环境科学与生态学最新文献

{"title":"Lignosulfonate-derived sulfur functionalization of bimetallic Ni/Co-MOF for effective removal of Hg(II) from wastewater.","authors":"Yu Zhou, Fan Zheng, Mingzhu Dai, Gangyi Sun, Dayu Tian, Bowen Guo, Huiping Bai, Xiangjun Yang, Li Li, Shixiong Wang","doi":"10.1016/j.envres.2026.125949","DOIUrl":"https://doi.org/10.1016/j.envres.2026.125949","url":null,"abstract":"<p><p>The high toxicity and persistence of mercury (Hg(II)) severely threaten the safety of aquatic environments. In this study, a strategy based on sodium lignosulfonate (Na-LS) functionalized Ni/Co-MOF was proposed, successfully constructing a series of sulfur-doped lignin-MOF composite adsorbents (LS-Ni/Co-MOF). The introduction of Na-LS enabled efficient sulfur doping, which significantly enhanced the Hg(II) adsorption performance of the resulting composites. Batch adsorption experiments at 298 K showed that the Langmuir model calculated the maximum Hg(II) adsorption capacity of 0.5-LS-Ni/Co-MOF, 0.75-LS-Ni/Co-MOF, and 1-LS-Ni/Co-MOF to be 781.7, 799.7, and 802.1 mg g^-1, respectively, with equilibrium attained within 60 min at an initial concentration of 100 mg L^-1. Furthermore, LS-Ni/Co-MOF exhibited highly selective adsorption toward Hg(II) over various competing ions, including Ca(II), Al(III), Pb(II), Cd(II), Mg(II), Co(II), Ni(II), Zn(II), and Mn(II). The K_d values for Hg(II) reached 349237.3, 450760.9 and 471704.5 L g^-1 for 0.5-LS-Ni/Co-MOF, 0.75-LS-Ni/Co-MOF, and 1-LS-Ni/Co-MOF, respectively. After five consecutive adsorption-desorption cycles, the Hg(II) removal efficiency remained above 70%. Dynamic column tests showed a 50% breakthrough time of 3120 min, demonstrating great potential for practical application. In real wastewater, the materials achieved a removal efficiency of 90% for Hg(II). Finally, Spectroscopic analysis and DFT calculations revealed that the adsorption mechanism involves a coordination interaction between the surface hydroxyl and sulfonate groups and Hg(II). This work provides a promising materials design pathway for the functional utilization of lignin and the purification of heavy metal-contaminated wastewater.</p>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":" ","pages":"125949"},"PeriodicalIF":8.2,"publicationDate":"2026-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149214846","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":"Oxytetracycline adsorption by clay-carbon hybrids: effects of pH, commercial formulation additives, and PET microplastics.","authors":"María Emilia Zelaya-Soulé, María Luciana Montes, María Emilia Villanueva, Mariela Alejandra Fernández","doi":"10.1007/s11356-026-38315-5","DOIUrl":"https://doi.org/10.1007/s11356-026-38315-5","url":null,"abstract":"<p><p>The removal of antibiotics from water under environmentally complex laboratory systems remains insufficiently understood, particularly in the presence of coexisting contaminants such as formulation additives and microplastics. This study evaluates the performance of clay-carbon hybrid materials for the removal of oxytetracycline from aqueous solutions under both controlled and complex conditions. Natural montmorillonite and two montmorillonite-carbon hybrids were investigated through batch adsorption experiments, including kinetic and equilibrium analyses at different pH values. One of these (MDac3-210-500) exhibited a high adsorption capacity at neutral pH, reaching a maximum value of ~ 0.6 mmol/g. Mechanistic analysis suggests that chemisorption plays a key role in montmorillonite, whereas intraparticle diffusion and surface heterogeneity appear to dominate in the hybrids. To approximate realistic scenarios, adsorption experiments were conducted using a veterinary commercial oxytetracycline formulation and in the presence of polyethylene terephthalate (PET) microplastics (particles < 112 μm at 0.5 g/L). The commercial formulation led to a marked decrease in adsorption capacity for hybrids (0.05-0.08 mmol/g), highlighting matrix effects and competition for active sites, whereas, under the tested experimental conditions, PET microplastics did not substantially modify oxytetracycline adsorption by the hybrid materials. These findings highlight the sensitivity of oxytetracycline adsorption to coexisting compounds and provide a basis for understanding the performance of clay-carbon hybrids under more complex water treatment conditions. In particular, the contrasting effects of formulation additives and PET microplastics emphasize the importance of considering matrix composition when evaluating adsorbent performance.