Journal of contaminant hydrology最新文献_第6页

Seasonal behavior of iodine-129 in a contaminated wetland: A field-scale conceptual site model from the Savannah River Site 受污染湿地中碘-129的季节性行为：来自萨凡纳河遗址的现场尺度概念场地模型。

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

Journal of contaminant hydrology

Pub Date : 2025-12-29 DOI: 10.1016/j.jconhyd.2025.104836

Hansell Gonzalez-Raymat , Miles E. Denham , Haruko M. Wainwright , Holly H. VerMeulen , Nathaniel A. Losey , Jeffrey Thibault , Kevin Boerstler , Austin Coleman , Jordan Floyd , Brady D. Lee , Ravi Gudavalli , Carol A. Eddy-Dilek

Wetlands are dynamic ecosystems that can immobilize contaminants for extended periods but can also release them when hydrological and/or biogeochemical conditions change. Although this behavior is well recognized, the field-scale processes controlling the retention and release of certain contaminants such as iodine-129 (¹²⁹I) remain poorly understood, particularly in a contaminated wetland at the U.S. Department of Energy's Savannah River Site. In this study, we hypothesized that seasonal variations in groundwater flux regulate ¹²⁹I behavior by altering the biogeochemistry of the wetland seeps and underlying sediments. To test this hypothesis, we combined soil and water sampling, microbial analysis, iodine speciation, and autonomous sensor monitoring. Our results show that ¹²⁹I is preferentially retained in the organic-rich surface soil, with concentrations peaking at 0.22 Bq g⁻¹ within the upper 0.15 m followed by a decrease with depth. Pronounced seasonal fluctuations in ¹²⁹I concentrations were observed in surface water, increasing from 0.9–2 Bq L⁻¹ in winter to 3–8 Bq L⁻¹ in summer, while groundwater concentrations remained consistently lower (0.2–0.6 Bq L⁻¹) and exhibited minimal seasonal variability. These variations correspond to seasonal changes in groundwater flux towards the seeps: higher flux during winter flushes the seeps causing ¹²⁹I concentrations in surface water to be close to groundwater concentrations, while reduced flux during summer promotes stagnant and anoxic conditions that facilitate the release of bound ¹²⁹I from the organic-rich soil into surface water. Iodine speciation analysis indicates that 78 to 99 % of total iodine in surface water existed as organoiodine, suggesting organic matter degradation drives ¹²⁹I remobilization. These observations were integrated into a field-scale conceptual site model, linking hydrological and biogeochemical processes to the retention and release of ¹²⁹I occurring in the wetlands.

湿地是动态的生态系统，可以长时间固定污染物，但也可以在水文和/或生物地球化学条件发生变化时释放污染物。虽然这种行为已经得到了很好的认识，但控制某些污染物（如碘-129 (129I)）的保留和释放的现场尺度过程仍然知之甚少，特别是在美国能源部萨凡纳河遗址的受污染湿地中。在本研究中，我们假设地下水通量的季节变化通过改变湿地渗漏物和下垫沉积物的生物地球化学来调节129I行为。为了验证这一假设，我们结合了土壤和水采样、微生物分析、碘物种形成和自主传感器监测。结果表明，129I在富有机质的表层土壤中优先保留，浓度在0.15 m以上达到峰值0.22 Bq g-1，随后随深度降低。地表水129I浓度季节性波动明显，冬季为0.9 ~ 2 Bq L-1，夏季为3 ~ 8 Bq L-1，而地下水浓度持续较低（0.2 ~ 0.6 Bq L-1），季节性变化最小。这些变化与地下水流向渗漏层的季节性变化相对应：冬季较高的通量冲刷渗漏层，使地表水中的129I浓度接近地下水浓度，而夏季通量的减少促进了停滞和缺氧条件，促进了结合的129I从富有机质土壤释放到地表水中。碘形态分析表明，地表水中总碘的78 ~ 99%以有机碘的形式存在，表明有机物降解驱动了129I的再活化。这些观测结果被整合到一个野外尺度的概念场地模型中，将水文和生物地球化学过程与湿地中发生的129I的保留和释放联系起来。

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引用次数: 0

Characteristics of tetracycline adsorption by different embedded biochar materials 不同生物炭包埋材料对四环素的吸附特性

