Journal of contaminant hydrology最新文献_第7页

Research on the carbon cycle of surface water-groundwater in the Jianghan Dongting Plain of the Yangtze River Basin, China 长江流域江汉洞庭平原地表水-地下水碳循环研究

IF 4.4 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology

Pub Date : 2025-12-17 DOI: 10.1016/j.jconhyd.2025.104812

Meiyan Hu , Peijiang Zhou , Chao Meng , Xiaobin Li , Xiaoxi Chen , Jingyi Xie , Shengkai Cao , Xiaodi Zhang , Zhen Ni , Guangshui Na

Carbon cycle research is the core foundation for understanding the root causes of climate change and developing effective emission reduction strategies. Carbon source-sink dynamics in the water ecologic environment is the key component of the carbon cycle in basins. Jianghan Dongting Plain of the Yangtze River Basin is rich in water resources, but lacks a comprehensive understanding on the carbon source-sink dynamics of water environment. The study integrated literature data and self-tested data to research the carbon source-sink dynamics in surface water and groundwater in the Jianghan Dongting Plain. The study found that there was a coupling effect of HCO₃⁻ and DOC between SW (surface water) and GW (groundwater) in the Jianghan-Dongting Plain of the central Yangtze River Basin. The HCO₃⁻ in surface water may come from the recharge of groundwater, and the DOC in the groundwater may come from the recharge of surface water. In addition, the high concentration of NH₄⁺-N in groundwater inhibited the release of DOC from the sediment into the groundwater. Decreasing of situation index (SI) values of calcite and dolomite from west to east indicated that under the coupling effect between surface water and groundwater, the water carbonate interaction was enhanced, leading to the carbon sink changing to be carbon source from west to east. The study clarified the spatial pattern of regional carbon effects of “ west sink and east source” for the first time, elevating carbon cycle research from a single water body to a system level of “surface water groundwater continuum”, successfully connecting micro biogeochemical processes with macro regional carbon cycle patterns, which is of great significance for carbon cycling research in the Yangtze River Basin and predicting future environmental changes.

碳循环研究是认识气候变化的根本原因，制定有效减排战略的核心基础。水生态环境中的碳源汇动态是流域碳循环的关键组成部分。长江流域江汉洞庭平原水资源丰富，但缺乏对水环境碳源汇动态的全面认识。本研究结合文献资料和自检资料，对江汉洞庭平原地表水和地下水碳源汇动态进行了研究。研究发现，长江流域中部江汉—洞庭平原地表水SW与地下水GW之间存在HCO3−与DOC的耦合效应。地表水中的HCO3−可能来自地下水的补给，地下水中的DOC可能来自地表水的补给。此外，地下水中高浓度的NH4+-N抑制了沉积物中DOC向地下水的释放。方解石和白云岩的SI值自西向东递减，说明在地表水和地下水的耦合作用下，水-碳酸盐相互作用增强，导致碳汇自西向东转变为碳源。该研究首次明确了“西汇东源”区域碳效应的空间格局，将碳循环研究从单一水体提升到“地表水-地下水连续体”的系统层面，成功地将微观生物地球化学过程与宏观区域碳循环格局联系起来，对长江流域碳循环研究和预测未来环境变化具有重要意义。

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引用次数: 0

Seasonal variability in the hydrogeochemical behavior and metal fluxes of acid mine drainage: Implications for long-term output and treatment 酸性矿井水的水文地球化学行为和金属通量的季节变化：对长期产出和处理的影响

