Journal of contaminant hydrology最新文献

{"title":"Heavy metal adsorption isotherms on tailor-made brittle micas in water treatment applications","authors":"Francisco J. Osuna ,&nbsp;Esperanza Pavón ,&nbsp;María D. Alba","doi":"10.1016/j.jconhyd.2026.104883","DOIUrl":"10.1016/j.jconhyd.2026.104883","url":null,"abstract":"<div><div>The removal of heavy metals from water is a critical challenge because of their high toxicity, persistence, and bioaccumulation in biological systems. Adsorption is widely recognised as a cost-effective and efficient treatment method, and equilibrium isotherms are essential for evaluating the performance of adsorbents. Here, the equilibrium isotherms of Pb²⁺, Cd²⁺ and Hg²⁺ adsorbed onto synthetic brittle micas, specifically as-made (Na-M2) and thiol-functionalised (MEA-M2) one, have been systematically analysed. Na-M2 exhibited a remarkably high adsorption capacity, up to ten times higher than conventional adsorbents (1402, 1111 and 1717 mmol/kg for Pb²⁺, Cd²⁺ and Hg²⁺). Despite its lower overall capacity, MEA-M2 demonstrated superior Hg²⁺ uptake (955 mmol/kg) compared to other thiol-functionalised materials. However, the high layer charge of MEA-M2 limited the access to thiol groups. Finally, the adsorption mechanism and the adsorption energy depended on both the nature of the heavy metal and the grafting, providing information on the structure-performance relationships for water treatment applications.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"278 ","pages":"Article 104883"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146201760","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":"Assessing multi-trophic aquatic community responses to reclaimed water discharge in an arid urban river system","authors":"Chi Ma ,&nbsp;Wenchao Sun ,&nbsp;Yi Zhu ,&nbsp;Jingshan Yu ,&nbsp;Guoqiang Wang ,&nbsp;Qimeng Yue ,&nbsp;Zhiwen Yi ,&nbsp;Hu Xu ,&nbsp;Jianping Jia","doi":"10.1016/j.jconhyd.2026.104901","DOIUrl":"10.1016/j.jconhyd.2026.104901","url":null,"abstract":"<div><div>Reclaimed water replenishment plays a crucial role in sustaining urban river systems in arid regions where natural water resources are scarce. However, its ecological impacts, particularly on microbial community diversity and structure, remain insufficiently understood, with significant knowledge gaps regarding how reclaimed water replenishment influences these dynamics. Here, we quantified changes in water quality and multi-trophic community structure along natural (NR), reclaimed (RR), and mixed (NRR) sections of the Xiaohei River, an arid urban river in northern China. The results indicate that reclaimed water discharge altered the physicochemical conditions of the river systems, particularly in terms of nutrient enrichment, with total nitrogen and total phosphorus concentrations increasing on average by 67% and 84%, respectively. After reclaimed water replenishment, significant shifts in community composition and diversity were observed, with the mean richness of algae and metazoans increasing by 20.2% and 29.7%, respectively, while that of bacteria and protozoa decreased by 19.6% and 4.1%. Nitrogen and phosphorus nutrients, together with hydrodynamic conditions, emerged as the primary drivers of biodiversity variation, with particularly strong associations observed for bacterial, algal, and protozoan communities. <em>Chlorophyta</em> and <em>Rotifera</em> displayed contrasting responses to reclaimed water replenishment, with <em>Chlorophyta</em> exhibiting a monotonic linear response and <em>Rotifera</em> showing a nonlinear (hump-shaped) relationship with physicochemical gradients, underscoring differential responses across trophic levels. This study improves understanding about the ecological effects of reclaimed water replenishment on aquatic ecosystems. It provides a scientific basis for nutrient control and ecological monitoring to support coordinated water allocation and ecological conservation in arid urban river systems.