</p>","PeriodicalId":545,"journal":{"name":"Environmental Science and Pollution Research","volume":" ","pages":""},"PeriodicalIF":5.8,"publicationDate":"2026-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149214859","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":"First Results from a Passive Air Monitoring Network across Five East African Countries for Polycyclic Aromatic Hydrocarbons (PAHs)and Metals.","authors":"Egide Kalisa, Tom Harner, Franck Kwabe, Amandeep Saini, Jacob Mastin","doi":"10.1016/j.envpol.2026.129361","DOIUrl":"https://doi.org/10.1016/j.envpol.2026.129361","url":null,"abstract":"<p><p>Air pollution in sub-Saharan Africa remains poorly characterized, particularly for chemically resolved organic and metal pollutants. We measured 23 polycyclic aromatic hydrocarbons (PAHs) and 24 trace metals (acid-digested fractions for total metals present and water-soluble fractions) at 10 sites across five East African countries using polyurethane foam passive air samplers (PUF-PASs), with dry-season sampling at all sites and paired wet-season sampling at four. The 30-day integrated dry-season samples revealed spatial heterogeneity in both pollutant concentrations and compositions. PAH profiles varied markedly among sites in the relative contributions of 2-to 6-ring compounds, and water-soluble metals generally accounted for only a small fraction of total metal concentrations. Enrichment factors distinguished crustal-associated elements from relatively enriched ones. Source characterization, combining PAH diagnostic ratios, the HYSPLIT trajectory model, Spearman correlation, and principal component analysis (PCA), indicated mixed, overlapping source influences rather than single-source signatures. Over 90% of air masses at all sites arrived from the south and south-east, and neighbouring cross-border sites received nearly identical air, indicating that local rather than long-range sources drove the concentration differences. In the compound-level PCA, the first two components explained 46.5% and 19.9% of the total variance, and several PAHs and metals shared similar spatial co-loading patterns. PAH and metal concentrations were generally lower in the wet season at four paired sites. Screening-level health-risk estimates varied widely across sites: metal-associated risk dominated at some high-metal sites, while PAH-associated risk was highest at Bukavu. These estimates represent screening scenarios, not measured lifetime risks. This study demonstrates the feasibility of effectively addressing critical monitoring gaps by using PUF-PASs, which are simple, electricity-free passive samplers for characterizing complex pollutant mixtures in data-sparse East African settings and provide time-integrated samples over weeks/months. The study provides an initial regional reference dataset to inform expanded long-term monitoring and air-quality management.</p>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":" ","pages":"129361"},"PeriodicalIF":7.2,"publicationDate":"2026-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149214924","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":"Spatial distribution characteristics and source analysis of heavy metals in river sediments in Western Hainan Island, China","authors":"Jiaqing Li,&nbsp;Shuwen Sun,&nbsp;Yanqing Wang,&nbsp;Fuqiang Wang,&nbsp;Jinli Wang,&nbsp;Xiaoqi Chen","doi":"10.1007/s10661-026-16058-7","DOIUrl":"10.1007/s10661-026-16058-7","url":null,"abstract":"<div><p>The spatial distribution and sources of heavy metals in river sediments can effectively reflect watershed geochemical processes. Hainan Island, the only tropical island province in China, is located in the country’s southern region, with eight major rivers in its western region chosen as the study area. A total of 67 surface sediment samples were collected to analyze six heavy metals (Cr, Cd, Pb, Zn, Cu, Ni). Contamination levels, ecological risks, and source contributions were assessed using the contamination factor (CF), geo-accumulation index (<i>I</i>_geo), potential ecological risk index (RI), and APCS-MLR model. The average metal concentrations followed the order: Zn (41.05 mg/kg) &gt; Pb (30.93 mg/kg) &gt; Cr (17.89 mg/kg) &gt; Cu (8.23 mg/kg) &gt; Ni (5.45 mg/kg) &gt; Cd (0.08 mg/kg), with CV values ranging from 41.3% to 181.5%. The study area presented an overall low ecological risk. Pb (mean CF = 1.21) and Cd (mean CF = 1.08) exhibited moderate contamination. Cr, Zn, Cu, and Ni showed no contamination (CF &lt; 1). The mean RI value was 39.70, indicating low overall ecological risk. APCS-MLR results identified three pollution sources: the dominant natural-agricultural-traffic composite source (64.0%), mainly controlling Cd, Pb, and Zn enrichment; the industrial source (13.3%), primarily affecting Cr, Ni, and Cu; and the mixed source (22.7%), representing multi-source superposition. This study clarifies the pollution characteristics and key sources of heavy metals in western Hainan Island river sediments, providing theoretical support for regional pollution management and watershed ecological restoration.