IF 4.4 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology

Pub Date : 2025-12-17 DOI: 10.1016/j.jconhyd.2025.104818

David M. Singer, Rachel Izworski, Annika Dudik, Allyson C. Tessin

The timeframe for when water quality impairment from acid mine drainage (AMD) from abandoned coal mines might end is often poorly constrained. The response of AMD composition to changes in discharge can provide insight into how mines store and release water and solutes. This work aimed to determine seasonal variability, hydrogeochemical behavior, and metal fluxes from two abandoned coal mines in Appalachian Ohio that represent end-member hydrologic conditions within the Huff Run (HR, groundwater-fed) and Yellow Creek (YC, surface water-fed) watersheds, by: (1) monitoring AMD output to establish seasonal variability; (2) comparing current output to publicly available historical data; and (3) linking metal loadings in the AMD from each mine to characteristics of the coal and abandoned mine works. The HR AMD was dominated by chemostasis (“pipe-full”), whereas the YC AMD was dominated by dilution (“not pipe-full”). For HR, the combination of continuously flooded mineworks recharged primarily by groundwater combined with the presence of fine-grained, diffusely disseminated pyrite in the host rock results in slower AMD production, although shorter timeframe for water quality impairment (decades) given current conditions. In contrast, the faster pace of YC AMD depletion is likely due to the combination of pseudokarstic flow conditions fed by surface water with large, seasonal pulses of dissolved metals from the weathering of coarse-grained aggregates of pyrite but a longer timeframe for AMD impairment to cease (decades to centuries). These results highlight the importance of establishing how the combination of local and regional conditions influence the timeframe for on-going AMD production.

废弃煤矿酸性矿井水（AMD）造成的水质损害何时可能结束的时间框架往往缺乏约束。AMD成分对排放变化的响应可以深入了解矿山如何储存和释放水和溶质。本研究旨在确定俄亥俄州阿巴拉契亚两个废弃煤矿的季节变化、水文地球化学行为和金属通量，这些煤矿代表了Huff Run （HR，地下水）和Yellow Creek （YC，地表水）流域的末端水文条件，方法如下：(1)监测AMD输出以建立季节变化；(2)将当前产出与公开可用的历史数据进行比较；(3)将各矿山矿山中金属的含量与煤炭和废弃矿山的特点联系起来。HR型AMD以化学平衡（“满管”）为主，而YC型AMD以稀释（“不满管”）为主。对于HR来说，持续被水淹没的矿山主要由地下水补给，再加上在宿主岩石中存在细粒、弥散分布的黄铁矿，导致AMD的生产速度较慢，尽管在目前的条件下，水质损害的时间较短（几十年）。相比之下，YC AMD消耗的速度更快可能是由于地表水提供的假岩溶流条件与来自粗粒黄铁矿集合体风化的溶解金属的大量季节性脉冲相结合，但AMD损害停止的时间较长（数十年至数百年）。这些结果突出了确定当地和区域条件如何结合影响正在进行的AMD生产的时间框架的重要性。

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引用次数: 0

Enhancing urban river water quality in Indonesia using mineral wool: Long-term field performance, seasonal dynamics, and multi-index assessment 利用矿棉改善印度尼西亚城市河流水质：长期实地表现、季节动态和多指数评估

IF 4.4 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology

Pub Date : 2025-12-17 DOI: 10.1016/j.jconhyd.2025.104819

Wisnu Prayogo , Prayatni Soewondo , Gerry Andhikaputra , Sarra Rahmadani , Laili Fitria , Zhilli Izzadati Khairuni , I. Made Wahyu Widyarsana , Muammar Qadafi , Novi Fitria , Januar Parlaungan Siregar , Aristya Ardhitama

Urban rivers in rapidly growing tropical cities face persistent pollution pressures and limited wastewater infrastructure, demanding scalable in-stream restoration approaches. This study presents the first long-duration, field-scale deployment of mineral wool (MW) in a tropical monsoon river system, evaluating pollutant attenuation and seasonal treatment dynamics in the Cikapayang River, Bandung, Indonesia. Two MW configurations were installed in cascade channels without pumping, chemical inputs, or hydraulic control, and monitored across wet and dry seasons. Water quality was assessed using 11 physical and chemical parameters and interpreted through four Water Quality Indices (PI, STORET, CCME-WQI, NSF-WQI) to benchmark regulatory and international assessment frameworks. MW achieved mean pollutant removal of 43.51 %, improving river status from heavily polluted to moderate/lightly polluted. Dry-season performance intensified due to longer hydraulic retention and mature biofilms, yielding up to 61.52 % COD and 50.28 % TN removal, while wet-season turbulence reduced residence time but retained stable performance. Microstructural imaging confirmed a transition from mineral-mediated filtration and cation exchange to biofilm-driven nitrification–denitrification. Among WQIs, CCME-WQI exhibited the highest sensitivity, improving from “very poor” to “poor–fair (44.24)”, while PI offered more optimistic classifications. Findings demonstrate MW as an effective, low-energy, circular-material solution for decentralized urban river treatment under monsoon hydrology. This work bridges the gap between controlled experiments and real-river implementation, providing performance and assessment benchmarks for scalable nature-based interventions in developing regions. Future studies should address media longevity, regeneration, and hydrodynamic optimization.