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"278 ","pages":"Article 104901"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147306318","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":"Fate of dissolved pharmaceutically active compounds (PhACs) in irrigation water in rice paddy: Implications to human and soil health","authors":"Anwesha Mukhopadhyay ,&nbsp;Ashutosh Kumar ,&nbsp;Sonali Banerjee ,&nbsp;Sonam Jha ,&nbsp;Saibal Ghosh ,&nbsp;Balaram Mohapatra ,&nbsp;Pradip Bhattacharyya ,&nbsp;Abhijit Mukherjee","doi":"10.1016/j.jconhyd.2026.104898","DOIUrl":"10.1016/j.jconhyd.2026.104898","url":null,"abstract":"<div><div>Pharmaceutically active compounds (PhACs) may enter the food chain through food crops. This study investigates the influence of dissolved PhACs in irrigation water on rice crops and soil, identifying enduring implications on human and soil health. We conducted a field-scale experiment to investigate the accumulation and impacts of two prevalent PhACs, ibuprofen (IBP) and caffeine (CAF), in irrigation water on rice paddies under realistic agronomic conditions. The experiment was carried out in designated subplots with three dosage levels. The results revealed that IBP exhibited higher persistence in the field soil, leading to ∼2 times higher plant uptake than CAF. Most of the introduced contaminants attenuated in soil,root, shoot or degraded naturally, reducing grain accumulation, which ranged from 0.13% to 0.4% and from 0.38% to 1.4% for IBP and CAF, respectively. However, toxic PhAc metabolites were identified in the grains, raising significant concerns. Owing to its higher translocation and grain accumulation, the hazard quotient (HQ) of CAF surpassed 0.1, indicating a potential risk associated with regular dietary intake. The presence of PhACs significantly altered soil microbial enzyme activities, bacterial abundance, and community composition within the soil-plant microbiome, indicating potential long-term impacts on geo-health. In conclusion, the applied PhACs undergo significant attenuation within the field-soil and plant components, lowering grain accumulation; however, the presence of toxic PhAC metabolites in grains and changes in soil bacterial composition indicate potential concerns.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"278 ","pages":"Article 104898"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147306348","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":"Plastic movement in variably saturated porous media: The role of ionic strength and surface roughness","authors":"Yang Zhou ,&nbsp;Shoichiro Hamamoto ,&nbsp;Takuhei Yamasaki ,&nbsp;Takato Takemura ,&nbsp;Taku Nishimura","doi":"10.1016/j.jconhyd.2026.104869","DOIUrl":"10.1016/j.jconhyd.2026.104869","url":null,"abstract":"<div><div>We investigated colloid deposition mechanisms in saturated and unsaturated porous medias, focusing on roles of ionic strength (IS, 1–100 mM) and collector surface roughness. Through a customized column setup, experiments were conducted with smooth and rough (HF-etched) glass beads. Rough collectors featured fractal, multi-scale surface craters. Following colloid application, we evaluated released colloid via flushing with 0.4 mM NaHCO₃ solutions. Finally, column dissection was performed to quantify moderately and tightly attached colloids within the primary minimum. Increasing IS reduced mobile colloid while enhanced released, primary minimum moderately and tightly attached colloid. These trends align with DLVO theory when considering various sizes of positively charged heterogeneity (CH) on collector. As IS increased, colloid retention profiles (CRPs) shifted from nonlinear to linear, signaling a transition from unfavorable to favorable attachment. Under unsaturated conditions, colloid retention increased and exhibited linear CRPs at IS &gt;1 mM, driven by enhanced interception and air-water-solid (AWS) interfaces trapping. Roughness unexpectedly enhanced colloid mobility by reducing colloid delivery via larger hydrodynamic forces and weakening attachment on nanoscale surface roughness. Under saturated conditions, surface roughness minimally affected colloid tight attachment in primary minimum due to a trade-off between the inhibitory effect of nanoscale craters and the promotional effect of HF etching-induced additional CH. Conversely, under unsaturated conditions, collloid tight attachment in primary minimum was enhanced, resulting from additional CH formation and enhanced colloid trapping at AWS. These findings highlight the complex interplay between physical roughness and chemical factors, advancing our understanding of environmental colloid transport.