pollutant mobility and bioavailability—key to understanding ecological and health risks. The model is applied to sediments from two heavily polluted sites in Serbia: the Great Bačka Canal (GBC) and Begej river. Key criteria, including inorganic and organic pollutants, ecological risks, and human health implications, were analyzed through a multi-criteria decision-making (MCDM) framework. Results reveal distinct risk profiles between the sites, with Begej exhibiting higher heavy metal contamination and ecological risks compared to GBC. The FUCOM-SAW model refines conventional regulatory classifications, identifying site-specific differences in sediment contamination levels and prioritizing remediation strategies. Sensitivity analysis confirms the robustness of the model under varying weight scenarios, ensuring its adaptability across different environmental contexts. This study demonstrates the potential of the FUCOM-SAW framework as a reliable tool for sediment risk management, offering an integrative approach that aligns with regulatory standards while addressing site-specific challenges. The findings provide actionable insights for optimizing resource allocation, minimizing environmental risks, and advancing sustainable sediment management practices.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"274 ","pages":"Article 104644"},"PeriodicalIF":3.5,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144272290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Transport of microplastics in a stream that receives the discharge of effluents from wastewater treatment plants of a medium-sized city in the southeast of the Buenos Aires province in Argentina","authors":"Sebastián Tognana ,&nbsp;Susana Montecinos","doi":"10.1016/j.jconhyd.2025.104643","DOIUrl":"10.1016/j.jconhyd.2025.104643","url":null,"abstract":"<div><div>Understanding how microplastics are transported in rivers and streams is very important since many times the sources of microplastic contamination, such as wastewater treatment plants, are located in such waterways. The transport process involves movement along the waterway and sedimentation and remobilization processes. For this reason, it is important to have data on concentrations of microplastics in both water and sediment. In this work, the concentration of microplastics in water and sediment was studied at different dates at two sites in a stream that receives discharge from treatment plants, finding different behaviors depending on the date. In particular, two dates were analyzed, one in which the concentration of microplastics decreased along the stream and another in which it increased. The influence of water velocity on the variation in concentration of microplastics in the water between the two sampling sites was analyzed, with a greater decrease observed at lower velocities. A spiraling metric was applied to analyze the results, finding that there is mostly no retention in the sediment. The results were discussed within the framework of an advection-dispersion equation considering a remobilization term from the sediment. The experimental results were more adequately described with the remobilization term dependent on the water velocity, this term being different between both dates and depending on the type of sediment. The limitation of considering only effluent discharge as a source of microplastics was analyzed.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"274 ","pages":"Article 104643"},"PeriodicalIF":3.5,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}