在快速发展的热带城市中，城市河流面临着持续的污染压力和有限的废水基础设施，需要可扩展的河内修复方法。本研究首次在热带季风河流系统中进行了长时间、现场规模的矿棉（MW）部署，评估了印度尼西亚万隆Cikapayang河的污染物衰减和季节性处理动态。两个MW配置安装在梯级通道中，无需泵送、化学输入或液压控制，并在干湿季节进行监测。采用11个物理和化学参数对水质进行评估，并通过四个水质指数（PI， STORET, CCME-WQI, NSF-WQI）进行解释，以基准监管和国际评估框架。MW平均污染物去除率达到43.51%，使河流从重度污染改善到中度/轻度污染。由于水力滞留时间延长和生物膜成熟，旱季性能增强，COD去除率高达61.52%，TN去除率高达50.28%，而雨季湍流减少了停留时间，但性能保持稳定。显微结构成像证实了从矿物介导的过滤和阳离子交换到生物膜驱动的硝化-反硝化的转变。在wqi中，CCME-WQI的敏感性最高，从“非常差”提高到“差-一般”（44.24），而PI的分类更为乐观。研究结果表明，MW是季风水文条件下分散城市河流处理的有效、低能耗、循环材料解决方案。这项工作弥合了对照实验和实际河流实施之间的差距，为发展中地区可扩展的基于自然的干预措施提供了绩效和评估基准。未来的研究应着眼于介质寿命、再生和流体动力学优化。

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引用次数: 0

Adsorption behavior of triclosan by different microplastics and the impact of water chemistry 不同微塑料对三氯生的吸附行为及其对水化学的影响。

IF 4.4 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology

Pub Date : 2025-12-16 DOI: 10.1016/j.jconhyd.2025.104815

Yandan Li , Tianxiang Xia , Dan Zhang , Danyang Zhang , Miao Li

The mechanisms of triclosan (TCS) adsorption onto polyamide (PA), polystyrene (PS), polyvinylchloride (PVC) and low-density polyethylene (LDPE) microplastics (MPs) were investigated, along with the effects of solution pH, ionic strength, and dissolved organic matter (DOM). The Linear model better described TCS adsorption isotherms suggesting that hydrophobic partitioning was the primary mechanism for TCS adsorption, while the Freundlich and Langmuir model fittings showed that TCS adsorption onto MPs was favorable. Following normalization by the specific surface area (SSA) of MPs, adsorption distribution coefficient (K_d) values of 105.70, 0.56, 0.20, and 0.08 L/m² were determined for PA, PS, PVC, and LDPE MPs, respectively. Hydrophobic interaction was the main adsorption mechanism, although other mechanisms, governed by the specific structure and functional groups of the MPs, also contributed. These included the formation of hydrogen bonds between the –OH on TCS (H-bond-donating) and the amide groups on PA (H-bond-accepting), and the π-π interactions between the benzene rings of PS and TCS, and hydrogen bonds between -OH on TCS and –COO^-/–COOH on PVC MPs. TCS adsorption by MPs was found to be pH-dependent, indicating that TCS⁰ was the main species involved in adsorption. The effects of ionic strength on TCS adsorption were not significant and therefore could be ignored. Humic acid (HA) impeded the adsorption of TCS by PA, PS, and LDPE MPs, potentially due to the hydrophobic interactions of HA with the three MPs, the hydrogen bonds with PA MPs, and the π-π interactions with PS MPs, all of which competed with TCS for adsorption sites. Fulvic acid (FA) inhibited TCS adsorption onto PS MPs, as FA could be sorbed by PS MPs through π-π interactions, competing with TCS for adsorption sites. These findings improve the accuracy of risk evaluations for organic pollutants such as TCS when co-occurring with MPs, furthering our understanding of the impacts of complex pollutant mixtures on both human and environmental health.

