IF 12.2 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-20 Epub Date: 2026-10-07 DOI: 10.1021/acs.est.6c06646

Yu-Ting Yang, Xing-Peng Wei, Yuan Meng, Wang-Bo Yuan, Jing-Xuan Zhou, Hong-Gang Ni

{"title":"Mechanistic Prediction and High-Throughput Risk Screening of Aquatic Contaminants Using Daphnia magna AOP Network","authors":"Yu-Ting Yang, Xing-Peng Wei, Yuan Meng, Wang-Bo Yuan, Jing-Xuan Zhou, Hong-Gang Ni","doi":"10.1021/acs.est.6c06646","DOIUrl":"10.1021/acs.est.6c06646","url":null,"abstract":"Traditional toxicological testing cannot meet regulatorydemandsfor numerous chemicals in aquatic environments. New Approach Methodologies(NAMs) such as High-Throughput Screening (HTS) and Adverse OutcomePathway (AOP) framework offer sustainable alternatives. Here, we builta comprehensive Quantitative Structure–Activity Relationship(QSAR) prediction and risk assessment framework that integrates amultidomain deep learning model, applicability domain assessment,and toxicity risk prioritization. Specifically, by applying in vitro HTS bioactivity to multiple Molecular InitiatingEvents (MIEs) and Key Events (KEs) in Daphnia magna AOP network, we compiled a data set (6971 chemicals × 10,024multidimensional structure descriptors) exhibiting high chemical structuraldiversity and strong representativeness of environmentally relevantchemicals. QSAR prediction models covering application domains ofmultiple MIEs/KEs were further developed. The 6971 chemicals wererisk-prioritized based on the AOP network topology, with the rankingresults consistent with existing toxicological evidence. In addition,chemicals with potential combined toxic risks were identified. Anout-of-the-box aquatic toxicity prediction and risk assessment toolis provided, enabling automated multitarget bioactivity prediction,reliability and decidability evaluation, and toxic risk profilingfor new chemicals. This study represents a concrete application of“AI for Science” in ecotoxicology, aiming to reducethe dependence on traditional animal experiments. It simplifies theidentification of potential toxic effects and bypasses in vivo validation processes to advance the sustainable managementof environmental chemicals.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"60 41","pages":"29325–29341"},"PeriodicalIF":12.2,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149151443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Depth-Independent Soil Organic Carbon Persistence across Climate Gradients in Coastal Wetlands 滨海湿地气候梯度下深度无关土壤有机碳持久性研究

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-20 DOI: 10.1021/acs.est.6c08028

Lele Wu,Zhaoliang Song,Lukas Van Zwieten,Haobo Wu,Xiaomin Yang,Laodong Guo,Ji Chen,Xinli Chen,Iain P. Hartley,Shaopan Xia,Yidong Wang,Sheng Xu,Ding He,Cong-Qiang Liu,Hailong Wang

{"title":"Depth-Independent Soil Organic Carbon Persistence across Climate Gradients in Coastal Wetlands","authors":"Lele Wu,Zhaoliang Song,Lukas Van Zwieten,Haobo Wu,Xiaomin Yang,Laodong Guo,Ji Chen,Xinli Chen,Iain P. Hartley,Shaopan Xia,Yidong Wang,Sheng Xu,Ding He,Cong-Qiang Liu,Hailong Wang","doi":"10.1021/acs.est.6c08028","DOIUrl":"https://doi.org/10.1021/acs.est.6c08028","url":null,"abstract":"Coastal wetland soils constitute a major global blue carbon pool. Yet, how soil organic carbon (SOC) persistence varies with soil depth and responds to climate change remains poorly understood. Here, we assessed depth-related patterns and climatic controls on SOC persistence using radiocarbon (Δ14C) measurements from 82 samples across 41 sites spanning temperate to tropical coastal wetlands. Radiocarbon-inferred SOC persistence did not differ significantly between topsoil (0–10 cm) and subsoil (40–60 cm) across climate zones and wetland types, with mean Δ14C values of −179.0 ± 155.5‰ and −200.9 ± 161.8‰, respectively (p > 0.05). Interactions among climate, vegetation, and soil biogeochemistry explained about 55% of the variation in SOC persistence in both topsoil and subsoil. Both layers exhibited comparable sensitivity to mean annual temperature and precipitation. However, the inferred regulatory pathways differed between soil layers, with stronger direct climatic effects in topsoil and greater indirect mediation through soil physicochemical and mineral-associated processes in subsoil. Across spatial climatic gradients, higher mean annual temperature and precipitation were associated with greater SOC accumulation but lower persistence, suggesting a potential trade-off between SOC quantity and persistence. These findings demonstrate limited vertical differentiation in SOC persistence between the 0–10 cm and 40–60 cm layers and highlight the need to better represent depth-specific regulatory processes in carbon-climate feedback frameworks.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"94 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Kinetic Aerosol Trapping Drives Arctic Enrichment of Organophosphate Flame Retardants 动力学气溶胶捕获驱动北极地区有机磷阻燃剂富集