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

Journal of contaminant hydrology

Pub Date : 2025-12-29 DOI: 10.1016/j.jconhyd.2025.104833

Chunming Wang, Anqi Zhao , Meng Qi, Yi Jiang

This study explored six novel biochar composite materials for adsorbing tetracycline antibiotics adsorption. These materials—namely, Bauhinia biochar, Bauhinia magnetic biochar, rice straw biochar, rice straw magnetic biochar, rice straw hydrothermal biochar, and rice straw hydrothermal magnetic biochar, were encapsulated with sodium alginate to form adsorption spheres. Results showed that magnetic biochar materials had higher adsorption capacities than non-magnetic ones, with rice straw magnetic biochar adsorption spheres showing the highest capacity at 3 mg/g. The isothermal adsorption of tetracycline by rice straw magnetic biochar adsorption spheres followed the Freundlich model, while the adsorption kinetics were best described by the pseudo-second-order model. The adsorption half-life was 3 h, and factors including biochar dosage, temperature, pH, and salinity affected the removal rate. SEM and FTIR analyses of rice straw hydrothermal magnetic biochar, rice straw magnetic biochar, and rice straw biochar revealed that rice straw biochar materials had a microporous structure mainly composed of C and O, while magnetic materials also contained significant amounts of iron. All three materials contained hydroxyl, alkene, alkyne, and alkyl functional groups. The increased FeO bonds in magnetic materials were the primary reason for the enhanced adsorption performance. Moreover, rice straw magnetic biochar adsorption spheres showed good reusability for high-concentration tetracycline. For low-concentration tetracycline, the adsorption capacity recovery exceeded 60 %, achieving an overall removal rate of over 80 %. Owing to their excellent recyclability and rapid adsorption rates, the rice straw magnetic biochar adsorption spheres hold significant potential in advanced wastewater treatment containing tetracycline antibiotics.

本研究探索了六种新型吸附四环素类抗生素的生物炭复合材料。将紫荆花生物炭、紫荆花磁性生物炭、稻秆生物炭、稻秆磁性生物炭、稻秆水热生物炭、稻秆水热磁性生物炭等材料包被海藻酸钠形成吸附球。结果表明，磁性生物炭材料的吸附能力高于非磁性材料，其中稻草磁性生物炭吸附球在3 mg/g时的吸附能力最高。稻秆磁性生物炭吸附球对四环素的等温吸附符合Freundlich模型，而吸附动力学最适合用拟二阶模型描述。吸附半衰期为3 h，生物炭投加量、温度、pH、盐度等因素影响去除率。对秸秆水热磁性生物炭、秸秆磁性生物炭和秸秆生物炭的SEM和FTIR分析表明，秸秆生物炭材料具有以C和O为主的微孔结构，磁性材料中还含有大量的铁。这三种材料都含有羟基、烯烃、炔和烷基官能团。磁性材料中FeO键的增加是吸附性能增强的主要原因。此外，秸秆磁性生物炭吸附球对高浓度四环素具有良好的可重复使用性。对于低浓度四环素，吸附容量回收率超过60%，总体去除率达到80%以上。稻秆磁性生物炭吸附球具有良好的可回收性和快速的吸附速率，在含四环素类抗生素废水的深度处理中具有很大的潜力。

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引用次数: 0

Quantitative profile, sources and health implications of polychlorinated biphenyls (PCBs) in the strategic Otin River water, Nigeria 尼日利亚战略奥廷河水中多氯联苯的数量概况、来源和健康影响。

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

Journal of contaminant hydrology

Pub Date : 2025-12-26 DOI: 10.1016/j.jconhyd.2025.104826

Adebanjo Jacob Anifowose, Mariam Abolore Muritala, Aaliyah Omotayo Bello, Abosede Susannah Oguntolu, Kazeem Abiodun Ibrahim, Shola Hezekiah Awojide