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"278 ","pages":"Article 104869"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146173046","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":"Mapping the saltwater-freshwater interface by integrating electrical resistivity tomography and 3D numerical simulation","authors":"Juxiu Tong ,&nbsp;Zhao Yan ,&nbsp;Zulin Xu ,&nbsp;Bill X. Hu ,&nbsp;Jinwei Tong","doi":"10.1016/j.jconhyd.2026.104887","DOIUrl":"10.1016/j.jconhyd.2026.104887","url":null,"abstract":"<div><div>Seawater intrusion (SI) is a special groundwater salt pollution problem. Integrating numerical model and electrical resistivity tomography (ERT) method can better study the salt-freshwater interface (SFI). However, few studies have combined them to investigate SI. This research, conducted in Longkou city, Shandong province, China, synergistically employed both methods to assess SI. In November of 2020, fifty groundwater samples were collected from monitoring wells to measure Cl⁻ concentration. Seventeen survey lines were deployed, and ERT inversion profiles were generated accordingly. A three-dimensional numerical model simulating groundwater flow and solute transport was established with three vertical layers. The SFI was identified from eight typical ERT inversion profiles, with the closest and farthest interfaces located 1.8 km and 4.2 km from the coastline. The model effectively captured the actual groundwater flow field. It also demonstrated high performance in simulating Cl⁻ concentrations, with high <em>NES</em> (0.76 and 0.65) and <em>R</em>² (0.84 and 0.83) values, and low relative <em>RMSE</em> at wells W1–2 and W2–2. The SFI derived from ERT was further verified through numerical simulations. The first model layer exhibited the most severe SI, and it was selected as the focus for detailed analysis. In the wet season of June to August 2020, the simulated SFI shifted landward, and vice versa in the dry season. This integrated methodology offers an effective qualitative tool for locating SFI in coastal zones, supporting informed groundwater management and SI mitigation.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"278 ","pages":"Article 104887"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146173047","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":"RSM-ANN-GA framework for predictive modeling and optimization of sonocatalytic eosin dye degradation using ZnO@SiO2 nanocomposites","authors":"G.V. Aatral ,&nbsp;V. Chitra Devi ,&nbsp;S. Mothil ,&nbsp;R. Sathish Raam","doi":"10.1016/j.jconhyd.2026.104866","DOIUrl":"10.1016/j.jconhyd.2026.104866","url":null,"abstract":"<div><div>This study investigates the removal of Eosin Yellow, a xanthene-based synthetic dye with low biodegradability and high aquatic toxicity, from industrial wastewater using a ZnO@SiO₂ sonocatalyst. The effects of ultrasonic frequency, pH, catalyst dosage, initial dye concentration, and electrolytes on dye decolorization and Chemical Oxygen Demand (COD) reduction were examined. A hybrid modeling framework combining Artificial Neural Networks (ANN) and Response Surface Methodology (RSM) was developed to optimize the process. ANN architectures with 2, 4, 10, 16, and 20 hidden layers were evaluated, with hyperparameters tuned via Bayesian optimization. Model performance was assessed using MAE, RMSE, and R² with 95% confidence intervals, and parity plots with prediction intervals were generated to ensure predictive reliability. Comparative analysis demonstrated the superior predictive accuracy and generalization ability of the 10-layer ANN over RSM. Electrolyte addition influenced reaction kinetics, while optimization of process parameters enabled efficient dye removal and COD reduction. This work establishes a reproducible framework integrating sonocatalysis with computational intelligence, providing a robust approach for modeling, optimization, and mechanistic investigation of complex dye wastewater treatment systems.