IF 12.2 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-20 Epub Date: 2026-10-06 DOI: 10.1021/acs.est.6c09739

Dongchun Wang, Haibo Ma, Xiaxia Wang, Zixuan Li, Zhaoli Yang, Shuyi Li, Youran Niu, Xiaoxuan Mao, Tao Huang, Yuan Zhao, Hong Gao, Jianmin Ma

{"title":"Kinetic Aerosol Trapping Drives Arctic Enrichment of Organophosphate Flame Retardants","authors":"Dongchun Wang, Haibo Ma, Xiaxia Wang, Zixuan Li, Zhaoli Yang, Shuyi Li, Youran Niu, Xiaoxuan Mao, Tao Huang, Yuan Zhao, Hong Gao, Jianmin Ma","doi":"10.1021/acs.est.6c09739","DOIUrl":"10.1021/acs.est.6c09739","url":null,"abstract":"Organophosphateflame retardants (OPFRs) are emerging contaminantsposing significant risks to the Arctic environment and human health.Concerns have been raised about the origins of Arctic OPFRs becauseatmospheric models have failed to reproduce the high Arctic OPFR levelsdue to unresolved phase-partitioning dynamics and atmospheric chemistry.Here, we implement a kinetic gas-particle accumulation scheme, inwhich particle-bound OPFRs do not re-equilibrate to the gas phase,into the atmospheric chemistry model GEOS-Chem High Performance (GCHP)v14.5.0. A 2 × 2 factorial design crossing the partitioning mechanismwith hydroxyl radical (OH) chemistry isolates the importance of eachprocess. In the Arctic, kinetic accumulation reduces the apparentOH removal efficiency from 79% under equilibrium partitioning to 64%.The corresponding atmospheric lifetime of ΣOPFRs is extendedfrom 1.0 day under gas-phase-only conditions to 9.8 days under thekinetic accumulation framework. Sulfate and hydrophilic organic carbontogether carry over 90% of the Arctic particulate OPFR burden. Thiskinetic scheme increases the simulated Arctic annual mean ΣOPFRconcentration from 82 pg m–3 under gas-phase-onlyconditions and 145 pg m–3 under instantaneous equilibriumto 353 pg m–3, representing 4.3-fold and 2.4-foldincreases, respectively, consistent with field measurements acrossthe Arctic.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"60 41","pages":"29492–29501"},"PeriodicalIF":12.2,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149091986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Aerosol Deposition in the Human Respiratory System from Distinct Urban Sources Using Multiple Exposure Metrics 基于多重暴露度量的不同城市源气溶胶在人类呼吸系统中的沉积

IF 12.2 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-20 Epub Date: 2026-10-08 DOI: 10.1021/acs.est.6c10850