Otin River is one of the longest strategic rivers in Osun State (Nigeria) with diverse economic values: commercial fishing, community water supply, farming and domestic activities. Nineteen toxic polychlorinated biphenyls (PCBs) were studied in the river water to understand their contamination levels, sources and potential health threats to humans. The river water samples were collected from six locations. The PCBs were extracted by liquid-liquid extraction and quantified using a gas chromatograph-mass spectrometer (GC–MS). All the PCBs were detected in the river water, ranging from 0.002 μg/L (PCB206) to 0.96 μg/L (PCB180). Using the average concentration of the individual PCB measured, their total concentration was 2.96 μg/L, which exceeded the standard permissible limit of 0.5 μg/L for drinking water. This indicated a high level of contamination. The six dominant congeners in the river water were in the following order: PCB180 > PCB170 > PCB44 > PCB5 > PCB187 > PCB18 (0.12 μg/L). The total PCB concentration at the river midstream housing the Eko-Ende Dam was significantly higher (P < 0.05) than that measured at the upstream and downstream. Using principal component analysis, the PCB sources were profiled as the dam's hydraulic system, plastics, paints and farm's agrochemical runoffs. Of the 19 PCBs, PCB5, PCB44, PCB170 and PCB180 posed both non-carcinogenic and carcinogenic risks to human health. PCB170 and PCB180 posed the highest risks via ingestion. Some residents/farmers usually consume the water. Thus, the PCB concentrations could cause unimaginable health risks to the people and aquatic life, necessitating effective management strategies.

奥廷河是奥孙州（尼日利亚）最长的战略河流之一，具有多种经济价值：商业捕鱼、社区供水、农业和家庭活动。对河水中的19种有毒多氯联苯进行了研究，以了解它们的污染水平、来源和对人类的潜在健康威胁。河水样本是从六个地点采集的。采用液液萃取法提取多氯联苯，气相色谱-质谱联用仪（GC-MS）定量。河水中检测到的多氯联苯含量在0.002 μg/L (PCB206) ~ 0.96 μg/L （PCB180）之间。按测得的单个多氯联苯平均浓度计算，其总浓度为2.96 μg/L，超过了饮用水标准允许浓度0.5 μg/L。这表明污染程度很高。6个优势同系物在河水中的分布顺序为：PCB180 > PCB170 > PCB44 > PCB5 > PCB187 > PCB18 （0.12 μg/L）。Eko-Ende大坝所在的中游多氯联苯总浓度显著升高(P

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引用次数: 0

Characterizing seawater intrusion and groundwater vulnerability to salinization along the east coast of India 印度东海岸海水入侵和地下水易受盐碱化影响的特征。

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

Journal of contaminant hydrology

Pub Date : 2025-12-26 DOI: 10.1016/j.jconhyd.2025.104829

Biplab Sarkar , Aznarul Islam , Amit Kumar , Swapan Talukdar , Md Nawaj Sarif , Akanksha Pandey , Kaustubh Lahiri , Sutapa Mukherjee , Abdur Rahman , SK. Mafizul Haque , Abujar Rahaman

The groundwater resource in the coastal aquifers is highly vulnerable to seawater intrusion and salinization, triggered by multiple physical and anthropogenic factors. Therefore, the present study aims to address this pressing issue in the eastern coastal region of India based on 10 hydrochemical parameters of 1228 groundwater samples coupled with 15 lithologs, and annual groundwater draft for irrigation, industry, and domestic data for 37 coastal districts of the study area. The results reveal that 39.09 % of the samples are recorded as saline by the hydrochemical facies evolution diagram, while 55.09 % of the samples exhibit SMI >1, indicating the widespread presence of seawater intrusion into coastal aquifers. The region-specific study of SMI reveals that 91 out of 134 samples (67.91 %) are identified as SMI > 1 in West Bengal while the corresponding proportions are 63.61 % for Tamil Nadu, 56.10 % for Andhra Pradesh, and 32.49 % for Odisha. The study has also revealed hotspots for SMI, and the coastal regions of Odisha, Andhra Pradesh, and Tamil Nadu are found with significant hotspots for groundwater salinization. The fine sand and silt layers of the aquifers play a conducive role for the presence of saline water through direct seepage from the sea. Moreover, the excessive groundwater draft (0–7.94 × 10⁸ m³) for irrigation, (0–1.878 × 10⁷ m³) for industrial, and (0–2.029 × 10⁸ m³) for domestic uses shifts the hydraulic gradient landward, leading to the movement of saline water to the coastal aquifers.