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"278 ","pages":"Article 104866"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146157261","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":"Assessing the impacts of afforestation on nitrogen load into the northern gulf of America","authors":"Ying Ouyang ,&nbsp;Johnny M. Grace ,&nbsp;Prem Parajuli ,&nbsp;Yongshan Wan ,&nbsp;Yanbo Huang","doi":"10.1016/j.jconhyd.2026.104885","DOIUrl":"10.1016/j.jconhyd.2026.104885","url":null,"abstract":"<div><div>Eutrophication of the northern Gulf of America (NGOA) (also known as northern Gulf of Mexico) due to excess nutrients has resulted in harmful algal blooms, the development of hypoxic zones, and negative impacts on seafood production, recreational activities, and marine transportation. With a growing recognition of afforestation to maximize timber production and improve water quality, there is a critical need to investigate impacts of afforestation on nitrogen (N) loads to the NGOA. Using the Pearl River Basin (PRB) located in Mississippi and Louisiana along with the HAWQS (Hydrologic and Water Quality System) model and the Kolmogorov-Smirnov (K<img>S) test, we assessed the impacts of afforestation (by converting all corn and soybean lands in the PRB to mixed-forest lands) on total nitrogen (TN) and nitrate-N loads to the NGOA over a 31-year period from 1990 to 2020. Simulations showed that average annual TN and nitrate-N loads were, respectively, 26% and 28% higher in the base scenario than in the afforestation scenario, with statistically significant differences based on the K<img>S test. The result indicates that afforestation contributed to a very significant reduction in annual N loading from the PRB to the NGOA, which could occur from enhancing N adsorption and immobilization within forest soils, reducing application of synthetic N fertilizers, and decreasing surface runoff after afforestation. Notably, the magnitude of N load reduction was not directly proportional to the area of cropland conversion, suggesting that other factors, including the specific location of afforestation (e.g., riparian zones), land slope, and the types of tree species planted, may also significantly influence N load. Two distinct daily TN loading phases were observed: 1) a slow-loading phase at daily streamflow ≤1200 m³ s⁻¹, and 2) a fast-loading phase at daily streamflow &gt;1200 m³ s⁻¹. These findings have not been reported in the literature and underscore the value of strategically designed afforestation for optimizing N load reduction in the Gulf region. Additionally, very few studies have investigated the impacts of afforestation on daily N load to the NGOA, and this study would help fill the research gap.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"278 ","pages":"Article 104885"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146207181","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":"Microbial community induced calcium carbonate precipitation: Growth characteristics, product traits, and thorium and uranium fixation","authors":"Junyan Yang ,&nbsp;Tan Wang ,&nbsp;Wanqi Zhang ,&nbsp;Tingting Zhang ,&nbsp;Jianhong Han ,&nbsp;Weida Wang","doi":"10.1016/j.jconhyd.2026.104882","DOIUrl":"10.1016/j.jconhyd.2026.104882","url":null,"abstract":"<div><div>Microbial-induced mineralization presents substantial prospects for heavy metal immobilization in environmental applications, where microbial consortia offer enhanced environmental adaptability and cost-effectiveness compared to single-strain approaches. This study employs carbonate-mineralizing microbial communities to induce CaCO₃ precipitation for the immobilization of Thorium (Th) and Uranium (U) in aqueous solutions. The microbial community A1, derived from rare earth waste residue, demonstrated strong urease activity and exhibited markedly enhanced growth and urease expression when cultivated with composite carbon‑nitrogen sources compared with single carbon sources. Under different culture conditions, the microbial community A1 consortium predominantly induced the formation of calcite-and vaterite-type calcium carbonate. The consortium achieved high removal efficiencies, eliminating up to 98.7% of Th (IV) and 96.5% of U(VI), with stable performance across varying concentrations. Mechanistic analyses revealed that thorium was primarily removed via adsorption onto calcium carbonate surfaces, whereas U(VI) was converted into uranyl carbonate and incorporated into the calcium carbonate lattice through co-precipitation. This study proposes an economical, efficient, and environmentally sustainable strategy for remediating aquatic environments contaminated with the radionuclides Th(IV) and U(VI).