Imre Salma, Máté Vörösmarty, Árpád Farkas

{"title":"Aerosol Deposition in the Human Respiratory System from Distinct Urban Sources Using Multiple Exposure Metrics","authors":"Imre Salma, Máté Vörösmarty, Árpád Farkas","doi":"10.1021/acs.est.6c10850","DOIUrl":"10.1021/acs.est.6c10850","url":null,"abstract":"Targeting specific aerosol sources offers more effectiveair-qualitycontrol than focusing solely on ambient concentrations. Using sourceapportionment, major contributors to particle number concentrationsin the diameter range of 6–1000 nm in urban background of Budapest,Hungary were identified, and their size distributions applied in lungdeposition modelling under reference breathing conditions. In thisstudy, we find that most particles penetrate to the deep lung witha maximum deposition at airway generations 17 to 21 depending on physicalactivity. Deposition fractions vary substantially by source, rangingfrom 76% (new particle formation) to 27% (solid fuel combustion).Exercise enhances overall deposition, and redistributes the depositedparticles within the respiratory tract by decreasing extra-thoracicdeposition and increasing the alveolar fraction. Our results alsoshow that deposition rates are more sensitive to physical activitythan deposition fractions. These deposition curves exhibit a levelling-offtendency in the extra-thoracic region, while continuing to increasein the lung. Particle number and particle surface area depositioncurves are similar in shape, although the relative importance of aerosolsources and the most affected respiratory regions differ. We pointthat surface-density deposition rates are three orders of magnitudehigher in the nose and mouth than in the lung.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"60 41","pages":"29515–29526"},"PeriodicalIF":12.2,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149151407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Persistent Desorption, Aging, and Secondary VOC Formation from Biomass-Burning Emissions on Indoor Surfaces 室内表面生物质燃烧排放物的持续解吸、老化和二次VOC形成

IF 12.2 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-20 Epub Date: 2026-10-03 DOI: 10.1021/acs.est.6c05801

Shiqian Long, Xiaoqiao Jiao, Wenting Yuan, Weilin Huang, Wangchao Zhao, Bo Yang, Lifang Zhang, Li Zhou, Jiwen Xu, Huifan Deng, Chen Wang

{"title":"Persistent Desorption, Aging, and Secondary VOC Formation from Biomass-Burning Emissions on Indoor Surfaces","authors":"Shiqian Long, Xiaoqiao Jiao, Wenting Yuan, Weilin Huang, Wangchao Zhao, Bo Yang, Lifang Zhang, Li Zhou, Jiwen Xu, Huifan Deng, Chen Wang","doi":"10.1021/acs.est.6c05801","DOIUrl":"10.1021/acs.est.6c05801","url":null,"abstract":"Biomass burning (BB) degrades indoorair quality boththrough directemissions and via smoke sorption onto surfaces, resulting in persistentpollutant re-emission and transformation. However, the dynamics ofthis multiphase process remain unclear. This study investigates there-emission, chemical aging, and secondary product formation of smokeresidues on three representative indoor surfaces (glass, cotton, andgypsum). Smoke-contaminated surfaces re-emitted 120–180 distinctvolatile organic compounds (VOCs). After 2 weeks of ventilation, themedian emission rates of various VOCs from porous cotton and gypsum(3.3 and 4.2 μg m–2 h–1)far exceeded that from glass (0.06 μg m–2 h–1), reflecting their greater sorption capacity andlonger pollutant persistence. The emission increased by factors of7 and 4 on glass and cotton when relative humidity (RH) rose from20% to 80%, attributed to enhanced initial sorption. Smoke-sorbedgypsum showed a strong ozone (O3) uptake coefficient ((1.6± 0.2) × 10–5 at 50 ppb O3,20% RH), approximately 20 times that on glass, confirming its roleas a key indoor O3 sink. Heterogeneous transformation ofsurface residues produced secondary VOCs, including aldehydes andcarboxylic acids, further deteriorating indoor air quality. Thesefindings demonstrate the critical and prolonged influence of surface-retainedBB emissions on indoor air chemistry.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"60 41","pages":"29468–29478"},"PeriodicalIF":12.2,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149091530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Taming Biotic-Abiotic Interface with Atomic Defects for Efficient Hydrogen Production from Wastewater 利用原子缺陷驯化生物-非生物界面用于废水高效制氢

IF 12.2 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-20 Epub Date: 2026-10-06 DOI: 10.1021/acs.est.6c04332

Furong Guo, Minzi Liao, Jiahao Wang, Hao Zhang, Jundi Cheng, Chenglin Hao, Sicong Ma, Biao Zhou, Bing Zhou, Jinming Luo, Yitao Pan, Yancai Yao, Hao Li, Lizhi Zhang

