IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-19 DOI: 10.1021/acs.est.6c07733

Richard F. Carbonaro,Alan T. Stone

{"title":"Role of Coordination Environment in the Oxidation of CrIII Aminocarboxylate Complexes by Hydrous Manganese Oxide","authors":"Richard F. Carbonaro,Alan T. Stone","doi":"10.1021/acs.est.6c07733","DOIUrl":"https://doi.org/10.1021/acs.est.6c07733","url":null,"abstract":"Oxidation of CrIII to CrVI by MnIII,IV (hydr)oxides plays an important role in controlling chromium mobility and toxicity in soils and sediments. Previous studies on CrIII oxidation by hydrous manganese oxide (HMO) reveals that reaction rates are highly sensitive to CrIII speciation, with aminocarboxylate complexes exhibiting reaction-induced Mn2+ accumulation at HMO surfaces, which progressively inhibits CrVI production. In this work, we compare initial CrVI production rates for well-defined, presynthesized CrIII–aminocarboxylate complexes with the chelating agents iminodiacetic acid (IDA), nitrilotriacetic acid (NTA), N-(2-hydroxyethyl)ethylenediaminetriacetic acid (HEDTA), and ethylenediaminetetraacetic acid (EDTA). Initial-rate measurements minimize the influence of secondary ligand oxidation, reaction-generated MnII, and associated changes in HMO reactivity, thereby providing a common basis for comparing the effects of CrIII coordination environment. Initial CrVI production rates spanned 8 orders of magnitude and generally decrease as aminocarboxylate ligands occupy a greater fraction of the CrIII coordination sphere and fewer coordination positions remain occupied by H2O and OH–. These results demonstrate that CrIII oxidation by Mn oxides is acutely sensitive to the CrIII coordination environment, with important implications for CrVI formation in natural and engineered systems. These findings demonstrate that meaningful prediction of CrVI formation requires explicit consideration of CrIII speciation.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"16 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221664","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

Research Priorities for a Circular Economy for Plastic Sustainability in the Caribbean 加勒比地区塑料可持续性循环经济的研究重点

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-19 DOI: 10.1021/acs.est.5c16637

Anne Marie Mozrall,Jessica P. Feliz Garrido,Pamela Tejada-Tejada,Akeem Mohammed,Brigitte Mildred Roldán Ramírez,Alana Malinde S.N. Lancaster,Iris Odett Atencio,Diego Batista,Denise Delvalle-Borrero,Christian Espinal,Ana De León,Sarra Gaspard,Ulises Jauregui-Haza,Phaedra C. Pezzullo,Mariely Ponciano,Jeffrey V. Smith,Laura Vásquez,Rafael Vasquez,Amy E. Landis

{"title":"Research Priorities for a Circular Economy for Plastic Sustainability in the Caribbean","authors":"Anne Marie Mozrall,Jessica P. Feliz Garrido,Pamela Tejada-Tejada,Akeem Mohammed,Brigitte Mildred Roldán Ramírez,Alana Malinde S.N. Lancaster,Iris Odett Atencio,Diego Batista,Denise Delvalle-Borrero,Christian Espinal,Ana De León,Sarra Gaspard,Ulises Jauregui-Haza,Phaedra C. Pezzullo,Mariely Ponciano,Jeffrey V. Smith,Laura Vásquez,Rafael Vasquez,Amy E. Landis","doi":"10.1021/acs.est.5c16637","DOIUrl":"https://doi.org/10.1021/acs.est.5c16637","url":null,"abstract":"Caribbean countries bear a disproportionate burden of marine plastic pollution because of their small landmass, high population density, and insufficient waste management infrastructure. Many Caribbean nations depend on informal, unmanaged landfills, underscoring an urgent need for more resilient, sustainable systems. This perspective synthesizes existing data to map the region’s plastic waste landscape and leverages regional expertise to identify key research priorities. This work emerged from interdisciplinary international professionals and members of the CEPlaSt (circular economy for plastic sustainability) network. A major barrier to circularity is the lack of reliable data on waste composition and flows, alongside stark infrastructure disparities across the wider Caribbean region. Addressing these gaps through targeted investment and region-specific planning is essential to modernize waste systems, reduce plastic emissions, and advance a sustainable Caribbean plastic circular economy.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"33 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210888","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

Kinetics of CO2 Hydrate Formation and Chemical-Potential-Driven Dissociation in Porous Media 多孔介质中CO2水合物形成及化学势驱动解离动力学研究