沿海含水层地下水资源极易受到海水入侵和盐渍化的影响，受到多种物理和人为因素的影响。因此，本研究旨在根据研究区37个沿海地区1228个地下水样品的10个水化学参数以及15个岩性，以及灌溉、工业和生活用水的年地下水用量数据，解决印度东部沿海地区这一紧迫问题。结果表明，39.09%的样品水化学相演化图记录为咸化，55.09%的样品显示SMI >1，表明海水侵入沿海含水层的现象普遍存在。SMI的区域特异性研究显示，西孟加拉邦134个样本中有91个（67.91%）被确定为SMI >1，而泰米尔纳德邦的相应比例为63.61%，安得拉邦为56.10%，奥里萨邦为32.49%。该研究还揭示了SMI的热点地区，奥里萨邦、安得拉邦和泰米尔纳德邦的沿海地区被发现具有地下水盐渍化的显著热点。含水层的细沙和粉砂层对海水直接渗透的咸水起到了有利的作用。此外，过量的灌溉地下水（0-7.94 × 108 m3）、工业地下水（0-1.878 × 107 m3）和生活地下水（0-2.029 × 108 m3）使水力梯度向陆地移动，导致咸水向沿海含水层移动。

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引用次数: 0

Development and application evaluation of baseflow separation/pollution load estimation tool considering the characteristics of the recession by flow condition-specific 考虑特定流态衰退特性的基流分离/污染负荷估算工具的开发与应用评价。

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

Journal of contaminant hydrology

Pub Date : 2025-12-26 DOI: 10.1016/j.jconhyd.2025.104832

Yeonji Jeong , Jeongho Han , Seoro Lee , Sangjoon Bak , Gwanjae Lee , Jonggun Kim , Kyoung Jae Lim

This study introduces the WAPLE4 system, developed to accurately separate direct runoff and baseflow and calculate pollution loads while considering the recession characteristics of hydrographs under varying flow condition-specific. The system was applied to four major watersheds in South Korea, demonstrating improved accuracy in baseflow separation, with an average baseflow reduction of 7 % when the β parameter by flow condition-specific was applied. Furthermore, pollution load analysis revealed reductions in TP and TN loads by 10.92 % and 10.56 %, underscoring the effectiveness of this parameter in refining pollution load estimates. These findings highlight the system's ability to improve flow condition-specific baseflow and pollutant load calculations while reflecting the distinct characteristics of individual watersheds. By enabling precise quantification of pollutant loads from both direct runoff and baseflow, this system can be effectively utilized to provide foundational data for the development of more comprehensive watershed management strategies and aid decision-makers in addressing water quality challenges more effectively.

本研究引入了WAPLE4系统，该系统能够准确地分离直接径流和基流，并计算污染负荷，同时考虑了不同流量条件下水文曲线的衰退特征。该系统应用于韩国的四个主要流域，显示了基流分离的准确性，当应用特定流量条件的β参数时，平均基流减少了7%。此外，污染负荷分析显示，总磷和总氮负荷分别减少了10.92%和10.56%，强调了该参数在改进污染负荷估算中的有效性。这些发现突出了该系统在反映单个流域的独特特征的同时，能够改善特定流量条件的基流和污染物负荷计算。通过对直接径流和基流的污染物负荷进行精确量化，该系统可以有效地为制定更全面的流域管理战略提供基础数据，并帮助决策者更有效地应对水质挑战。

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引用次数: 0

Characteristics of polycyclic aromatic hydrocarbons along an urban river in snowmelt and non-snowmelt periods from Northeast China 东北城市河流融雪期和非融雪期多环芳烃特征

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

Journal of contaminant hydrology

Pub Date : 2025-12-24 DOI: 10.1016/j.jconhyd.2025.104828

TeRi GeLe , Kaijun Lu , Zucheng Wang , Shasha Liu , Ziping Liu

The polycyclic aromatic hydrocarbons (PAH) concentrations along an urban river from Northeast China were investigated during snowmelt and non-snowmelt periods. The results showed that the concentration of dissolved PAHs in the samples collected during the snowmelt period ranged from 61 to 271 ng L⁻¹, significantly lower than those in the non-snowmelt period, which ranged from 141 to 833 ng L⁻¹ (p < 0.05). The highest PAH concentrations in river were generally observed at municipal sewage treatment outlet. PAH concentrations were positively correlated with SUVA₂₅₄ value (p < 0.01) and negatively correlated with dissolved organic carbon (DOC), total nitrogen (TN), and total phosphorus (TP) (p < 0.01). PAH concentration increased from the upstream suburbs to urban areas, and downstream suburbs in snowmelt period, whereas an opposite trend was observed during non-snowmelt periods. These findings indicate that different factors control PAH concentration distribution along the urban river during two periods. However, despite the spatial distribution pattern of PAHs along the upstream-downstream gradient changing due to snowmelt, the overall PAH levels during snowmelt were not higher than those observed in the non-snowmelt period. This study implies that snowmelt may not always rapidly increase PAH concentrations in aquatic environment, especially in urban rivers.