{"title":"Taming Biotic-Abiotic Interface with Atomic Defects for Efficient Hydrogen Production from Wastewater","authors":"Furong Guo, Minzi Liao, Jiahao Wang, Hao Zhang, Jundi Cheng, Chenglin Hao, Sicong Ma, Biao Zhou, Bing Zhou, Jinming Luo, Yitao Pan, Yancai Yao, Hao Li, Lizhi Zhang","doi":"10.1021/acs.est.6c04332","DOIUrl":"10.1021/acs.est.6c04332","url":null,"abstract":"Sluggish interfacial kinetics at the bio-abiotic junctionfundamentallybottleneck the efficiency of microbial electrochemical hydrogen productionfrom wastewater, as electronic barriers and rigid water networks obstructthe seamless transport of electrons and protons. We surmount thesesynergistic challenges by coupling Shewanella oneidensis MR-1 with vacancy-engineered pyrite (FeS2), achievingan impressive H2 evolution rate of 1.92 mmol h–1 with high operational stability (100 h at 60 mA cm–2). In situ spectroscopy and molecular dynamics (MD)simulations suggest that under-coordinated Fe sites associated withsulfur vacancies facilitate electron transfer through coordination-assistedinteractions with microbial cytochromes, while localized charge polarizationdisrupts the ordered four-coordinate water network to facilitate interfacialproton transfer. A solar-powered prototype treating authentic foodwaste leachate demonstrates a 4.7% solar-to-hydrogen efficiency. Life-cycleand techno-economic analyses confirm the system’s sustainability,yielding a net profit of $0.70 per ton of wastewater and a minimizedcarbon emissions potential of 0.33 kg CO2 equivalent. Thiswork establishes vacancy-enabled biotic-abiotic interface engineeringas a transformative strategy for optimizing interfacial microenvironmentsin high-performance noble-metal-free bio-electrochemical energy recovery.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"60 41","pages":"29618–29628"},"PeriodicalIF":12.2,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149091981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Spatially Refined Analysis of Emission Burdens and Equity from Light-, Medium-, and Heavy-Duty Vehicle Traffic in the United States 美国轻型、中型和重型车辆交通排放负担和公平性的空间精细分析

IF 12.2 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-20 Epub Date: 2026-10-07 DOI: 10.1021/acs.est.6c12227

Brittany Antonczak, Clare Nelson, Tammy M. Thompson, Mindi W. DePaola, Gregory Rowangould

{"title":"Spatially Refined Analysis of Emission Burdens and Equity from Light-, Medium-, and Heavy-Duty Vehicle Traffic in the United States","authors":"Brittany Antonczak, Clare Nelson, Tammy M. Thompson, Mindi W. DePaola, Gregory Rowangould","doi":"10.1021/acs.est.6c12227","DOIUrl":"10.1021/acs.est.6c12227","url":null,"abstract":"We estimate block-levelemission intensities of nitrogen oxides(NOX) and fine particulate matter (PM2.5) fromon-road vehicle traffic for every census block in the United States,combining MOVES-based emission factors with street level traffic data.We use this spatially refined, computationally efficient, and policy-sensitivemetric to evaluate emissions burden. Despite comprising less than11% of vehicle kilometers traveled, we find that medium- and heavy-dutytrucks account for 46% of NOX and 50% of PM2.5 emission burden nationally ─ with PM2.5 burdenfrom trucks dominated by exhaust emissions while tire and brake wearconstitute nearly half of light-duty vehicle PM2.5 burden.People of color face emission burdens averaging 40% above the nationalmean, with Asian populations exceeding 60%, and lower-income populationsface 20–25% higher burdens. Statistically significant racial-ethnicor income disparities are present in 85–89% of US counties.Critically, these disparities are not confined to large metropolitanareas. They are widespread across both urban and rural counties nationwide.We also show that spatial aggregation substantially attenuates estimateddisparities of burdened groups, underscoring the importance of spatiallyrefined analysis.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"60 41","pages":"29527–29539"},"PeriodicalIF":12.2,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149092384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

60 Years of Biogeochemistry and Remediation Science 生物地球化学与修复科学60年

IF 12.2 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-20 DOI: 10.1021/acs.est.6c15296

Paul G. Tratnyek, Heileen Hsu-Kim, Sukhwan Yoon

引用次数: 0

Resource-Oriented Wastewater Treatment through Quorum Quenching─Integration of AnMBR and Donnan Dialysis 群体淬灭资源型废水处理─AnMBR与Donnan透析的集成

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-20 DOI: 10.1021/acs.est.6c05848