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-19 DOI: 10.1021/acs.est.6c12008

Saleh Mohammadrezaei,Lifei Yan,Jeroen Snippe,Rouhi Farajzadeh,Vahid Niasar

{"title":"Kinetics of CO2 Hydrate Formation and Chemical-Potential-Driven Dissociation in Porous Media","authors":"Saleh Mohammadrezaei,Lifei Yan,Jeroen Snippe,Rouhi Farajzadeh,Vahid Niasar","doi":"10.1021/acs.est.6c12008","DOIUrl":"https://doi.org/10.1021/acs.est.6c12008","url":null,"abstract":"Gas hydrates can form when water and a guest gas coexist within the hydrate stability field. Gas hydrates in porous rocks block flow fields. During CO2 storage in depleted reservoirs, pressure reduction and Joule–Thomson cooling may place near-well regions within the CO2 hydrate stability zone, raising concerns about injectivity loss. Hydrate stability is commonly inferred from the bulk pressure–temperature (P–T) phase diagram, which neglects flow and gas humidity transport under sustained flow. Using time-resolved optical microscopy in a “fish-bone” micromodel at fixed P and T, we find that injecting low-humidity CO2 produces a pore-scale cycle of hydrate formation and dissociation. The hydrate nucleates along gas–water–solid contact lines and grows by consuming CO2 dissolved in trapped pore water and then slows as CO2 supply becomes diffusion-limited through the hydrate layer. Despite constant bulk P and T, the low humidity of the injected CO2 extracts water as vapor, creating a water chemical potential deficit at the gas–hydrate interface and driving an inlet-to-outlet dissociation front. These results show that hydrate persistence under flow depends on pore-scale transport and gas-side water chemical potential and cannot be inferred from bulk P–T stability conditions alone.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"15 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221662","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

Associations of PM2.5 and Its Oxidative Potential with Childhood Allergy-Related Symptoms: A Cross-Sectional Study in Guangdong Province, China PM2.5及其氧化电位与儿童过敏相关症状的关系：中国广东省的一项横断面研究

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-19 DOI: 10.1021/acs.est.6c05462

Siqi Wang,Dan Cai,Jinshan Ge,Qian Yao,Xihua Lin,Yunhui Shao,Luyin Wu,Yunjiang Yu,Guanghui Dong,Shexia Ma

{"title":"Associations of PM2.5 and Its Oxidative Potential with Childhood Allergy-Related Symptoms: A Cross-Sectional Study in Guangdong Province, China","authors":"Siqi Wang,Dan Cai,Jinshan Ge,Qian Yao,Xihua Lin,Yunhui Shao,Luyin Wu,Yunjiang Yu,Guanghui Dong,Shexia Ma","doi":"10.1021/acs.est.6c05462","DOIUrl":"https://doi.org/10.1021/acs.est.6c05462","url":null,"abstract":"Evidence linking PM2.5 exposure to allergic symptoms remains limited and inconsistent, partly because most studies rely on mass-based metrics alone. We conducted a population-based study among 131,346 children aged 6–18 years in six cities of Guangdong, China, to compare associations of PM2.5 mass concentration, oxidative potential (OP), and chemical components (metals, carbonaceous components, and ions) with rhinitis, rhinoconjunctivitis, and eczema symptoms. OP was assessed using the dithiothreitol assay and expressed as volume-normalized (DTTv) and mass-normalized (DTTm) metrics. PM2.5 mass and OP were generally positively associated with the three allergy-related symptoms. OP, particularly DTTm, provided more consistent and robust evidence of associations across outcomes than PM2.5 mass, supported by lower AIC/BIC values and greater stability in two-pollutant models. Single-component and mixture analyses indicated that multiple PM2.5 constituents contributed to allergy-related symptoms, and OP may partly explain the associations of Co, OC, Cu, and Hg, with the largest estimated indirect proportion reaching 36.2% for OC and rhinoconjunctivitis symptoms through DTTm. These findings suggest that OP captures health-relevant characteristics beyond particle mass and may serve as a complementary exposure indicator for understanding childhood symptoms of allergic diseases.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"73 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210887","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

Analysis of the Potential Mediating Role of Plasma Proteins in the Association Between Air Pollution Exposure and Lung Cancer Risk Among Ever-Smokers 血浆蛋白在长期吸烟者空气污染暴露与肺癌风险之间的潜在中介作用分析

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-19 DOI: 10.1021/acs.est.6c07407