研究了三氯生（TCS）在聚酰胺（PA）、聚苯乙烯（PS）、聚氯乙烯（PVC）和低密度聚乙烯（LDPE）微塑料（MPs）上的吸附机理，以及溶液pH、离子强度和溶解有机物（DOM）的影响。线性模型较好地描述了TCS的吸附等温线，表明疏水分配是TCS吸附的主要机制，而Freundlich和Langmuir模型拟合表明TCS在MPs上的吸附是有利的。经MPs的比表面积（SSA）归一化后，PA、PS、PVC和LDPE MPs的吸附分布系数（Kd）分别为105.70、0.56、0.20和0.08 L/m2。疏水相互作用是主要的吸附机制，尽管由MPs的特定结构和官能团支配的其他机制也起作用。其中包括TCS上的- oh与PA上的酰胺基团之间形成氢键（供氢键），PS和TCS的苯环之间形成π-π相互作用，以及TCS上的- oh与PVC MPs上的- coo -/- cooh之间形成氢键。发现MPs对TCS的吸附与ph有关，表明TCS0是主要的吸附物质。离子强度对TCS吸附的影响不显著，可以忽略。腐植酸（HA）阻碍了PA、PS和LDPE MPs对TCS的吸附，这可能是由于HA与三种MPs的疏水相互作用、与PA MPs的氢键以及与PS MPs的π-π相互作用，这些相互作用都与TCS争夺吸附位点。富里酸（FA）抑制了TCS在PS MPs上的吸附，因为FA可以通过π-π相互作用被PS MPs吸附，与TCS竞争吸附位点。这些发现提高了有机污染物（如TCS）与MPs共存时风险评估的准确性，进一步加深了我们对复杂污染物混合物对人类和环境健康影响的理解。

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引用次数: 0

Directional injection-driven contaminants transport in groundwater system with asymptotically varying dispersion coefficients 离散系数渐近变化的地下水系统中定向注入驱动的污染物运移

IF 4.4 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology

Pub Date : 2025-12-15 DOI: 10.1016/j.jconhyd.2025.104813

S. Nagouda Smita, R. Iyer Aiswarya

This work examines the effect of asymptotic dispersion for different contaminants, like heavy metals, biological, and radiological types, in heterogeneous groundwater systems. The migration of contaminants within groundwater systems is controlled by advection, dispersion, and sorption phenomena, and these mechanisms are mathematically modeled using the Advection-Dispersion Equation (ADE). Using the Thomas algorithm, a numerical simulation with the Peaceman - Rachford Alternating Direction Implicit (PR-ADI) scheme is applied to solve the ADE under the directional injection boundary (axial input sources). The study on asymptotic dispersion coefficients revealed a broader plume evolution. Non-linear sorption models depended on the saturation limit, and various parameters revealed physically relevant results. The iso-concentration figures depict flow patterns for diverse directional hydrological inflows, supporting stability interpretations. This study introduces a computational approach for modeling contaminant transport in groundwater systems, emphasizing asymptotic field conditions that introduce heterogeneity, coupled with nonlinear sorption effects on the plume morphology. The results highlight how plume morphology responds to variable dispersion and velocity, offering guidance for field-scale aquifer analysis and water quality management. The study is also aligned with Sustainable Development Goal 6 - Clean water and sanitation.

本研究考察了非均质地下水系统中不同污染物（如重金属、生物和放射类型）的渐近分散效应。地下水系统中污染物的迁移受平流、弥散和吸附现象的控制，这些机制使用平流-弥散方程（ADE）进行数学建模。采用Thomas算法，采用Peaceman - Rachford交替方向隐式（r - adi）格式进行数值模拟，求解定向注入边界（轴向输入源）下的ADE。渐近色散系数的研究揭示了更广泛的羽流演化。非线性吸附模型依赖于饱和极限，各种参数揭示了物理相关的结果。等浓度图描绘了不同方向水文流入的流动模式，支持稳定性解释。本研究引入了一种模拟地下水系统中污染物运移的计算方法，强调了引入非均质性的渐近场条件，以及对羽流形态的非线性吸收效应。研究结果突出了羽流形态对不同分散和速度的响应，为现场尺度的含水层分析和水质管理提供了指导。这项研究也符合可持续发展目标6——清洁水和卫生设施。