</p></div>","PeriodicalId":544,"journal":{"name":"Environmental Monitoring and Assessment","volume":"198 11","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Design of experiment for optimization of adsorptive removal of galantamine onto the thermally reduced graphene oxide nanosheet (rGONS)","authors":"Shanku Denrah","doi":"10.1002/ep.70438","DOIUrl":"https://doi.org/10.1002/ep.70438","url":null,"abstract":"<p>The drugs appeared as emerging contaminants in aquatic environment needs proper treatment to safeguard the ecosystem. The present report deals with synthesis of reduced graphene oxide nanosheet (rGONS) from graphite powder by modification of Hummer's method and subsequent thermal treatment and has been tested for the potential removal of Galantamine (Alzheimer's drug). The immobilization of the drug on the adsorbent was confirmed from characterization of the material done by UV–Vis, FTIR, Raman spectroscopy, XRD, SEM, FESEM, TEM and EDS analysis before and after the adsorption of drug. Adsorption was dependent on the operational variables viz. adsorbent dose, initial concentration of drug, contact time, temperature and pH. The interactive influence of the variables was investigated following response surface methodology (RSM) with built up a mathematical model and mapped in design space by response surface and contour plots. The percentage contribution of the variables to the response is found to be temperature (D: 33.13%) &gt; initial concentration (B: 32.88%) &gt; adsorbent dose (A: 16.11%) &gt; contact time (C: 1.38%) &gt; pH (E: 0.22%) obtained from FFD study. The optimized adsorption condition is: adsorbent dose: 10 mg, initial concentration: 40 mg L⁻¹, temperature: 313 K obtained from CCD. The rGONS-drug adsorption process follows a pseudo second-order rate law, Langmuir isotherm and is thermodynamically feasible (−Δ<i>G</i>₀ = 11.35 kJ mol⁻¹). The higher specific surface area, abundant sorption sites, one pot synthesis, short equilibrium time (30 min), high adsorption capacity (81.96 mg g⁻¹), regeneration capacity, and reusability properties makes it a promising nano adsorbent for water remediation.</p>","PeriodicalId":11701,"journal":{"name":"Environmental Progress & Sustainable Energy","volume":"45 5","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149205971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Simultaneous adsorption/photo catalytic degradation of turquoise blue dye by silk fibroin—TiO2-based bio-composite under visible light irradiation","authors":"P. Supriya Prasad,&nbsp;K. Manikandan,&nbsp;D. Ommurugadhasan,&nbsp;M. ArulMurugan,&nbsp;J. Jayaprabakar,&nbsp;R. Arunadevi,&nbsp;P. N. Sudha,&nbsp;M. Deepa","doi":"10.1002/ep.70429","DOIUrl":"https://doi.org/10.1002/ep.70429","url":null,"abstract":"<p>In this study, a bio-composite composed of TiO₂-incorporated bio-silica (BS), silk fibroin (SF), and polyurethane foam (PUF) was developed and evaluated as a photocatalytic material for the removal of Turquoise Blue (TB) dye. The prepared bio-composite was analyzed for its formation, surface morphology, and thermal properties using FTIR, XRD, TGA, and SEM, respectively. The amorphous nature of the composite was clearly revealed through XRD and SEM studies. Initially, the composite adsorbed a substantial amount of the dye on its surface in the dark, after which it underwent photocatalysis under light exposure. The photodegradation efficiency of the BS/SF/PUF/TiO₂ bio-composite for TB was assessed, and the results showed a significant enhancement in the photocatalytic degradation of TB compared to pure TiO₂. The degradation efficiency of BS/SF/PUF/TiO₂ reached approximately 99.96%. The high electron–hole charge separation capability was the driving force behind the consistent bandgap, which contributed to the exceptional photodegradation efficiency of the bio-composite. The bandgap of the BS/SF/PUF/TiO₂ bio-composite was determined to be 2.9 eV. The photodegradation efficiency was evaluated by varying parameters such as pH, irradiation time, catalyst dosage, and initial dye concentration. The experimental data were fitted to the Langmuir–Hinshelwood model to analyze the rate constant and explore the possible photocatalytic mechanism. This study demonstrates that the BS/SF/PUF/TiO₂ bio-composite holds significant potential as both an adsorbent and a photocatalyst for wastewater treatment, with the added advantage of being easily reusable.