Ziyin Tang,Donghai Liang,Jeremy A. Sarnat,W. Ryan Diver,Todd M. Everson,Emily Deubler,Youran Tan,Aparna H. Kesarwala,Michelle C. Turner,Mattias Johansson,Hilary A. Robbins,Carmen J. Marsit,Alpa V. Patel,Ying Wang

{"title":"Analysis of the Potential Mediating Role of Plasma Proteins in the Association Between Air Pollution Exposure and Lung Cancer Risk Among Ever-Smokers","authors":"Ziyin Tang,Donghai Liang,Jeremy A. Sarnat,W. Ryan Diver,Todd M. Everson,Emily Deubler,Youran Tan,Aparna H. Kesarwala,Michelle C. Turner,Mattias Johansson,Hilary A. Robbins,Carmen J. Marsit,Alpa V. Patel,Ying Wang","doi":"10.1021/acs.est.6c07407","DOIUrl":"https://doi.org/10.1021/acs.est.6c07407","url":null,"abstract":"The biological mechanisms linking air pollution to lung carcinogenesis remain underexplored. This study aimed to identify key proteins and pathways involved in mediating the effects of air pollutants on lung cancer risk. We analyzed 95 matched lung cancer case–control pairs of ever-smokers with prediagnosis plasma protein profiles measured in the Cancer Prevention Study-II Nutrition Cohort. We assessed associations between protein levels and six individual air pollutants, air pollution mixture, and lung cancer risk, adjusting for confounders and multiple testing. We identified overlapping proteins and enriched pathways associated with both exposures and lung cancer risk, followed by an exploratory high-dimensional mediation analysis (HIMA) to investigate the potential mediating roles of proteins. Seventeen proteins were associated with both exposures and lung cancer, including CX3CL1, ADAM15, and CXCL17 (P < 0.05). HIMA identified six proteins, including CX3CL1 and CXCL17, as potential mediating proteins of individual pollutant-lung cancer associations (Bonferroni-corrected P < 0.05), while these findings did not remain significant when excluding cases diagnosed within one year of blood draw. The exploratory results suggest that proteins and pathways related to inflammatory chemokine signaling, immune modulation, and altered cell proliferation, migration, and survival may play significant roles in air pollution-lung cancer association among ever-smokers.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"64 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221641","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

Parenteral Nutrition as a Source of Xenobiotic Exposure in Preterm Infants in a Single-Center Case Study 在一项单中心案例研究中，肠外营养作为早产儿外源性暴露的来源

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-19 DOI: 10.1021/acs.est.6c12407

Michael Eigenschink,Nika Wattaul,Sabrina Berger,Jesse Peach,Ernst W. Müllner,Angelika Berger,Benedikt Warth,Harald H. Sitte,Lukas Wisgrill

{"title":"Parenteral Nutrition as a Source of Xenobiotic Exposure in Preterm Infants in a Single-Center Case Study","authors":"Michael Eigenschink,Nika Wattaul,Sabrina Berger,Jesse Peach,Ernst W. Müllner,Angelika Berger,Benedikt Warth,Harald H. Sitte,Lukas Wisgrill","doi":"10.1021/acs.est.6c12407","DOIUrl":"https://doi.org/10.1021/acs.est.6c12407","url":null,"abstract":"In premature infants, successful ex utero maturation depends on endogenous and exogenous stimuli. Chemical insults during this period may impact long-term development. Given immature hepatic biotransformation, parenteral xenobiotic exposure may be of particular toxicological relevance. We conducted a single-center case study to characterize the xenobiotic burden of neonatal parenteral nutrition (PN). A standardized PN regimen for a 28-week, 1000 g reference infant was passed through infusion lines and the flow-through analyzed via a multianalyte exposome LC-MS/MS assay. Eighteen of 221 targeted xenobiotics were detected. Diisononyl phthalate (DINP, 780 ng/mL), bisphenol A (BPA, 250 ng/mL), methylparaben (MP, 74 ng/mL), and 5-hydroxymethyl-2-furanoic acid (HMFA, 43 ng/mL) showed the highest mean concentrations. The estimated daily intake of BPA (9.5 μg/kg bw/d) exceeded calculated and official Health-Based Guidance Values. Consistent with immature detoxification, pharmacokinetic modeling suggested accumulation of DINP, MINP, and free BPA in premature infants. The higher predicted exposure of premature infants to free BPA warrants investigation into 4-methyl-2,4-bis(4-hydroxyphenyl)pent-1-ene (MBP) formation under potentially saturated Phase II metabolism. An exploratory analysis of plasma data from extremely premature infants indicated PN as a contributory rather than predominant source of intervention-related exposure. These findings represent a relevant clinical reference scenario rather than a population-wide exposure estimate.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"12 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221666","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