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引用次数: 0

Spatiotemporal assessment of toxic metals in total suspanded matter and surface sediments of Borçka Reservoir (Türkiye): Tracing pollution and ecological risk implications borka水库（trkiye）总悬浮物和表层沉积物中有毒金属的时空评价：追踪污染和生态风险影响

IF 4.4 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology

Pub Date : 2025-12-15 DOI: 10.1016/j.jconhyd.2025.104814

Koray Özşeker , Yahya Terzi , Coşkun Erüz

This study investigates the spatiotemporal variations of toxic metals (Cu, Pb, Zn, Ni, As) in both suspended particulate matter (SPM) and surface sediments of the Borçka Reservoir (Türkiye) to trace pollution dynamics and evaluate ecological risks. The Borçka Reservoir, located in the southeastern Black Sea basin, is an ecologically and hydrologically important freshwater system affected by intensive human activities. Seasonal sampling was performed at four representative stations throughout 2023. The highest metal enrichment was observed in the upstream region, particularly during autumn, indicating the influence of inflowing waters from the Murgul Stream, a major tributary draining mining areas and discharging into the reservoir. Maximum sediment concentrations reached 446.5 μg/g for Cu, 170.7 μg/g for Pb, and 356.33 μ/kg for Zn, exceeding the Probable Effect Level (PEL; Cu: 197, Pb: 91.3, Zn: 315 μg/g) and Effect Range Median (ERM; Cu: 270, Pb: 218, Zn: 410 μg/g) thresholds of sediment quality guidelines. Enrichment and contamination factors classified Cu as “extremely severe” (class 6), while ecological risk (Er) and toxic risk (TRI) values revealed moderate to considerable risks for Cu and Pb. In SPM, metals also showed autumnal peaks. Physicochemical parameters (pH: 8.17–8.53; TOC: 0.52–0.93%) strongly influenced metal retention. The integrated assessment highlights spatiotemporal heterogeneity of metal pollution and emphasizes the need for continuous monitoring and source-based management strategies for sustainable reservoir ecosystems.

研究了borka水库（trkiye）悬浮颗粒物（SPM）和表层沉积物中有毒金属（Cu、Pb、Zn、Ni、As）的时空变化规律，以追踪污染动态并评价生态风险。borka水库位于黑海盆地东南部，是一个受人类活动强烈影响的重要的生态和水文淡水系统。整个2023年在四个代表性站点进行了季节性采样。在上游地区观察到最高的金属富集，特别是在秋季，这表明来自穆尔古尔河的流入水的影响，穆尔古尔河是一条主要支流，为矿区排水并排入水库。最大沉积物浓度Cu为446.5 μg/g， Pb为170.7 μg/g， Zn为356.33 μ/kg，超过了沉积物质量指南的可能影响水平（PEL; Cu: 197, Pb: 91.3, Zn: 315 μg/g）和影响范围中位数（ERM; Cu: 270, Pb: 218, Zn: 410 μg/g）阈值。富集和污染因子将Cu列为“极严重”（6级），而生态风险（Er）和毒性风险（TRI）值显示Cu和Pb的中度至相当风险。在SPM中，金属也出现了秋季峰值。理化参数（pH: 8.17-8.53; TOC: 0.52-0.93%）强烈影响金属的保留。综合评价强调了金属污染的时空异质性，强调了对可持续水库生态系统进行持续监测和基于源头的管理战略的必要性。

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引用次数: 0

Density-dependent flow, solute transport and mixing in the Fraser River delta aquifer 弗雷泽河三角洲含水层的密度依赖性流动、溶质运输和混合

