环境科学与生态学最新文献

{"title":"Drivers of Ecosystem Metabolism in an Anthropogenically Modified Delta.","authors":"Martin P Volaric, Brian A Bergamaschi, Ariella Chelsky, David B Senn, Stephen G Monismith","doi":"10.1007/s12237-026-01833-z","DOIUrl":"https://doi.org/10.1007/s12237-026-01833-z","url":null,"abstract":"<p><p>Estuaries are under threat globally from a wide range of stressors, with rates of ecosystem metabolism - respiration (R), gross primary production (GPP), and net ecosystem metabolism (NEM) - representing a way for resource managers to quantify their impacts. In this study, we assessed how natural and anthropogenic stressors have altered metabolism within the extensively modified Sacramento-San Joaquin Delta (\"Delta\") in California, USA. Metabolism was estimated using a diel open-water technique utilizing dissolved oxygen measurements from a high frequency (15 min) water quality monitoring array, and spanned 6 sites across 11 years (2014-2025). Our analyses were driven by a conceptual model of Delta carbon (C) cycling focused on 1) Invasive aquatic vegetation (IAV), 2) Phytoplankton, 3) Wastewater treatment plant (WWTP) upgrades, 4) Large-scale flow alterations, and 5) Wet vs. dry years. We found that allochthonous C fuels net heterotrophy in the outer riverine sections of the Delta, while the heavily vegetated central Delta produces autochthonous C remineralized elsewhere in the system. IAV were the dominant primary producers, with low phytoplankton production except during a historic bloom. WWTP upgrades imparted negligible changes to metabolism, with low chlorophyll <i>a</i> (< 5 µg L^-1) both before and after. Introduction of a flow barrier - a management response to drought - hydrodynamically isolated deep-water channels from nearby shallow areas, resulting in decreased metabolism indicative of changes to C transport. Contrary to past research, low rainfall years were associated with increased metabolism. This study demonstrates how multi-sensor arrays can be used to quantify ecosystem responses to major environmental stressors.</p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at https://doi.org/10.1007/s12237-026-01833-z.</p>","PeriodicalId":11921,"journal":{"name":"Estuaries and Coasts","volume":"50 1","pages":"13"},"PeriodicalIF":2.4,"publicationDate":"2027-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13694349/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149264661","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":"Vertical distribution and health risk assessment of SBTEX in urban microenvironments: A comparative study between parking and high-rise buildings areas during haze and non-haze periods.","authors":"Rungruang Janta, Wittaya Tala, Surasak Sichum, K H Sameera M Dharmadasa","doi":"10.1016/j.envpol.2026.129171","DOIUrl":"10.1016/j.envpol.2026.129171","url":null,"abstract":"<p><p>This study investigates the spatiotemporal distribution and health risks of styrene, benzene, toluene, ethylbenzene, and xylenes (SBTEX) in Chiang Mai, Thailand, under haze and non-haze conditions. Air samples were collected at ground level (high-traffic parking area) and rooftop height (30 m) to evaluate the influence of sampling height and source proximity, and seasonal biomass burning. The mean SBTEX concentration was 6.67 ± 3.46 μg m^-3, with toluene (44%) and benzene (18%) as the dominant species. Concentrations were higher at ground level (7.99 ± 4.20 μg m^-3) than at rooftop level (5.35 ± 1.72 μg m^-3), reflecting the combined influence of source proximity and vertical dispersion. During haze, ground-level concentrations increased by up to 2.4-fold, particularly in the morning, driven by atmospheric stability and boundary-layer suppression. Diagnostic ratios and principal component analysis identified vehicular emissions as dominant SBTEX sources, with enhanced photochemical processing and vertical stratification during haze. Elevated m,p-X/E ratios further indicated fresher emissions under reduced atmospheric mixing. Health risk assessments showed that non-carcinogenic risk remained negligible (HI < 0.1) for both students and staff. However, lifetime cancer risk (LCR) exceeded the acceptable threshold (10^-6) for staff at ground level, with benzene as the dominant risk contributor. Sensitivity analysis identified benzene concentration as the influential factor controlling risk variability. These findings highlight the role of vertical pollutant gradients and haze in shaping exposure patterns and health risks, while supporting the need for extended-duration and vertically resolved monitoring to characterize exposure and health risks in Upper Southeast Asia.