Regional Impacts of Unconventional Oil and Gas Operations on Ozone and Air Toxics 非常规油气作业对臭氧和空气有毒物质的区域影响

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-19 DOI: 10.1021/acs.est.6c03632

Yongtao Hu,Kamal Jyoti Maji,M. Talat Odman,Jennifer Kaiser,Armistead G. Russell

{"title":"Regional Impacts of Unconventional Oil and Gas Operations on Ozone and Air Toxics","authors":"Yongtao Hu,Kamal Jyoti Maji,M. Talat Odman,Jennifer Kaiser,Armistead G. Russell","doi":"10.1021/acs.est.6c03632","DOIUrl":"https://doi.org/10.1021/acs.est.6c03632","url":null,"abstract":"Unconventional oil and gas development (UOGD) has expanded over the past three decades and now accounts for most of U.S. oil and natural gas production. Although prior studies link local UOGD activity to health outcomes, they provide limited evidence directly attributing ambient pollutant levels to UOGD emissions. We address this gap by quantifying UOGD impacts on ozone and air toxics using the Community Multiscale Air Quality (CMAQ) model with the Integrated Source Apportionment Method (ISAM), enabling an explicit linkage between UOGD emissions and ambient concentrations. UOGD activities produce substantial local contributions to primary air toxics and continental-scale influences on ozone. Across CONUS, UOGD increases population-weighted annual averages of maximum daily average 8-h (MDA8) ozone, 1-h benzene, 1-h nitrogen dioxide (NO2), and 1-h formaldehyde (HCHO) concentrations by roughly 1 ppb, 1.1 ppt, 0.035 ppb, and 0.03 ppb, respectively. Annual maximum UOGD contributions to MDA8 ozone are about half of those from other anthropogenic sources. ISAM also reveals unexpectedly large UOGD-driven ozone enhancement (up to 4–5 ppb) in the Los Angeles region from Texas emissions, a feature less evident in brute-force sensitivity tests. These findings highlight the need to further examine interstate UOGD influences on nonattainment areas and source-impact quantification methods.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"71 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221668","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

Fe3+ Activation of Metal Sulfides for High-Performance Mercury Removal from Nonferrous Smelting Gas: A Dual Mercury Adsorption Mechanism Fe3+活化金属硫化物用于有色冶炼气体中高效除汞：双汞吸附机制

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-19 DOI: 10.1021/acs.est.6c09451

Zixi Zhang,Chaolong Liu,Zhixing Huang,Kaisong Xiang,Fenghua Shen,Hui Liu

{"title":"Fe3+ Activation of Metal Sulfides for High-Performance Mercury Removal from Nonferrous Smelting Gas: A Dual Mercury Adsorption Mechanism","authors":"Zixi Zhang,Chaolong Liu,Zhixing Huang,Kaisong Xiang,Fenghua Shen,Hui Liu","doi":"10.1021/acs.est.6c09451","DOIUrl":"https://doi.org/10.1021/acs.est.6c09451","url":null,"abstract":"Atmospheric elemental mercury (Hg0) emitted from the nonferrous metallurgy industry poses severe risks to ecosystems. Although metal sulfides are promising in Hg0 adsorption under high-concentration SO2 conditions, they typically suffer from poor performance at elevated temperatures due to weak binding affinity. Herein, a trivalent iron (Fe3+) activation strategy to boost Hg0 adsorption activity of metal sulfides was developed for the first time, which leverages electron-deficient Fe3+ to induce electronic reconstruction. This Fe3+ activation strategy is applicable to various metal sulfides, generating Fe sites with high activity and stability. Among the various candidates, the Fe3+-activated MoS2 delivers a record-theoretical saturated Hg0 adsorption capacity of 69.56 mg·g–1 at 150 °C, which is 4.35 times higher than that of pristine MoS2. The sulfur vacancies on MoS2 serve as the key anchoring sites for Fe3+, generating stable single-atom, dimer, and trimer Fe configurations. These new Fe centers, benefiting from charge modulation, can simultaneously adsorb two Hg atoms via charge transfer and orbital hybridization. The Fe3+-activated MoS2 exhibits strong resistance to SO2 and H2O, maintaining high Hg0 removal efficiency under a smelting gas atmosphere. This work reveals new configurations of Hg adsorption and provides a convenient route to design high-performance sorbents for heavy metal purification.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"12 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221658","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