IF 4.4 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology

Pub Date : 2025-12-15 DOI: 10.1016/j.jconhyd.2025.104816

Yaguang Zhu , Kun Jia , Roger D. Beckie

Groundwater flow in coastal aquifers is influenced by density differences between freshwater and saline water, forming a complex density-dependent flow system. The relatively narrow zone where freshwater and saline water mix is the location of strong geochemical gradients, which can drive reactions. Understanding the dynamics of this mixing zone is crucial to understand the biogeochemical reactions that occur during saline intrusion. In this study, we characterized flow and dispersive mixing in a confined sand aquifer subjected to saline intrusion, using both field observations and numerical modeling. Observations from an extensive monitoring network revealed a saline wedge extending approximately 500 m inland. We simulated density-dependent flow with MIN3P and used PEST++ to estimate dispersivity and diffusion from field observations. In effect, we use salinity data to measure the dispersivity through inverse modeling. The longitudinal and transverse dispersivity were calibrated at 0.1 m and 0.001 m, respectively, while the molecular diffusion coefficient was 1.2 × 10⁻⁹ m²/s. Sensitivity analyses show that transverse dispersivity affects mixing-zone characteristics more than longitudinal dispersivity. Our results highlight the importance of accurately estimating dispersivity values to model the width of the mixing zone, which strongly controls geochemical reactions at the site. These findings provide insights into the processes driving freshwater–saline water mixing in coastal aquifers and offer guidance for future modeling studies on geochemical dynamics during saline intrusion.

沿海含水层的地下水流动受到淡水和咸水密度差的影响，形成了一个复杂的密度依赖流动系统。相对狭窄的淡水和咸水混合带是地球化学梯度强的位置，可以驱动反应。了解这一混合带的动力学对于理解盐水侵入过程中发生的生物地球化学反应至关重要。在这项研究中，我们采用现场观测和数值模拟的方法，对受盐水入侵的承压砂含水层的流动和分散混合进行了表征。来自广泛监测网络的观测显示，一个向内陆延伸约500米的盐楔。我们用MIN3P模拟了密度相关的流动，并使用PEST++从现场观测中估计了分散性和扩散。实际上，我们使用盐度数据通过逆建模来测量分散性。纵向和横向色散分别标定为0.1 m和0.001 m，分子扩散系数为1.2 × 10−9 m2/s。灵敏度分析表明，横向色散比纵向色散对混合区特性的影响更大。我们的研究结果强调了准确估计色散值对模拟混合带宽度的重要性，混合带宽度强烈地控制着现场的地球化学反应。这些发现为了解沿海含水层淡水-咸水混合的过程提供了见解，并为未来盐水入侵过程中地球化学动力学的建模研究提供了指导。

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引用次数: 0

Aggregation kinetics and stability of Ce(IV)-borate colloid: Effect of pH, electrolytes, gibbsite colloid, and humic acid colloid Ce(IV)-硼酸胶体的聚集动力学和稳定性：pH、电解质、三水铝石胶体和腐殖酸胶体的影响

IF 4.4 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology

Pub Date : 2025-12-15 DOI: 10.1016/j.jconhyd.2025.104811

Kang Chen , Rui Zhang , Chunsheng Shi , Shanrong Yuan , Zishuo Li , Daming Zhang , Qiang Jin , Zhijun Guo , Zongyuan Chen

Tetravalent actinides (An(IV)), could be released from high-level radioactive waste (HLW) glass in the form of An(IV)-borate intrinsic colloid. In this study, Ce(IV) was selected as the analogue of An(IV), and the stability of Ce(IV)-borate colloid was studied as a function of pH, electrolytes, gibbsite colloid, and humic acid (HA) colloid by aggregation kinetics experiments. The isoelectric point (pH_IEP) of Ce(IV)-borate colloid was determined to be 7.8, and aggregation of the colloid was increased progressively with the pH approaching this value. The critical coagulation concentrations (CCC) were followed the order that NaCl > KCl > MgCl₂ > NaNO₃ > CaCl₂ > Na₂SO₄. The positively charged gibbsite colloid inhibited the aggregation of Ce(IV)-borate colloid due to enhanced electrostatic repulsion. In contrast, the effect of negatively charged HA on the stability of Ce(IV)-borate colloid was dependent on HA concentration. The presence of low concentrations of HA (0.1–1.0 mg/L) reduced the surface charge of Ce(IV)-borate colloids, resulting in lower CCC, whereas the higher HA concentrations (2.5–25 mg/L) enhanced the colloidal stability of Ce(IV)-borate particles. The Hamaker constant of Ce(IV)-borate colloid was calculated to be 1.29 × 10⁻²⁰ J. The interaction energy calculated with Derjaguin–Landau–Verwey–Overbeek (DLVO) theory and its variants can well describe the changes of colloidal stability. These results provide comprehensive understanding of Ce(IV)-borate colloid properties and offer valuable insights for assessing the fate and transport of An(IV) in real subsurface environments.