</p>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":" ","pages":"129171"},"PeriodicalIF":7.2,"publicationDate":"2026-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149029365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"10-year trends of particle size distributions and equivalent black carbon at the Environmental-Climate Observatory (ECO) in Lecce (Italy).","authors":"Daniele Contini, Daniela Cesari, Marianna Conte, Adelaide Dinoi","doi":"10.1016/j.envpol.2026.129234","DOIUrl":"10.1016/j.envpol.2026.129234","url":null,"abstract":"<p><p>This study investigates the long-term (2015-2024) inter-annual and seasonal trends of PM_2.5, coarse particles (PM_10-2.5), particle number size distribution (PNSD, 10-10,000 nm), and equivalent black carbon (eBC) at the ECO Observatory in Lecce (Southern Italy) measured with online instruments. Organic (OC) and elemental (EC) carbon were analysed offline to evaluate the Mass Absorption Cross-section (MAC). Results showed a clear decoupling between fine and coarse mass fractions. PM_2.5 decreased significantly by -2.58% yr^-1, consistent with a reduction of local anthropogenic combustion sources. Conversely, PM_10-2.5 remained stable due to the strong influence of natural Saharan dust events, which impacted 13.2% of the monitored days and induced opposite seasonal patterns between the two size fractions. eBC concentrations exhibited a statistically significant decline of -3.17% yr^-1, consistent with European urban background trends. The mass absorption cross-section remained stable (12.4 ± 2.4 m²g^-1). The reduction of absorption and a stable MAC suggest that the decrease of absorption is due to a decrease of eBC consistent with a decrease of combustion emissions. Seasonally, the eBC/PM₁₀ ratio increases from 2.8% in summer to 4.2% in winter, tracking PM_2.5 variations and highlighting the impact of wintertime emissions and boundary layer dynamics. Total particle number concentration (PNC) decreased by -2.99% yr^-1, primarily driven by reductions in the Aitken and accumulation modes. While submicron particles peaked in winter due to combustion, the coarse mode peaked in summer due to dust. The nucleation mode lacked inter-annual seasonality because summer nucleation countered winter traffic inputs. Diurnal variations were governed by boundary layer dynamics, except for the nucleation mode, which peaked midday due to photochemical new particle formation events happening, on average, in 25% of the days.</p>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":" ","pages":"129234"},"PeriodicalIF":7.2,"publicationDate":"2026-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149035958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Acute co-exposure to urban particulate matter and aircraft noise elicits lung-centered immune-redox proteomic remodeling in mice.","authors":"Corrado Ameli, Bharath Anila Bhuvanendran Nair, Amalie Schufri Klinkby, Marin Kuntic, Matthias Oelze, Ivana Kuntic, Elle Wilson, Omar Hahad, Alex von Kriegsheim, Thomas Münzel, Reka Toth, Andreas Daiber, Petr V Nazarov, Adelina Rogowska-Wrzesinska","doi":"10.1016/j.envpol.2026.129165","DOIUrl":"10.1016/j.envpol.2026.129165","url":null,"abstract":"<p><p>Particulate air pollution and transportation noise frequently co-occur, but their combined molecular effects are poorly defined. We used data-independent acquisition (DIA) LC-MS/MS proteomics to profile lung, brain, and heart from male C57BL/6J mice exposed for 3 days to NIST SRM 1648a urban particulate matter (PM), aircraft noise (NOISE), PM + NOISE, or control conditions. The exposure model is the acute co-exposure paradigm previously characterized with orthogonal functional, redox, and inflammatory endpoints by Kuntic et al. The lung was the dominant responsive organ. PM + NOISE produced the broadest pulmonary response and the strongest induction of immune and macrophage-associated proteins, including acute-phase, particle-handling, interferon-linked, and phagosome-associated markers. This immune signal was accompanied by NADPH oxidase and iron-handling components, altered epithelial barrier markers, and endothelial and extracellular-matrix perturbation. The principal pulmonary modules agreed with orthogonal endpoints previously measured in the parent exposure experiment, including pulmonary NOX-2 and HO-1 protein, in situ reactive oxygen species formation, Cd68 and Mcp-1 transcripts, circulating cytokines, increased systolic blood pressure, impaired endothelium-dependent relaxation of the aorta, and cerebral and retinal arteriolar microvascular dysfunction. Brain and heart responses were lower in amplitude and involved selective redox, neuronal, contractile, metabolic and matrix-associated programs. Observed-versus-expected analyses showed that most stress-responsive proteins scaled proportionally, whereas a smaller set enriched for ribosome, RNA-processing, and chromatin functions was constrained. Integration with transcriptomic data showed strong mRNA-protein concordance in lung and greater transcript-protein divergence in brain and heart. Acute co-exposure therefore increases early pulmonary immune-redox burden without uniform additive escalation across molecular systems.