Hongyu Zhang,Yuxuan Wan,Liqiu Zhang,Huarong Yu,Haiyang Yang,Fangshu Qu

{"title":"Resource-Oriented Wastewater Treatment through Quorum Quenching─Integration of AnMBR and Donnan Dialysis","authors":"Hongyu Zhang,Yuxuan Wan,Liqiu Zhang,Huarong Yu,Haiyang Yang,Fangshu Qu","doi":"10.1021/acs.est.6c05848","DOIUrl":"https://doi.org/10.1021/acs.est.6c05848","url":null,"abstract":"Aligned with United Nations Sustainable Development Goal 6, water treatment is shifting from pollution removal to resource recovery and circularity. An integration of AnMBR and a Donnan dialysis (DD) (AnMBR-DD) was proposed to simultaneously recover methane and ammonium, and quorum quenching (QQ) was further incorporated to mitigate membrane fouling and enhance process efficiency. The COD removal efficiency was stably maintained above 80%, and the methane conversion efficiency reached 51.6%. The effluent NH4+-N concentration was controlled at 3–5 mg/L, with a recovery efficiency of 47.1% in the AnMBR-DD. The QQ effectively alleviated biofouling on the ultrafiltration membrane in the AnMBR and ion exchange membrane in the DD, while improving methane production and ammonia recovery by 20.6% and 6.6%, respectively. These improvements were mainly attributed to QQ-induced reductions in extracellular polymeric substances (EPS), which weakened microbial adhesion and decreased biofilm compactness. Life cycle assessment showed that coupled methane and ammonium recovery in AnMBR-DD-QQ were the decided advantages in alleviating the environmental impact. These results highlight the great potential of AnMBR-DD-QQ as a resource-oriented wastewater treatment strategy.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"2 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Molecular Evolution of Dissolved Organic Nitrogen from Photoaged Nitrogen-Containing Microplastics Reveals Amine Structures as Key Nitrosamine Precursors 光老化含氮微塑料中溶解有机氮的分子演化揭示了胺结构是亚硝胺的关键前体

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-20 DOI: 10.1021/acs.est.6c12418

Run Zhou,Jiayi Shi,Yuanren Jiang,Zhuo Gao,Fei Yang,Kecheng Zhu,Hanzhong Jia

{"title":"Molecular Evolution of Dissolved Organic Nitrogen from Photoaged Nitrogen-Containing Microplastics Reveals Amine Structures as Key Nitrosamine Precursors","authors":"Run Zhou,Jiayi Shi,Yuanren Jiang,Zhuo Gao,Fei Yang,Kecheng Zhu,Hanzhong Jia","doi":"10.1021/acs.est.6c12418","DOIUrl":"https://doi.org/10.1021/acs.est.6c12418","url":null,"abstract":"Although dissolved organic nitrogen (DON) is continuously released and transformed as nitrogen-containing microplastics (N-MPs) age, the evolution of this replenished pool and its reactivity during downstream chloramination remains unresolved. Here, we tracked the compositional evolution of DON molecules in polyamide (PA) and polyacrylonitrile (PAN) suspensions under UV irradiation using a nitrogen atom-based molecular classification strategy (N1–N5). After 7 d of irradiation-induced molecular reorganization, N1–N5 molecules accounted for 87% and 79% of the molecular signal intensity in PA-DOM and PAN-DOM, respectively. Eight annotated compounds followed increasing, decreasing, or transient accumulation trajectories, revealing simultaneous molecular accumulation and depletion. Reaction-network analysis further showed that N1–N5 molecules progressively became the dominant reactants, and these trajectories were dominated by oxidation and accompanied by increasingly frequent amine-related transformation links. Structural analysis revealed amide-rich N1–N2 and N-heterocycle-rich N3–N5 molecules, while secondary and tertiary amines occurred across all N1–N5 classes. As this molecular reorganization progressed, N-MP-DON level dropped, but substantially enhanced N-nitrosodimethylamine and N-nitrosodiethylamine formation, and potential precursor identification was strongly associated with amine structures, rather than nitrogen atom number. Overall, our study highlights N-MP-DON as a potential source of nitrosamine precursors, and the need to carefully consider amine-containing additives use in plastic manufacturing.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"16 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

环境科学与技术最新文献