对东北某城市河流在融雪期和非融雪期的多环芳烃（PAH）浓度进行了研究。结果表明：融雪期样品中溶解多环芳烃的浓度为61 ~ 271 ng L-1，显著低于非融雪期样品的141 ~ 833 ng L-1 （p 254值）

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引用次数: 0

Explainable advanced modelling of interfacial tension in H2 – CO2 – CH4 – brine systems for sustainable subsurface storage in saline aquifer 可解释的H2 - CO2 - CH4 -盐水系统界面张力的先进模型，用于盐酸盐含水层的可持续地下储存。

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

Journal of contaminant hydrology

Pub Date : 2025-12-24 DOI: 10.1016/j.jconhyd.2025.104827

Saad Alatefi , Okorie Ekwe Agwu , Menad Nait Amar , Ahmad Alkouh

Hydrogen is increasingly recognized as a pillar of future low-carbon energy systems, offering flexibility across multiple sectors and contributing to deep decarbonization goals. To enable large-scale deployment, Underground Hydrogen Storage (UHS) in geological formations such as saline aquifers is gaining considerable attention as a strategic option for ensuring secure and scalable energy reserves. The safety, efficiency, and operational success of UHS heavily depend on accurately determining interfacial tension (IFT) between hydrogen/cushion gas and the in-situ brine, as this parameter governs several critical phenomena related to storage performance. This study aims to develop a reliable and explainable machine learning framework to predict IFT in H₂/cushion gas–brine systems across diverse thermodynamic and compositional conditions. Two input schemes were explored: the first included nine variables covering detailed salt composition, pressure, temperature, and the presence of cushion gas (represented by average critical temperature, T_cm); the second used a simplified set of four inputs, namely equivalent salinity, pressure, temperature, and T_cm. A curated database of approximately 500 experimentally measured IFT data points was employed to train and validate three models: radial basis function neural network (RBFNN), generalized regression neural network (GRNN), and categorical boosting (CatBoost). Among these, the CatBoost-based model under the simplified scheme achieved the highest predictive accuracy (R² = 0.9979, RMSE = 0.5136 mN/m), with excellent physical consistency and generalization. Trend analysis confirmed the model's ability to replicate expected IFT behavior under varying conditions. Comparative benchmarking showed that the CatBoost model outperformed several state-of-the-art models from the literature. A leverage-based applicability domain analysis revealed that 97 % of the data points fall within acceptable influence and residual bounds, confirming robustness. Beyond accuracy, the model is highly interpretable globally and locally using SHAP and LIME techniques, making it suitable for real-time deployment in UHS operations to support safe injection design and long-term storage reliability.

氢越来越被认为是未来低碳能源系统的支柱，它为多个部门提供了灵活性，并有助于实现深度脱碳目标。为了实现大规模部署，地下储氢（UHS）作为一种确保安全和可扩展的能源储备的战略选择，在咸水含水层等地质构造中得到了相当大的关注。UHS的安全性、效率和操作成功在很大程度上取决于氢气/缓冲气体与原位盐水之间的界面张力（IFT）的准确测定，因为该参数控制着与储存性能相关的几个关键现象。本研究旨在开发一种可靠且可解释的机器学习框架，以预测不同热力学和成分条件下H2/缓冲气-盐水系统中的IFT。研究人员探索了两种输入方案：第一种包括9个变量，包括详细的盐成分、压力、温度和缓冲气体的存在（用平均临界温度Tcm表示）；第二种使用了一组简化的四个输入，即等效盐度、压力、温度和Tcm。一个由大约500个实验测量的IFT数据点组成的数据库被用来训练和验证三种模型：径向基函数神经网络（RBFNN）、广义回归神经网络（GRNN）和分类增强（CatBoost）。其中，简化方案下基于catboost的模型预测精度最高（R2 = 0.9979, RMSE = 0.5136 mN/m），具有良好的物理一致性和泛化性。趋势分析证实了该模型在不同条件下复制预期IFT行为的能力。比较基准测试表明，CatBoost模型优于文献中的几个最先进的模型。基于杠杆的适用性域分析显示，97%的数据点落在可接受的影响和残差范围内，证实了鲁棒性。除了准确性之外，该模型在全球和本地都具有高度的可解释性，使用SHAP和LIME技术，使其适合于UHS作业的实时部署，以支持安全注入设计和长期存储可靠性。