</p>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":" ","pages":"129165"},"PeriodicalIF":7.2,"publicationDate":"2026-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149035992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Temperature shapes a modular division of labor among soil fungi to facilitate antibiotic dissipation.","authors":"Jiawen Yin, Yue Zhang, Wenhai Luo, Yanwen Ma, Ying Sun","doi":"10.1016/j.envpol.2026.129241","DOIUrl":"10.1016/j.envpol.2026.129241","url":null,"abstract":"<p><p>The antibiotics used in veterinary medicine accumulate in agricultural soils, where their persistence selects for antibiotic-resistance genes (ARGs). Soil fungi possess diverse metabolic enzyme systems and substantial potential for antibiotic biodegradation, but how temperature shapes fungal community succession and the functional pathways involved in antibiotic removal remains poorly understood. Herein, soils with histories of no fertilizer and organic fertilizer application (UF and OF, respectively) were spiked with 21 tetracyclines, quinolones and sulfonamides at approximately 2 mg kg^-1 per compound and incubated for 18 months at natural (NT; monthly mean of approximately 15 °C, ranging from -5.6 °C to 28.1 °C), constant (CT, 20 °C), and low (LT, 4 °C) temperatures. Dissipation kinetics were combined with fungal community and metagenomic profiling, co-occurrence networks, and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway-residual correlations. Dissipation was slower in OF (total-antibiotic half-life [DT₅₀] of 22-58 d) than in UF (DT₅₀ of 18-44 d). Temperature exerted a stronger effect, with dissipation fastest at NT (DT₅₀ of 18-22 d) and slowest at LT (DT₅₀ of 44-58 d); ARGs followed the same trend, declining less than the parent compounds and least of all at LT. Temperature restructured the fungal community (PERMANOVA, P ≤ 0.018), chiefly by replacing taxa rather than by nested loss. Fungal-assigned KEGG pathways were inversely correlated with residual antibiotic concentrations (Spearman's ρ = -0.34 to -0.54, P < 0.05) and fell into three candidate functional modules: antibiotic capture and transport, oxidative transformation, and intracellular transformation. Across all temperatures the community retained a capture-and-transport core, for which no significant temperature contrast was detected, whereas oxidative and intracellular transformation were both less abundant at LT. Temperature therefore influences soil antibiotic dissipation by reshaping fungal community structure and redistributing annotated potential among complementary fungal functions. Accounting for this temperature dependence can improve bioremediation strategies for antibiotic-contaminated agricultural soils.</p>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"410 ","pages":"129241"},"PeriodicalIF":7.2,"publicationDate":"2026-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149056800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Passive sampler-based pathway monitoring of melamine-series contaminants and triazine herbicides in an urban tributary.","authors":"Yoonah Jeong, Ye-Eun Lee, Sookhyun Nam, Kibeum Kim","doi":"10.1016/j.envpol.2026.129158","DOIUrl":"10.1016/j.envpol.2026.129158","url":null,"abstract":"<p><p>The environmental occurrence of melamine deamination series and triazine herbicides represents a significant challenge for aquatic monitoring due to their high mobility and persistence. This study investigated cyromazine, melamine, its deamination products, and selected triazine herbicides in an urban tributary using two passive samplers, the Polar Organic Chemical Integrative Sampler (POCIS) and the Chemcatcher. Four 14-day monitoring campaigns were conducted, and passive sampler-derived time-weighted average concentrations were used to evaluate contaminant occurrence, environmental transformation, sampler comparability, and screening-level ecological risk. Melamine and cyromazine were frequently detected, indicating recurrent inputs of parent melamine-series compounds. Ammeline, ammelide, and cyanuric acid were also detected across several site-periods, demonstrating that transformation products can contribute substantially to the total triazine-related burden. Atrazine and cyanazine occurred only during the spring campaign, suggesting episodic herbicide inputs, whereas simazine was detected more persistently at lower concentrations. Molar diagnostic indices indicated that melamine-series dominated the triazine-related burden. POCIS and Chemcatcher yielded comparable detection patterns, although POCIS generally showed higher responses for the highly polar melamine-series compounds. The screening-level mixture risk was governed by atrazine during spring; When atrazine was excluded, the mixture risk quotients remained below 1. Overall, this study supports passive sampler-based pathway monitoring as a useful approach for persistent, mobile, toxic (PMT)-relevant melamine-series contaminants and highlights the need to include intermediate transformation products in water-quality surveillance and screening-level risk assessment.