Environmental Geochemistry and Health最新文献

{"title":"Field evaluation of liquid fraction of digestates from different feedstocks on soil properties, water productivity, maize yield and economic performance.","authors":"Gamze Depel, Zeynep Demir, Derya Özalp Ünal, Ayten Namlı, Nihal Ceren Alıcı, Özgür Doğan","doi":"10.1007/s10653-026-03528-7","DOIUrl":"https://doi.org/10.1007/s10653-026-03528-7","url":null,"abstract":"<p><p>The sustainable management of livestock and plant residues is a key challenge in modern agriculture, and the recycling of organic wastes through liquid fraction of digestates (LDs) represents a promising solution within a circular bioeconomy framework. As the reuse of organic waste in agriculture gains rapid importance within the scope of circular bioeconomy, field studies that simultaneously assess the hygienic safety, organic pollutants, and pesticide residues of biogas sludge alongside its effects on water use, yield, kernel quality, soil chemistry/enzymology, and economic performance remain limited. This study evaluated the effects of LDs obtained from three different feedstocks (digestate A: poultry+poppy plant residues; digestate B: cattle+plant residues; digestate C: poultry+cattle residues) applied at doses of 10, 30, 50 and 70 t ha⁻<sup>1</sup> (fresh matter basis) on yield and yield components, kernel quality, soil health, water productivity and economic performance on sustainable maize production under field conditions during the 2022-2023 growing season. The results showed that LDs significantly increased maize grain yield, thousand kernel weights, cob weight, and kernel yield per cob, whereas cob diameter, cob length, harvest index, crude protein, and plant height were not significantly affected. In the soil, LDs significantly increased electrical conductivity (EC), available P<sub>2</sub>O<sub>5</sub>, K<sub>2</sub>O, Ca, Mg, Fe, Mn, and B, as well as cation exchange capacity, microbial biomass carbon, microbial respiration, urease activity, and phosphatase activity, thereby improving nutrient availability and soil biological functioning. Furthermore, kernel nutrient composition was improved, with significant increases in total N, P, K, Ca, Mn, Zn, and B contents, while total Mg, Fe, Cu, and Cr remained unaffected. Water productivity (WP) and irrigation water productivity (IWP) showed numerical variation among treatments, with the highest values observed under digestate C; however, these differences were not statistically significant. Although Salmonella spp., Listeria monocytogenes, and E. coli O157 were not detected, elevated Clostridium spp. counts indicated a potential microbiological risk, emphasizing the need for appropriate hygienization prior to agricultural use. Additionally, certain pesticide residues (e.g., permethrin) and high EC in digestate A highlight the importance of dose optimization and monitoring. Although no significant increases in exchangeable Na or potentially toxic metals were observed during the two-year field experiment, the long-term environmental fate of pesticide residues and trace metals remains uncertain, indicating that repeated LDs require continuous monitoring to ensure environmental and food safety. Overall, the findings demonstrate that LDs can be an effective organic amendment for sustainable maize production, enhancing crop productivity, soil health, and resource efficiency while supporti","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149180247","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":"Deciphering spatio-temporal variation of groundwater recharge patterns in the large irrigation district.","authors":"Nuan Yang, Shen Qu, Ao Gao, Jigang Shi, Zengbao Zhang, Ping Miao, Ruihong Yu","doi":"10.1007/s10653-026-03526-9","DOIUrl":"https://doi.org/10.1007/s10653-026-03526-9","url":null,"abstract":"<p><p>Global warming and human activities have an inconvenient impact on groundwater systems, frequent agricultural irrigation may alter the groundwater recharge and circulation. However, research on the spatio-temporal variations of groundwater recharge patterns in large irrigation districts remains insufficient. Focusing on the Yellow River South Bank Irrigation District in Inner Mongolia, this study analyzed the hydrochemical and stable isotopic compositions of canal water, river water, and groundwater during April, July and November to explored the spatio-temporal evolution of groundwater recharge pattern. The δ²H and δ¹⁸O analysis indicates that the main recharge sources of groundwater are lateral runoff, canal water, and river water. The spatial variation of isotopic compositions in three water bodies along the flow path exhibit seasonal variation. The primary recharge from upstream to downstream changes from lateral runoff (> 50%) to canal infiltration (> 50%), with a most contribution of river infiltration (> 40%) in the midstream in April (spring). Groundwater recharge is dominated by lateral runoff and river infiltration in July (summer), which is affected by precipitation (> 40%) in the downstream. Canal infiltration (> 35%) and lateral runoff (> 35%) mainly replenishes groundwater in November (autumn). Reverse hydrogeochemical modeling further validated the groundwater recharge sources. Groundwater hydrochemistry is predominantly governed by multiple mineral dissolution/precipitation, while also being influenced by seasonal variations in recharge sources. This study provides important insights for protecting vulnerable riverbank agricultural groundwater systems.