</p>","PeriodicalId":11701,"journal":{"name":"Environmental Progress & Sustainable Energy","volume":"45 5","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149206165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Smart green copper nanoparticles for dye-polluted water treatment","authors":"Mohamed A. Zayed,&nbsp;Hossam M. Abdel-Aziz,&nbsp;Soha A. Abdel-Gawad","doi":"10.1002/ep.70502","DOIUrl":"https://doi.org/10.1002/ep.70502","url":null,"abstract":"<p>The extensive utilization of synthetic dyes, such as Reactive Red S3B (RRS3B), and their discharge into water bodies has seriously threatened the environment and human health. Green zero-valent copper nanoparticles (Cu⁰ NPs) were synthesized via Ficus Benjamina leaves extract as a natural reducing and capping agent. FTIR and SEM were used to evaluate the generated Cu⁰ NPs, verifying their production, stability, and morphology. The ensuing nanoparticles of zero-valent copper ranged in size from 16.2 to 18.5 nm. Under various conditions, the adsorption and catalytic effectiveness of the Cu⁰ NPs in eliminating (decolorizing) RRS3B dye from aqueous solutions were precisely examined. After testing several adsorption models, the Langmuir isotherm (<i>q</i>_max = 126.58 mg g⁻¹, <i>R</i>² = 0.9995) showed the best fit, indicating monolayer adsorption. The kinetic analysis supported the pseudo-second-order model (<i>R</i>² = 0.9994), indicating chemisorption. Considering the information gathered and the successful research, the green Ficus-nZVCu adsorbent is a hopeful material for removing RRS3B owing to its high surface area and redox activity. Response surface methods and artificial neural network models confirmed the impact of major operational parameters. This study features the potential of green-synthesized Cu° NPs for the efficient and environmentally safe remediation of wastewater contaminated with dyes.</p>","PeriodicalId":11701,"journal":{"name":"Environmental Progress & Sustainable Energy","volume":"45 5","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149206218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"From reservoir to plate: monitoring irrigation water source as the dominant driver of vegetable microbial contamination risk in Sahelian smallholder systems","authors":"Adama Pamba Séré,&nbsp;Abdoudramane Sanou,&nbsp;Edwige Noëlle Roamba,&nbsp;Nabèrè Ouattara,&nbsp;Roger Dakuyo,&nbsp;Kabakdé Kaboré,&nbsp;Kiessoun Konaté,&nbsp;Donatien Kaboré,&nbsp;Mamoudou Hama Dicko","doi":"10.1007/s10661-026-16056-9","DOIUrl":"10.1007/s10661-026-16056-9","url":null,"abstract":"<div><p>Consumption of raw vegetables is a major foodborne exposure pathway in sub-Saharan Africa, yet the relative contribution of irrigation water quality versus on-farm hygiene practices to human contamination risk has rarely been quantified using a convergent, multi-method statistical framework. This study determined the relative weight of irrigation water source and Good Agricultural/Hygiene Practices (GAP/GHP) compliance as drivers of microbiological contamination, and thus human exposure risk, for raw vegetables in Northern Burkina Faso. Lettuce (<i>n</i> = 66) and tomato (<i>n</i> = 54) were sampled from 120 farms across three sites irrigated with reservoir, well, or borehole water. GAP/GHP compliance was scored by field audit; <i>Escherichia coli</i> and <i>Salmonella</i> spp. were quantified by ISO reference methods and analysed using ANOVA, logistic regression, random forest modelling, principal component analysis and k-means clustering. Irrigation water source was the dominant predictor of <i>E. coli</i> load (F = 61.6, <i>p</i> &lt; 0.001, eta-squared = 0.51), with mean loads of 3.00, 2.25 and 1.19 log CFU/g for reservoir, well and borehole water respectively; no <i>Salmonella</i> was detected in borehole-irrigated samples. Reservoir water was the primary <i>Salmonella</i> risk factor (OR = 3.82, 95% CI 1.29–11.3). Random forest modelling confirmed water source as the leading predictor (41.1% importance) ahead of hygiene practices (9.8%), and this ranking was stable across five independent analytical methods. We translate these findings into a field-deployable Water-Security Risk Score for extension services, and situate irrigation water source as a broadly relevant human exposure pathway across smallholder vegetable systems in the wider Sahel.