</p>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":" ","pages":"129158"},"PeriodicalIF":7.2,"publicationDate":"2026-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149035966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Anthropogenic microparticles across intertidal, shallow and mesophotic reef sediments in the Southwestern Atlantic.","authors":"Yasmin Barros, Marcelo O Soares, Alejandro P Ayala, Vasco S Neto, Jessica Reichert, Ítalo B Castro, Tommaso Giarrizzo, Rivelino M Cavalcante","doi":"10.1016/j.marpolbul.2026.120302","DOIUrl":"10.1016/j.marpolbul.2026.120302","url":null,"abstract":"<p><p>The distribution of anthropogenic microparticles (AMPs) in reef sediments across different depths and along gradients of estuarine and urban influence remains poorly documented. This study provides baseline information on AMPs in sediments from intertidal (0-2 m), shallow (17-19 m), and mesophotic (30 m) reefs in the Southwestern Atlantic. Concentrations ranged from 73.27 to 1246.45 particles kg^-1 dry weight, with the highest values recorded in intertidal reefs located closest to estuarine inputs. A total of 384 particles were recorded, predominantly fibers, while transparent and blue particles were the most common colors. Raman spectroscopy was used to identify particles, including plastic polymers such as polypropylene and polyethylene terephthalate (PET), as well as non-plastic particles composed of microcrystalline cellulose. Color composition differed among reef sites, with similar patterns observed in intertidal reefs adjacent to urbanized estuaries and in offshore shallow and mesophotic reefs. These findings provide baseline information on the occurrence, characteristics, and spatial distribution of anthropogenic microparticles in reef sediments across a tropical shelf gradient, contributing to a better understanding of microplastic and textile-derived contamination in understudied reef environments.</p>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"233 Pt 2","pages":"120302"},"PeriodicalIF":4.9,"publicationDate":"2026-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148865644","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":"Shipping noise may trigger valve closure responses in exploited scallop beds of the Gulf of St. Lawrence.","authors":"Pierre Poitevin, Florian Aulanier, Frédéric Olivier, Youenn Jézéquel, Antoine Frémont, Laurent Chauvaud, Réjean Tremblay","doi":"10.1016/j.marpolbul.2026.120319","DOIUrl":"10.1016/j.marpolbul.2026.120319","url":null,"abstract":"<p><p>Shipping noise is a pervasive form of underwater noise pollution, yet its effects on benthic invertebrates remain poorly integrated into spatial risk assessments. The Atlantic sea scallop (Placopecten magellanicus), a benthic bivalve supporting the world's largest wild pectinid fishery, detects low-frequency sound (100-500 Hz), overlapping the dominant range of shipping noise. Previous experiments documented life-stage-dependent valve-closure responses, with juveniles showing higher response probabilities than young adults, particularly at 100-150 Hz. We combined commercially exploited scallop-bed distributions, life-cycle information, experimentally derived acoustic dose-response relationships, and probabilistic shipping-noise models to assess the probability that shipping noise may elicit valve closure across scallop habitats in the Gulf of St. Lawrence. Particle-acceleration dose-response relationships were converted into pressure-level response functions compatible with the modeled mean-square sound pressure spectral density level, Lp,f. Their integration generated seasonal response-probability maps at 125 Hz, the modeled frequency located between the experimental frequencies of strongest response. Response probability showed strong spatial and seasonal variability. The highest probabilities occurred near major shipping routes during winter and early spring. Juveniles showed higher response probabilities and broader affected areas than young adults, reaching >30% in some beds during winter months. Several peripheral beds displayed consistently low response probabilities and may function as acoustic refuges. Because these peaks coincide with periods of elevated energetic demand, shipping noise warrants consideration in cumulative-stressor assessments and marine spatial planning. To our knowledge, this is the first spatial mapping of shipping-noise-induced behavioral-response probability for a marine invertebrate. Maps are available through the Ocean Soundscape Atlas.