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引用次数: 0

Spatio-temporal dynamics and flux of microplastics in the lower Ganges-Brahmaputra-Meghna River system and estuary 恒河-雅鲁藏布江-梅克纳河下游水系及河口微塑料的时空动态与通量

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

Journal of contaminant hydrology

Pub Date : 2025-12-24 DOI: 10.1016/j.jconhyd.2025.104830

Md. Jaker Hossain , Sheikh Aftab Uddin , Lijun He , Huahong Shi , Jing Zhang

Rivers are major pathways of land-based plastic debris to the oceans, but limited data exist for microplastic (MP) flux from large river systems. This study examines the spatial and seasonal dynamics of MPs in the Ganges-Brahmaputra-Meghna (GBM) River system and estuary, a key contributor to global marine plastic pollution. MP abundances ranged from 1.53 to 8.13 items/L in the dry season and 2.67 to 7.67 items/L in the wet season, with no significant overall seasonal difference (p > 0.05). The dominated shape and color were fiber and blue, respectively, with the size class of 0.02–0.5 mm being predominant. The prevalent polymers during both seasons were rayon and polyethylene. MP transported into the Bay of Bengal (BoB) were calculated as 9.42 × 10¹² items/day (1.17 tons/day) during dry season and 33.95 × 10¹² items/day (10.78 tons/day) in wet season indicating that a substantial amount of MPs are being input to marine environment from GBM River system compared with other rivers globally. Risk assessments indicated high contamination levels (CF, PLI, and HI) and substantial ecological risks (RI) values in the entire study area with maximum pollution level gradient at the Ganges, Meghna and GBM confluence. These findings contribute important quantitative information on spatio-temporal patterns and load of MP, necessary for validation of global-level MP flux models and the development of focused mitigation strategies within the GBM basin.

河流是陆地塑料垃圾进入海洋的主要途径，但关于大型河流系统的微塑料通量的数据有限。本研究考察了恒河-布拉马普特拉河-梅克纳河（GBM）水系和河口中MPs的空间和季节动态，这是全球海洋塑料污染的主要原因。MP丰度在旱季为1.53 ~ 8.13项/L，在雨季为2.67 ~ 7.67项/L，总体季节性差异不显著（p < 0.05）。以纤维型和蓝色为主，尺寸等级为0.02 ~ 0.5 mm。这两个季节流行的聚合物是人造丝和聚乙烯。经计算，进入孟加拉湾（BoB）的MPs在旱季为9.42 × 1012项/天（1.17吨/天），在雨季为33.95 × 1012项/天（10.78吨/天），表明与全球其他河流相比，从GBM河系统输入到海洋环境的MPs数量相当大。风险评估显示，整个研究区域的污染水平（CF、PLI和HI）较高，生态风险（RI）值较大，污染水平梯度最大的是恒河、梅克纳河和GBM汇合处。这些发现提供了重要的时空格局和大气颗粒物负荷的定量信息，对于验证全球大气颗粒物通量模型和在GBM盆地内制定重点缓解战略是必要的。

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引用次数: 0

Bioconversion of heavy metals in river sediments: Seasonal dynamics, driving mechanisms, and BSAF-based assessment in the Liujiang River basin 柳江流域河流沉积物中重金属的生物转化：季节动态、驱动机制及基于bsaf的评价

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

Journal of contaminant hydrology

Pub Date : 2025-12-24 DOI: 10.1016/j.jconhyd.2025.104821

Yupei Hao , Xueqin Wei , Tianyao Yang , Xiongyi Miao , Gaohai Xu , Sheping Yang , Xiaohua Zhou