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149163782","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":"Biochar-mediated immobilization of aged napropamide in soil: reduced bioavailability and underlying sequestration mechanisms.","authors":"Jiaxing Yu, Zhenxiang Guo, Jing Yang, Wanping Zhang, Jiaohong Li, Xiaomao Wu","doi":"10.1007/s10653-026-03537-6","DOIUrl":"https://doi.org/10.1007/s10653-026-03537-6","url":null,"abstract":"<p><p>Biochar has emerged as a promising material for immobilizing organic contaminants in agricultural soils. This study investigated how different biochars influence the adsorption, distribution, and bioavailability of aged napropamide during 112 d of aging in sterilized typical farmland soils across China. Aging significantly enhanced napropamide adsorption, with adsorption coefficients increasing by 4-16-fold compared to freshly spiked pesticide. This enhancement was further amplified when red soil was amended with three types of biochar (0.1-1%, w/w), particularly coconut shell-derived biochar (CSC), which demonstrated superior performance. Biochar addition substantially reduced the dissolved fraction of napropamide while promoting the formation of non-extractable residues through various interaction mechanisms. The residual napropamide content in 1% CSC-treated soil remained remarkably low (0.46-1.34%) compared to 0.1% CSC treatment (2.15-5.32%). Mechanistic studies revealed that while bamboo-derived and tobacco stem-derived biochars involved both physical and chemical interactions with aged napropamide, CSC functioned predominantly through physical sequestration. Most importantly, CSC amendment substantially reduced the bioavailability of aged napropamide, as evidenced by over 85% reduction in Capsicum annuum uptake, minimal accumulation in Eisenia fetida tissues (0.05 mg/kg), and significantly decreased degradation residues by Bacillus cereus LGY06 (0.70 mg/kg). These comprehensive findings provide crucial insights into how biochar modifies the environmental behavior and reduces the ecological risk of aged pesticides in soil systems, offering valuable guidance for developing effective soil remediation strategies.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149165167","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":"Geogenic controls and anthropogenic inputs on the seasonal hydrogeochemical variability of the Paraopeba River basin, Brazil.","authors":"Normara Yane Mar da Costa Andrade, Gabriel Soares de Almeida, Lúcio Cardoso de Medeiros Filho, Roberto Dall'Agnol, Prafulla Kumar Sahoo, Lucas Pereira Leão, Fernando Verassani Laureano, Vitor Brognaro Pimenta, Gabriel Negreiros Salomão","doi":"10.1007/s10653-026-03466-4","DOIUrl":"10.1007/s10653-026-03466-4","url":null,"abstract":"<p><p>This study investigates the combined effects of geology, land use and land cover, hydrological seasonality, and disturbance history on the hydrogeochemistry of surface waters in the Paraopeba River Basin (PRB), located in Minas Gerais State, southeastern Brazil, and forming part of the São Francisco River Basin, a region characterized by high lithological complexity and intense anthropogenic pressure. A total of 264 sites were sampled during the dry season (2022) and 262 during the rainy season (2023), allowing an integrated assessment of spatial and temporal variability. Hydrochemical facies are predominantly mixed bicarbonate, with water chemistry mainly controlled by silicate weathering. Localized deviations toward Na, Cl and SO₄^2- enriched compositions are observed in urban and industrialized areas, reflecting anthropogenic contributions that are more pronounced during the dry season. In the confluence of the Paraopeba River with the Maranhão River it is observed a major hydrogeochemical control, resulting increased concentrations of Mn, Ba, SO₄^2-, Cl^-, NO₃^-, and P downstream in the Paraopeba River, with persistent influence even under seasonal dilution conditions. The effects of the tailings related to the reservoir failure in Brumadinho, a municipality in central Minas Gerais, were evaluated; however, the analyzed dataset does not show a consistent downstream geochemical signature attributable to tailings remobilization. Current variability is predominantly controlled by diffuse and point-source inputs associated with land use. Geochemical reference values for Al, Fe, Mn, Ni, Ba, and Sr were established using the mMAD, TIF, and UTL methods within four integrated geospatial classes. The UTL method showed greater consistency in defining thresholds, approximating upper percentiles (P95-P98) or maximum values. Seasonal effects are more pronounced for Fe and Al, whereas Mn shows greater mobility in the dissolved phase. Overall, hydrogeochemical variability is primarily controlled by geology, modulated by hydrological seasonality, and intensified by anthropogenic pressure.