四价锕系元素（An(IV)）可以从高放废物（HLW）玻璃中以An(IV)-硼酸盐固有胶体的形式释放。本研究选择Ce（IV）作为An（IV）的类似物，通过聚集动力学实验研究Ce(IV)-硼酸盐胶体的稳定性随pH、电解质、三水石胶体和腐殖酸（HA）胶体的变化规律。测定了Ce(IV)-硼酸酯胶体的等电点（pHIEP）为7.8，随着pH值的接近，胶体的聚集性逐渐增强。临界混凝浓度（CCC）顺序为NaCl >； KCl > MgCl2 > NaNO3 > CaCl2 > Na2SO4。带正电的三水铝石胶体由于静电斥力增强而抑制了Ce(IV)-硼酸钙胶体的聚集。相反，带负电荷的HA对Ce(IV)-硼酸酯胶体稳定性的影响依赖于HA浓度。低浓度的HA （0.1 ~ 1.0 mg/L）降低了Ce(IV)-硼酸酯胶体的表面电荷，导致CCC降低，而高浓度的HA （2.5 ~ 25 mg/L）增强了Ce(IV)-硼酸酯颗粒的胶体稳定性。计算得到Ce(IV)-硼酸盐胶体的Hamaker常数为1.29 × 10−20 j，用Derjaguin-Landau-Verwey-Overbeek （DLVO）理论及其变体计算得到的相互作用能可以很好地描述胶体稳定性的变化。这些结果提供了对Ce(IV)-硼酸盐胶体性质的全面理解，并为评估An（IV）在真实地下环境中的命运和运移提供了有价值的见解。

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引用次数: 0

Adsorption of some hazardous aromatic hydrocarbons by various pristine and heat-activated aged microplastics as potential pollutant carriers in aquatic environment 各种原生和热活化老化微塑料作为潜在污染物载体对水生环境中有害芳烃的吸附研究

IF 4.4 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology

Pub Date : 2025-12-15 DOI: 10.1016/j.jconhyd.2025.104817

Delaram-Sadat Tavoussi-Shirazi , Kamand-Sadat Abdolhosseini , Amir Hossein Hamidian , Habib Bagheri

Microplastics (MPs) are ubiquitous in terrestrial and aquatic ecosystems and persistent micropollutants of concern. Their persistence poses risks to ecosystems, human health, and organisms, while they can facilitate the migration and transformation of persistent organic pollutants by acting as vectors for their transportation into the environment and living organisms. This study examined the adsorption/desorption behavior of three nonpolar polycyclic aromatic hydrocarbons (pyrene, anthracene, and fluorene) on pristine and aged MPs, i.e., polystyrene (PS), polyvinyl chloride (PVC), and polymethyl methacrylate (PMMA) through a series of batch adsorption experiments conducted under different pH values, contact times, and salinities. Results indicate that PS adsorbs higher amounts of PAHs than other MPs due to its rough surface, pores, and aromatic configuration strong π–π interactions. The PAHs adsorption followed a pseudo-second-order model, and fit best with the Freundlich isotherm due to multilayer adsorption. Aging with K₂S₂O₈ for 5 days enhanced adsorption on PMMA through surface roughening, reduced sorption on PVC due to oxidation, while PS exhibited minimal impact. The study examined PAHs desorption from MPs in fasted state simulated gastric fluid (FaSSGF), deionized water, and river water. (FaSSGF) showed the highest desorption rates, with pepsin enhancing desorption through micelle formation and weakening π-π interactions,. These findings highlight how organic pollutants are transported by both pristine and aged microplastics, and demonstrate the risk of desorption of these contaminants in aqueous and gastric environments, which may impact on ecosystems and human health.