The bioconversion of heavy metals (HMs) in sediments has received limited research attention, despite its critical importance for ecological risk assessment. The Liujiang River Basin, a typical karst catchment in Southwest China, provides an ideal context for investigating HM bioconversion due to the generally high bioavailability of HMs in its sediments. This study employed the Biotic Sediment Accumulation Factor (BSAF) to analyze spatio-temporal variations in the bioconversion of seven priority metals between sediments and wild fish. Results demonstrated that BSAF values for most HMs were significantly higher in the wet season than in the dry season. Zinc demonstrated the highest bioaccumulation potential, with its BSAF frequently exceeding 1 and reaching up to 1.99, unlike the other studied HMs. A clear correspondence was observed between BSAF values and oxidizable fractions, suggesting the crucial role of oxidizable forms in driving HM bioconversion. Multivariate correlation analysis further revealed that combined proportions of oxidizable and carbonate-bound fractions shaped three distinct bioconversion patterns: inhibited bioconversion under dual low fractions (resulting in low BSAFs), promoted bioconversion with a single high fraction, and significantly promoted bioconversion under dual high fractions (producing high BSAFs). Notably, seasonal variations in BSAF values between Pseudohemiculter dispar and Cyprinus carpio indicated that pelagic feeding amplifies the impact of exogenous HMs, while benthic feeding intensifies the influence of sediment-destabilized HMs. Given the dominant roles of carbonate-bound and oxidizable fractions, we recommend implementing strict wastewater emission controls coupled with enhanced dissolved oxygen levels in water bodies to effectively mitigate HM bioconversion in sediments.

沉积物中重金属的生物转化对生态风险评价具有重要意义，但其研究却很少。柳江流域是中国西南地区典型的喀斯特流域，其沉积物中有机质的生物利用度普遍较高，为研究有机质的生物转化提供了理想的环境。本研究采用生物沉积因子（BSAF）分析了7种优先金属在沉积物与野生鱼类之间生物转化的时空变化。结果表明，大多数hm的BSAF值在雨季显著高于旱季。锌表现出最高的生物蓄积潜力，其BSAF经常超过1，最高可达1.99。在BSAF值和可氧化组分之间观察到明显的对应关系，表明可氧化形式在驱动HM生物转化中的关键作用。多元相关分析进一步表明，氧化组分和碳酸盐结合组分的组合比例形成了三种不同的生物转化模式：双低组分下的生物转化受到抑制（导致低BSAFs），单高组分下的生物转化得到促进，双高组分下的生物转化得到显著促进（产生高BSAFs）。值得注意的是，pseudohemulter dispar和Cyprinus carpio之间BSAF值的季节变化表明，远洋摄食放大了外源HMs的影响，而底栖摄食则加剧了沉积物不稳定HMs的影响。鉴于碳酸盐结合和可氧化组分的主导作用，我们建议实施严格的废水排放控制，同时提高水体中的溶解氧水平，以有效减轻沉积物中的HM生物转化。

{"title":"Bioconversion of heavy metals in river sediments: Seasonal dynamics, driving mechanisms, and BSAF-based assessment in the Liujiang River basin","authors":"Yupei Hao , Xueqin Wei , Tianyao Yang , Xiongyi Miao , Gaohai Xu , Sheping Yang , Xiaohua Zhou","doi":"10.1016/j.jconhyd.2025.104821","DOIUrl":"10.1016/j.jconhyd.2025.104821","url":null,"abstract":"<div><div>The bioconversion of heavy metals (HMs) in sediments has received limited research attention, despite its critical importance for ecological risk assessment. The Liujiang River Basin, a typical karst catchment in Southwest China, provides an ideal context for investigating HM bioconversion due to the generally high bioavailability of HMs in its sediments. This study employed the Biotic Sediment Accumulation Factor (BSAF) to analyze spatio-temporal variations in the bioconversion of seven priority metals between sediments and wild fish. Results demonstrated that BSAF values for most HMs were significantly higher in the wet season than in the dry season. Zinc demonstrated the highest bioaccumulation potential, with its BSAF frequently exceeding 1 and reaching up to 1.99, unlike the other studied HMs. A clear correspondence was observed between BSAF values and oxidizable fractions, suggesting the crucial role of oxidizable forms in driving HM bioconversion. Multivariate correlation analysis further revealed that combined proportions of oxidizable and carbonate-bound fractions shaped three distinct bioconversion patterns: inhibited bioconversion under dual low fractions (resulting in low BSAFs), promoted bioconversion with a single high fraction, and significantly promoted bioconversion under dual high fractions (producing high BSAFs). Notably, seasonal variations in BSAF values between <em>Pseudohemiculter dispar</em> and <em>Cyprinus carpio</em> indicated that pelagic feeding amplifies the impact of exogenous HMs, while benthic feeding intensifies the influence of sediment-destabilized HMs. Given the dominant roles of carbonate-bound and oxidizable fractions, we recommend implementing strict wastewater emission controls coupled with enhanced dissolved oxygen levels in water bodies to effectively mitigate HM bioconversion in sediments.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"277 ","pages":"Article 104821"},"PeriodicalIF":4.4,"publicationDate":"2025-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837531","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}