</p></div>","PeriodicalId":544,"journal":{"name":"Environmental Monitoring and Assessment","volume":"198 11","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Optical properties of colored dissolved organic matter and their importance in the hypersaline Arabian Gulf to assess the status of the ecosystem and its influence on the northwestern Indian Ocean biogeochemistry: a review","authors":"Turki Al-Said,&nbsp;N. V. H. K. Chari,&nbsp;Rakhesh Madhusoodhanan","doi":"10.1007/s10661-026-16024-3","DOIUrl":"10.1007/s10661-026-16024-3","url":null,"abstract":"<div><p>This review summarizes the existing knowledge on the sources, composition, transformation, and biogeochemical importance of dissolved organic matter (DOM) in aquatic environments, based on observations of its optically measurable fraction, known as chromophoric dissolved organic matter (CDOM). Optical methods, including UV–visible absorption and fluorescence spectroscopy, spectral radiometry, and hyperspectral satellite remote sensing, provide valuable information on the distribution and dynamics of DOM, which are closely linked to physical transport, microbial transformations, and photochemical degradation in coastal and marine environments. The Arabian Gulf (AG) represents a distinct marine environment characterized by shallow bathymetry, hypersalinity, large seasonal temperature variability, semienclosed circulation, restricted water exchange, and relatively long residence times. These conditions, together with intense solar radiation, osmotic stress, limited terrestrial freshwater inputs, and increasing anthropogenic pressures, can strongly influence the sources, composition, and transformation of DOM. Within this dynamic environment, DOM may undergo transformations driven by seasonal biological production, benthic–pelagic interactions, sedimentary processes, and anthropogenic inputs, followed by further biological and photochemical processing. The formation of Persian Gulf water (PGW) mass in the AG and its export through the Strait of Hormuz into the subsurface waters of the northern Arabian Sea as a density-driven outflow may influence oxygen minimum zone (OMZ) dynamics and contribute to carbon biogeochemical cycling in the northern Indian Ocean. Despite the importance of these processes, significant knowledge gaps remain regarding the sources, composition, transformation, and fate of CDOM and its role in carbon cycling in the AG. Consequently, integrated in situ and remote sensing approaches for characterizing CDOM are essential to improve our understanding of DOM dynamics and carbon biogeochemical processes in the AG and in the northern Indian Ocean, particularly in the context of ongoing environmental and global climate change.</p></div>","PeriodicalId":544,"journal":{"name":"Environmental Monitoring and Assessment","volume":"198 11","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Contrasting associations of sea-ice meltwater and meteoric water with nitrogen uptake patterns in the summer Cosmonaut Sea, Antarctica","authors":"Kun Zhang,&nbsp;Qianyao Ma,&nbsp;Jun Zhao,&nbsp;Qiang Hao,&nbsp;Shunan Cao,&nbsp;Zifei Yang,&nbsp;Zhen Tang,&nbsp;Minfang Zheng,&nbsp;Mengya Chen,&nbsp;Jianfeng He,&nbsp;Min Chen","doi":"10.1002/lol2.70188","DOIUrl":"10.1002/lol2.70188","url":null,"abstract":"<p>Nitrogen uptake by phytoplankton influences Southern Ocean productivity and carbon export, but how source-resolved meltwater is associated with nitrate and ammonium use remains unclear. Here, ¹⁵N tracer incubations and a δ¹⁸O-salinity mixing model were combined to examine nitrogen uptake in the early-summer Cosmonaut Sea. Depth-integrated nitrate (<i>ρ</i>NO₃) and ammonium uptake (<i>ρ</i>NH₄) rates averaged 8.0 and 1.3 mmol m⁻² d⁻¹, respectively, yielding a mean <i>f</i>-ratio of 0.80. Meteoric water (MW) fractions were positively correlated with chlorophyll <i>a</i> (Chl <i>a</i>) concentration, the micro-sized (&gt; 20 <i>μ</i>m) Chl <i>a</i> fraction, and <i>ρ</i>NO₃, suggesting that MW-influenced waters were associated with higher biomass, larger size structure, and enhanced nitrate uptake. Sea-ice meltwater fractions were positively correlated with ambient <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msubsup>\u0000 <mi>NH</mi>\u0000 <mn>4</mn>\u0000 <mo>+</mo>\u0000 </msubsup>\u0000 </mrow>\u0000 <annotation>$$ {mathrm{NH}}_4^{+} $$</annotation>\u0000 </semantics></math> and <i>ρ</i>NH₄, consistent with greater regenerated nitrogen availability following sea-ice retreat and post-bloom recycling. These source-specific associations highlight the need to consider meltwater timing and source when assessing nitrogen assimilation pathways and biological-pump potential in Antarctic coastal waters.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 6","pages":""},"PeriodicalIF":7.3,"publicationDate":"2026-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70188","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149198892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}