微塑料（MPs）在陆地和水生生态系统中普遍存在，是令人关注的持久性微污染物。它们的持续存在对生态系统、人类健康和生物体构成风险，同时它们可以作为持久性有机污染物进入环境和生物体的载体，促进其迁移和转化。本研究通过一系列的间歇吸附实验，考察了三种非极性多环芳烃（芘、蒽和芴）在不同pH值、不同接触时间和不同盐度下对原始和老化MPs（聚苯乙烯（PS）、聚氯乙烯（PVC）和聚甲基丙烯酸甲酯（PMMA））的吸附/解吸行为。结果表明，由于PS表面粗糙、孔隙大、芳香族结构强的π -π相互作用，其吸附多环芳烃的量高于其他MPs。多环芳烃的吸附服从伪二阶模型，多层吸附最符合Freundlich等温线。用K₂S₂O₈时效5天，通过表面粗化增强了对PMMA的吸附，由于氧化减少了对PVC的吸附，而PS的影响最小。该研究检测了禁食状态模拟胃液（FaSSGF）、去离子水和河水中MPs对PAHs的解吸。（FaSSGF）的解吸率最高，胃蛋白酶通过胶束形成和减弱π-π相互作用增强解吸。这些发现强调了有机污染物是如何通过原始和老化的微塑料运输的，并证明了这些污染物在水环境和胃环境中解吸的风险，这可能会影响生态系统和人类健康。

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引用次数: 0

Impact of aging on nanoplastic aggregation and release from low-density polyethylene (LDPE) 老化对低密度聚乙烯（LDPE）纳米塑料聚集和释放的影响

IF 4.4 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology

Pub Date : 2025-12-13 DOI: 10.1016/j.jconhyd.2025.104809

Somayeh Saliminasab, Tao Cheng

The pervasive use of plastics has led to significant environmental pollution, with nanoplastics (NPs) emerging as a critical yet less understood component that poses elevated risks due to high mobility, bioavailability, and toxicity. To address the limitations of using artificial pristine NP proxies, we investigated the aggregation of NPs released from low-density polyethylene (LDPE) using ultraviolet (UV) irradiation and heat treatment. We measured physicochemical property changes, conducted aggregation experiments in various electrolyte solutions, applied DLVO theory, and developed a mathematical model to simulate aggregation kinetics. Our findings reveal that aging processes, particularly heat treatment, significantly promote NP generation from LDPE and alter their physicochemical properties such as surface charge. NP aggregation is notably influenced by aging, pH, and cation valence. Heat-aged NPs exhibited enhanced stability due to more negative surface charges, while UV-aged NPs showed complex aggregation behavior in the presence of Ca²⁺, potentially due to bridging effects. The effect of aging and water chemistry on aggregation in most cases can be explained by the DLVO theory. The simple model we developed effectively simulated the observed aggregation kinetics. These results underscore the critical role of aging in determining NP generation and aggregation dynamics. This study highlights both the applicability and limitations of using artificial NPs as environmental proxies and emphasizes the need for further research on the properties and behavior of real-world, aged nanoplastics to improve predictions of their environmental fate and transport.

塑料的广泛使用导致了严重的环境污染，纳米塑料（NPs）成为一种关键但鲜为人知的成分，由于其高流动性、生物利用度和毒性，其风险增加。为了解决使用人工原始NP代理的局限性，我们使用紫外线（UV）照射和热处理研究了低密度聚乙烯（LDPE）释放的NP的聚集。我们测量了其理化性质的变化，并在不同的电解质溶液中进行了聚集实验，应用DLVO理论，建立了模拟聚集动力学的数学模型。我们的研究结果表明，老化过程，特别是热处理，显著促进了LDPE的NP生成，并改变了它们的物理化学性质，如表面电荷。NP聚集明显受老化、pH和阳离子价的影响。热老化NPs由于更多的表面负电荷而表现出更高的稳定性，而紫外线老化NPs在Ca2+存在下表现出复杂的聚集行为，可能是由于桥接效应。在大多数情况下，老化和水化学对团聚的影响可以用DLVO理论来解释。我们建立的简单模型有效地模拟了观察到的聚集动力学。这些结果强调了衰老在决定NP生成和聚集动力学中的关键作用。本研究强调了使用人工NPs作为环境代理的适用性和局限性，并强调需要进一步研究现实世界中老化纳米塑料的特性和行为，以改进对其环境命运和运输的预测。

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引用次数: 0