</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"278 ","pages":"Article 104882"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146213405","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":"Integrated monitoring of suspended sediment transport in a transboundary river basin: Insights into sediment fluxes and reservoir effects in the Thaya catchment","authors":"Stanislav Paseka ,&nbsp;Daniel Marton ,&nbsp;Michael Krapesch ,&nbsp;Helmut Habersack ,&nbsp;Martin Bednář ,&nbsp;Marlene Haimann","doi":"10.1016/j.jconhyd.2026.104896","DOIUrl":"10.1016/j.jconhyd.2026.104896","url":null,"abstract":"<div><div>Sediment transport plays a key role in riverine processes and water quality regulation, yet remains challenging to quantify, particularly in transboundary and regulated catchments. This study presents a coordinated, long-term monitoring approach across eight stations in the Thaya River basin (Austria and Czech Republic), combining turbidity sensors, flow data, and manual sampling. Relationships between turbidity and suspended sediment concentration were established through site-specific regression, with R² values exceeding 0.95 at three stations. Results revealed pronounced spatial variability in sediment loads, driven by land use, reservoir trapping, and tributary inputs. The Vranov, Znojmo and Nové Mlýny reservoirs significantly reduced sediment transport, although downstream recovery occurred due to tributary inflows. Maintenance requirements, sensor fouling, and deployment geometry strongly influenced data reliability, underscoring the need for standardized protocols in multi-site networks. The dataset enhances sediment budget estimation and reservoir sedimentation forecasts, supporting adaptive catchment-scale sediment management and meeting European water policy objectives.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"278 ","pages":"Article 104896"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146227115","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":"Exploring the effects of pH, ionic strength, and temperature on bisulfide sorption onto bentonite via experiments and numerical modelling","authors":"Sifat Azad Papry ,&nbsp;Reza Rahimi ,&nbsp;Tarek L. Rashwan ,&nbsp;Pulin Mondal ,&nbsp;Mehran Behazin ,&nbsp;Peter G. Keech ,&nbsp;Magdalena Krol","doi":"10.1016/j.jconhyd.2026.104886","DOIUrl":"10.1016/j.jconhyd.2026.104886","url":null,"abstract":"<div><div>The long-term performance of the Canadian deep geologic repository (DGR) relies significantly on bentonite clay, as sealing materials intended for use in the engineered barrier system (EBS). One particular safety concern is microbiologically influenced corrosion of the used fuel containers (UFCs) which may occur if bisulfide (HS⁻) transports through the bentonite buffer to reach the UFC surface and corrode the copper coating. Understanding HS⁻ sorption onto bentonite is therefore an important aspect of this problem, as HS⁻ sorption can reduce the extent of copper corrosion. However, sorption dynamics onto bentonite are not yet well-understood. As such, this study performed laboratory batch experiments to investigate HS⁻ sorption onto bentonite slurries as a function of temperature (10–40 °C), pH (9–11), and ionic strength (0.01 M–1 M NaCl). These conditions were aimed to reflect the range of possible DGR geochemical conditions. The experimental results showed that HS⁻ sorption onto bentonite increased with increasing temperature but decreased with increasing pH and ionic strength. A 3-way ANOVA (analysis of variance) showed that the variables' individual and 2-way interaction effects are statistically significant, which implies that they should be incorporated into a sorption mechanism. A thermodynamic-based sorption model was also developed in PHREEQC assuming that sorption was driven by three key processes: (i) redox reaction with the structural Fe³⁺ sites, (ii) surface precipitation as FeS (mackinawite), and (iii) surface complexation reactions with surface hydroxyl group (OH) at the edge sites of montmorillonite. The model successfully described the main experimental trends and provided valuable insights into the relative contribution of these processes to the total HS⁻ sorption mechanism. Altogether, this study provides novel insights from experimental and numerical modelling findings that enhance the understanding of HS⁻ sorption onto bentonite, in the context of Canadian DGR design as well as other nuclear repositories worldwide.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"278 ","pages":"Article 104886"},"PeriodicalIF":4.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146201949","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}