</p>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"233 Pt 2","pages":"120319"},"PeriodicalIF":4.9,"publicationDate":"2026-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148887879","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":"Joint effects of per- and polyfluoroalkyl substances and heavy metals on dyslipidemia: Integrated epidemiological and bioinformatics analysis.","authors":"Yuan-Yuan Fan, Li-Zi Lin, Muhammad Amjad, Yang Zhou, Chu Chu, Zhao-Huan Gui, Wen-Wen Bao, Jing-Wen Huang, Li-Xia Liang, Yun-Ting Zhang, Kun Zhao, Xuan Liu, Yan-Xu Chen, Guang-Hui Dong, Li-Wen Hu","doi":"10.1016/j.envpol.2026.129219","DOIUrl":"10.1016/j.envpol.2026.129219","url":null,"abstract":"<p><p>Exposure to per- and polyfluoroalkyl substances (PFAS) and heavy metals may be associated with dyslipidemia. However, evidence regarding the joint associations and potential interactions of these pollutants remains limited, and the biological pathways that might be relevant to these associations are not yet fully understood. This study, conducted in three communities in Guangzhou, China, involving 1310 participants from 2018 to 2019, investigated the associations between co-exposure to serum PFAS (detection frequency over 85%) and three plasma heavy metals (arsenic (As), lead (Pb), and cadmium (Cd)) with dyslipidemia. Bioinformatic approaches were used to identify candidate biological processes potentially related to these associations. The results showed that individual PFAS, As, and Cd were positively associated with dyslipidemia. Furthermore, the Grouped Weighted Quantile Sum (GWQS) regression model indicated that co-exposure to PFAS and heavy metals was positively associated with dyslipidemia (odds ratio (OR) = 2.19, 95% confidence interval (CI): 1.80, 2.68). A significant additive interaction effect was observed between perfluoro-n-nonaoic acid (PFNA) and Cd for dyslipidemia, with the low-exposure group for both pollutants as reference (relative excess risk due to the interaction (RERI) = 1.21, 95% CI: 0.39, 2.02). A total of 110 overlapping genes associated with PFAS, Cd, and dyslipidemia were identified. KEGG enrichment analyses highlighted PPAR signaling pathway, cholesterol metabolism, insulin resistance, AMPK signaling pathway, and adipocytokine signaling pathway as candidate biological processes shared among PFAS, Cd exposure, and dyslipidemia. Subsequently, six hub genes (PPARA, PPARG, APOB, APOE, INS, and SREBF1) were screened using Cytoscape. These findings provide new insights into the associations between multiple pollutants co-exposure and human health and identify potential biological pathways for future mechanistic investigation.</p>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":" ","pages":"129219"},"PeriodicalIF":7.2,"publicationDate":"2026-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149023465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 impact of the 2021 Tajogaite eruption (La Palma, Canary Islands): Evidence of ²²⁶Ra enrichment in volcanic soils.","authors":"N Miquel-Armengol, A Tejera, C Briones, A C Arriola-Velásquez, H Alonso, J G Rubiano, P Martel","doi":"10.1016/j.envpol.2026.129212","DOIUrl":"10.1016/j.envpol.2026.129212","url":null,"abstract":"<p><p>Volcanic eruptions can redistribute natural radionuclides and modify radiological background levels in inhabited areas. This study assesses the radiological impact of the 2021 Tajogaite eruption on La Palma (Canary Islands, Spain) by characterising eruptive materials, surface soils and terrestrial gamma radiation. Activity concentrations of radionuclides from the ²³⁸U and ²³² Th day series, together with ⁴⁰K and ²³⁵U, were determined in lava, ash, xenopumice and soil samples using gamma and alpha spectrometry. Eruptive products showed ²²⁶Ra enrichment relative to ²³⁰Th within the ²³⁸U decay series. Lava samples had a mean ²²⁶Ra activity concentration of 48 Bq kg^-1 and a mean ²²⁸Ra/²²⁶Ra ratio of 0.67, defining a radiological signature of the eruptive materials. This pattern was also identified in nearby soils, where proximal soils showed higher ²²⁶Ra activity concentrations than northern soils (48.9 vs 23.8 Bq kg^-1, geometric means), while ²²⁸Ra/²²⁶Ra decreased from 1.15 in northern to 0.70 in proximal soils, consistent with the contribution of recent volcanic materials. Terrestrial outdoor gamma absorbed dose rates showed a clear post-eruptive spatial pattern, with the highest values in areas affected by the 2021 eruption. This pattern contrasted with pre-eruptive conditions and showed spatial coherence with the post-eruptive ²²⁶Ra enrichment in proximal soils. Nevertheless, the calculated doses and radiological hazard indices indicated no significant radiological concern for external gamma exposure. These findings support post-eruptive radionuclide monitoring in ocean-island basalt settings.</p>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":" ","pages":"129212"},"PeriodicalIF":7.2,"publicationDate":"2026-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149029383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}