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13658292/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149165371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Source apportionment and source-oriented health risk assessment of heavy metal(loid)s in soils of Zibo City, a typical industrial City in China: insights from APCS-MLR and Monte Carlo simulation.","authors":"Tong Chang, Cheng Peng, Tao Wang, Sha Zhu, Yi He, Chenjie Wang","doi":"10.1007/s10653-026-03527-8","DOIUrl":"https://doi.org/10.1007/s10653-026-03527-8","url":null,"abstract":"<p><p>Soil heavy metal(loid) pollution in industrial cities has become an increasingly concerning issue worldwide. The contamination status, source and health risk of Cr, Ni, Cu, Zn, As, Cd, Pb and Hg in the soils of Zibo city, a typical industrial city of China, were investigated. Results demonstrated that 2.33%, 1.16%, and 0.75% of samples exceeded the thresholds for Cu, Zn, and Cd, respectively. Cu, Zn, and Hg exhibited moderate pollution, and 1.50% of the sampling sites were classified as heavily polluted. According to the Influence Index of Comprehensive Quality (IICQ), the soil-vegetable systems in some plots of Zhangdian, Boshan, and Zichuan districts were classified as heavily contaminated. The heavily polluted areas were mainly concentrated in the central region. Source apportionment using the absolute principal component scores-multiple linear regression (APCS-MLR) model suggested that Zn, Cd, and Pb were mainly associated with industrial emissions and traffic, Cr and Ni with natural parent material, As and Hg with agricultural activities and atmospheric deposition, and Cu with multiple sources. Monte Carlo simulation-based health risk assessment indicated that soil heavy metal(loid)s posed a tolerable risk to local residents, with As and Ni being the main contributors to local health risks. Source-oriented health risk assessment further suggested that agricultural activities and atmospheric deposition were the priority pollution sources, and arsenic should be the target heavy metal(loid) for prioritized soil management. These findings could provide technical support and scientific reference for investigating soil heavy metal(loid) pollution and safeguarding public health in industrial cities.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149165612","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":"Mechanism of lactic acid bacterial fertiliser on enhancing growth and selenium absorption of rapeseed revealed by transcriptome analysis and rhizosphere bacterial diversity.","authors":"Fengjiao Li, Yiming Zhang, Juli Sun, Guanglong Wu, Jingwen Guo, Haifeng Li, Xifeng Wang, Jianhang Qu","doi":"10.1007/s10653-026-03529-6","DOIUrl":"https://doi.org/10.1007/s10653-026-03529-6","url":null,"abstract":"<p><p>There is a widespread phenomenon of insufficient selenium (Se) intake globally. While Se-enriched bacterial fertilisers have shown potential for biofortification, their integrated effects on plant physiological responses, antioxidant defense, rhizosphere bacterial community assembly, and leaf transcriptomic regulation remain poorly understood. A pot experiment was conducted with three treatments: control (CK), Se fertiliser without bacterial inoculation (S), and Se-enriched bacterial LB-2 fertiliser (L). Plant growth parameters, antioxidant enzyme activities (SOD, CAT, POD), organic Se conversion rate, rhizosphere soil bacterial community (16S rRNA gene sequencing), and leaf transcriptome were analyzed. Compared with the S treatment, the L treatment significantly increased plant height, fresh weight, soluble sugar content, and achieved a higher organic Se conversion rate (79.26%). Antioxidant enzyme activities in rapeseed leaves under the L treatment were more effective in reducing oxidative stress induced by exogenous Na₂SeO₃ than those in the S treatment. Rhizosphere soil bacterial diversity analysis revealed that the L treatment significantly enriched beneficial rhizosphere taxa, including Sphingomonas, Paraflavitalea, and Neorhizobium, which may enhance soil fertility and plant growth. Transcriptome sequencing of rapeseed leaves showed significant alterations in the expression of key genes involved in secondary metabolic pathways, including P5CS2, NCED4, and ZEP.The Se-enriched bacterial LB-2 fertiliser developed in this study offers a potential solution to alleviate Se deficiency by enhancing organic Se conversion, improving antioxidant capacity, modulating rhizosphere bacterial communities, and regulating leaf secondary metabolism, thereby providing a viable strategy for increasing Se levels in food crops.