引用次数: 0

Comparative analysis of column experiments highlights the suitability and challenges of using common plant-based viruses as surrogates for human adenovirus in saturated porous media 柱状实验的对比分析强调了在饱和多孔介质中使用常见植物基病毒作为人类腺病毒替代品的适用性和挑战

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

Journal of contaminant hydrology

Pub Date : 2025-12-23 DOI: 10.1016/j.jconhyd.2025.104831

Emmanuel Cobbinah , Subhash C. Verma , Krishna Pagilla , Rishi Parashar

Understanding virus transport in porous media is crucial for assessing the risks associated with viral contamination in subsurface environments. Plant and human viruses may enter water systems through agricultural runoff, wastewater discharge, or other pathways, necessitating a detailed investigation of their mobility and persistence. This study investigates the transport behavior of Tomato Brown Rugose Fruit Virus (ToBRFV), Pepper Mild Mottle Virus (PMMoV), and human adenovirus (HAdV) in porous media using controlled laboratory column experiments packed with uniform size glass beads. Breakthrough curves generated were analyzed using an advection-dispersion-reaction equation to model each virus's transport dynamics. The two plant-based viruses, ToBRFV and PMMoV, exhibited similar transport profiles with sharp breakthrough onsets and pronounced tailing, whereas HAdV showed a more gradual breakthrough, indicating distinct transport dynamics. The differences in transport were largely attributed to the morphological differences between plant viruses and human adenovirus. Additionally, variations in influent water chemistry, particularly pH, appear to significantly influence virus transport by modifying the DLVO interaction energy between viral particles and glass bead surfaces. While no direct one-to-one correlation was observed between the transport of HAdV and the plant viruses, statistical analysis revealed ToBRFV as a more reliable surrogate compared to PMMoV. By elucidating key factors influencing viral transport, this study provides insights that could inform risk assessments and mitigation strategies for waterborne viral contamination. These findings highlight the potential role of viral morphology and water chemistry in identifying reliable viral surrogates for subsurface transport assessments.

了解病毒在多孔介质中的转运对于评估地下环境中病毒污染的相关风险至关重要。植物和人类病毒可能通过农业径流、废水排放或其他途径进入水系统，因此需要对其流动性和持久性进行详细调查。本研究利用均匀尺寸玻璃微珠填充的可控柱实验，研究了番茄褐果病毒（ToBRFV）、辣椒轻度斑驳病毒（PMMoV）和人腺病毒（HAdV）在多孔介质中的转运行为。利用平流-分散-反应方程对生成的突破曲线进行分析，以模拟每种病毒的运输动力学。两种基于植物的病毒ToBRFV和PMMoV表现出相似的转运特征，均有明显的突破开始和明显的尾迹，而hav则表现出更缓慢的突破，表明不同的转运动力学。植物病毒和人类腺病毒在运输上的差异主要归因于形态上的差异。此外，进水化学的变化，特别是pH值的变化，似乎通过改变病毒颗粒和玻璃珠表面之间的DLVO相互作用能，显著影响病毒的转运。虽然hav的转运与植物病毒之间没有直接的一对一的相关性，但统计分析显示，与PMMoV相比，ToBRFV是更可靠的替代品。通过阐明影响病毒转运的关键因素，本研究为水传播病毒污染的风险评估和缓解策略提供了见解。这些发现强调了病毒形态和水化学在确定可靠的病毒替代品以评估地下运输方面的潜在作用。

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引用次数: 0