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149165298","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":"Chicken manure and cow manure regulate phytoremediation of cadmium-contaminated alkaline soils through distinct mechanisms.","authors":"Luqi Mi, Xu Qin, Qingqing Huang, Lijie Zhao, Yuebing Sun","doi":"10.1007/s10653-026-03519-8","DOIUrl":"https://doi.org/10.1007/s10653-026-03519-8","url":null,"abstract":"<p><p>Phytoremediation can completely remove harmful heavy metals from soil; however, it is limited by low efficiency and long cycling times. In this study, to further improve the efficiency of phytoremediation of alkaline cadmium (Cd)-contaminated soils, we investigated the enhanced Cd uptake capacity of Tagetes patula L. through manure application and explored its underlying mechanisms. The results indicate that chicken manure significantly increased soil available Cd through pH reduction, thereby enhancing Cd enrichment in T. patula. In contrast, cow manure did not alter soil pH or available Cd. However, it substantially promoted plant biomass, leading to increased total Cd uptake primarily via a biomass-amplification mechanism. Both manures improved plant physiological status and altered root metabolomic profiles, upregulating Cd-related defense pathways. They also enriched beneficial soil microbial taxa (e.g. Bacteroidota and Patescibacteria) and enhanced soil enzyme activity. Overall, livestock manures can enhance phytoremediation of Cd-contaminated alkaline soils but via distinct mechanisms: chicken manure acts through Cd mobilization and direct uptake, whereas cow manure relies on growth promotion and improved plant tolerance. These findings provide a theoretical basis and application value for optimizing manure-assisted phytoremediation strategies: chicken manure is suitable for short-term Cd removal scenarios, while cow manure is better suited for long-term soil remediation combined with sustainable agricultural practices.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149134731","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":"Radiological assessment and heavy metal variability in Red Sea coastal sediments using integrated geochemical and geophysical techniques.","authors":"Turki Kh Faraj, Rehab A Seif, Waheed H Mohamed, Sherif A Taalab, Hashem A Madkour, Mayeen Uddin Khandaker, Atef El-Taher, Mohamed Y Hanfi","doi":"10.1007/s10653-026-03480-6","DOIUrl":"https://doi.org/10.1007/s10653-026-03480-6","url":null,"abstract":"<p><p>This study aims to conduct an integrated assessment of radionuclides (²³⁸U, ²³²Th, and ⁴⁰ K), potentially toxic elements (including Pb, Cd, Zn, Cu, Rb, Br, Co and Ni), and geochemical composition (metals) in coastal sediments of the Red Sea. In addition, geophysical datasets (including Bouguer gravity) were integrated with statistical approaches. PCA (Principal Component Analysis) is a multivariate statistical method applied to the measured geochemical and radiological datasets to explore potential sources of metals and radioactive isotopes, as well as to find correlations and patterns. The analysis and interpretation of Bouguer, regional (deep), and residual (shallow) anomalies highlight the NW-SE direction as the primary structural influence in the region. In contrast, the E-W and NE-SW directions played lesser roles in affecting the structural situation. This detailed examination of gravity anomalies provides crucial insights into the subsurface structures, aiding in the comprehensive understanding of the area's geology. Twenty-six coastal sediment samples were analyzed using high-resolution gamma-ray spectrometry and ICP-MS for radionuclides, major oxides, and metals. Basic geophysical data (density contrast) supported the interpretation of spatial variability. Radiological hazard indices were calculated to evaluate exposure risks. The specific activity concentration of ²³⁸U, ²³²Th and ⁴⁰ K in sediments from the coast were measured to range between 5 - 38 Bq kg^-1, 0-13 Bq kg^-1 and 22 - 501 Bq kg^-1 respectively; all of these values are lower than worldwide average values. The radiological hazard indices, including radium equivalent activity (Ra_eq) ranges from 31 - 82 Bq kg^-1, which is much lower than the safety limit of 370 Bq kg^-1. Both the external (Hex) and internal hazard indices (Hin) are <1, which indicates that there is a minimal radiological risk. The absorbed dose rate (15-40 nGy h^-1) and the annual effective dose (0.04-0.06 mSv y^-1) are both significantly lower than the worldwide values. Therefore, all hazard indices demonstrate that the sediments have no significant radiological hazard to the public. Heavy metal abundance followed the order Sr > Ba > Cr > Br > V > Zr > Zn > Ni > Rb > Cu > Co > Pb > U > Th. All radiological indices indicated safe levels, although localized variations warrant continued environmental monitoring, specify which parameters were elevated. The study confirms that natural radioactivity in the Red Sea is generally low, but exhibits some variation in relation to lithological and mineral compositions.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149147564","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":"Geopolymer fungal cell integration achieved through passive immobilization: a new sustainable candidate to effectively remove toxic lead contamination.","authors":"Tamer Akar, Fatih Sayin, Sibel Tunali Akar, Ilknur Kara, Sema Celik, Halime Çınar, Gülşah Özen, Ferhat Kara","doi":"10.1007/s10653-026-03515-y","DOIUrl":"https://doi.org/10.1007/s10653-026-03515-y","url":null,"abstract":"<p><p>The novel hybrid sorbent (JEONS5), developed with Neurospora cells immobilized on a geopolymer support, is proposed for the removal of toxic Pb²⁺ ions. The investigation focused on  sorbent characterization and the potential sorbent-pollutant interactions utilizing zeta potential measurements, infrared spectroscopy (FTIR), scanning electron microscopy (SEM) combined with Energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray fluorescence (XRF), and X-ray photoelectron spectroscopy (XPS). During the sorption process, the joint activity of the geopolymer and Neurospora cells was noted. The groups -OH, -NH, C=O, C-N, Si-O, and Al-O were found to have the potential to be efficient. For effective Pb²⁺ uptake (> 95%) in batch mode, the optimal pH and JEONS5 dosage were determined to be 5.0 and 0.04 g, respectively, using a metal ion concentration of 100 mg L^-1. The uptake was very rapid and independent of temperature; equilibrium was reached in approximately 30 min, with more than 75% of the total uptake occurring within the first 5 min. The Langmuir model proved more suitable for the equilibrium data with a q_max of 1.05×10^-3 mol g^-1 (217.56 mg g^-1), even if the pseudo-second-order kinetic model fitted the sorption kinetics well. Breakthrough and exhaustion points were noted at 20 and 350 min. The JEONS5 column's breakthrough curve is fairly well fitted by Chu's simplistic model. Regeneration tests have shown that JEONS5 exhibited sorption and desorption efficiencies exceeding 90% in the first ten cycles, and even at the end of the 20th cycle, it could still demonstrate 50% sorption efficiency. Mechanistic studies indicate that the Pb²⁺ sorption process proceeds via several concurrent pathways, including surface complexation, ion exchange, and electrostatic interactions. Our findings argue that JEONS5 has enormous potential for treating toxic Pb²⁺-contaminated aquatic systems.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149134657","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":"Bentonite seepage-control layers mitigate the transport of antibiotics and antibiotic resistance genes during reclaimed water infiltration.","authors":"Zhenghui Zhang, Ziwei Chen, Xiaohe Jiang, Yu Han, Han Zheng, Xiao Zhao, En Xie, Yunkai Li","doi":"10.1007/s10653-026-03522-z","DOIUrl":"https://doi.org/10.1007/s10653-026-03522-z","url":null,"abstract":"<p><p>Reclaimed water reuse is crucial for alleviating water scarcity, yet poses risks of disseminating antibiotics and antibiotic resistance genes (ARGs) into river-groundwater systems. Although clay minerals and bentonite are known to adsorb extracellular DNA, the performance of a bentonite seepage-control layer (SCL) in simultaneously controlling intracellular ARGs (iARGs) and extracellular ARGs (eARGs) during reclaimed-water infiltration has not been systematically evaluated. We employed large-scale (3 m) soil column simulators to investigate bentonite SCL interception performance during a 40-day reclaimed-water infiltration experiment. By integrating hydraulic characterization with chemical analysis using high-performance liquid chromatography (HPLC) and molecular analyses using quantitative real-time polymerase chain reaction (qPCR) and 16S rRNA sequencing, we quantified the transport, retention, and microbial ecological responses. Results showed the bentonite SCL acted as a robust physicochemical barrier, enhancing the apparent attenuation of antibiotics by 48.51% and reducing ARG migration. The bentonite SCL reduced antibiotic and ARG transport through the coupled effects of hydraulic retardation and sorptive retention. Independent adsorption experiments further demonstrated that bentonite had a substantially higher capacity for retaining plasmid DNA than native soil, while eARGs remained the dominant ARG fraction in both column systems (p < 0.001). Furthermore, the SCL achieved ARG interception without causing significant ecological disturbance: microbial α-diversity was preserved and the indigenous community structure remained stable. These findings demonstrate that bentonite SCLs provide a robust, cost-effective, and passive strategy for mitigating emerging biological contaminant transport, offering a practical pathway for reducing the ecological risks associated with reclaimed water reuse.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149126709","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}