Atmospheric Concentrations and Emissions of Major HFCs at Six Background Stations in China during 2012–2023 2012-2023年中国6个本底站大气主要氢氟碳化物浓度及排放

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-19 DOI: 10.1021/acs.est.6c08334

Chen Wang,Wanqi Sun,Bo Yang,Dongqiao Wu,Ningzhang Wang,Qianli Ma,Peng Wang,Liyan Zhou,Haiyang Cai,Zhen Li,Lixin Liu

{"title":"Atmospheric Concentrations and Emissions of Major HFCs at Six Background Stations in China during 2012–2023","authors":"Chen Wang,Wanqi Sun,Bo Yang,Dongqiao Wu,Ningzhang Wang,Qianli Ma,Peng Wang,Liyan Zhou,Haiyang Cai,Zhen Li,Lixin Liu","doi":"10.1021/acs.est.6c08334","DOIUrl":"https://doi.org/10.1021/acs.est.6c08334","url":null,"abstract":"In this study, a long-term atmospheric observation of HFC-23, -32, -125, -134a, -143a, and -152a was conducted at six background stations across China from 2011 to 2023. Using a tracer ratio method with HCFC-22 as the reference, emissions from four main economic regions, Northeast Plain (NEP), North China Plain (NCP), Yangtze River Delta (YRD), and Central South China (CSC), were estimated, and their trends were analyzed over four phases: Phase 1 (2012–2016), Phase 2 (2017–2018), Phase 3 (2019–2020), and Phase 4 (2021–2023). The results show that from 2011 to 2023, the atmospheric mixing ratios of all studied HFCs except HFC-152a exhibited increasing trends. Nationally, emissions of HFC-23 show a decreasing tendency during Phase 4, while emissions of HFC-32, -125, -134a, and -143a continued to rise throughout Phases 3 and 4. These four HFCs were identified as the dominant species, accounting for over 76% of total HFCs’ mass emissions. From Phase 3 to Phase 4, CO2-equivalent HFC emissions per capita increased slightly, whereas emissions per unit GDP decreased, which is mainly attributable to significant HFC reductions in the CSC region. Nevertheless, China’s average HFC emission intensities (whether calculated per unit GDP or per capita) remain approximately 1.5–1.6 times the global average.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"1 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221665","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

Divergent Responses of Manganese Oxides to Olivine Dissolution and Their Control on Trace Metal Fates under an Ocean Alkalinity Enhancement Scenario 海洋碱度增强条件下锰氧化物对橄榄石溶解的不同响应及其对微量金属命运的控制

IF 9.028 1区环境科学与生态学

环境科学与技术 Pub Date : 2026-10-19 DOI: 10.1021/acs.est.6c12947

Wen Zhuang,Feng Li,Xiaotong Wang,Jihua Liu

{"title":"Divergent Responses of Manganese Oxides to Olivine Dissolution and Their Control on Trace Metal Fates under an Ocean Alkalinity Enhancement Scenario","authors":"Wen Zhuang,Feng Li,Xiaotong Wang,Jihua Liu","doi":"10.1021/acs.est.6c12947","DOIUrl":"https://doi.org/10.1021/acs.est.6c12947","url":null,"abstract":"Olivine-based ocean alkalinity enhancement (OAE) is a promising carbon dioxide removal technology; however, the geochemical fate of olivine-derived toxic metals, particularly nickel (Ni) and chromium (Cr) at marine sediment interfaces, remains poorly constrained. We employed dialysis-membrane microcosms to isolate olivine from Mn oxides, allowing only dissolved species to diffuse and react under three olivine loadings (1, 5, and 10 g L–1) in seawater for 60 days. Results revealed that (1) Ni was preferentially sequestered by the Mn oxides, with δ-MnO2 showing higher uptake capacity than birnessite, (2) Cr was co-sequestered with secondary Fe(III) (oxyhydr)oxides rather than adsorbing directly onto Mn oxides, and (3) synergistic Ni2+ isomorphic substitution and Fe(II)-driven Mn(III) reduction rearranged δ-MnO2 into a more stable hexagonal layered framework. Consequently, both δ-MnO2 and birnessite act as long-term Ni sinks, preventing Ni remobilization via desorption or diagenetic phase transitions. These findings support a proposed “spatial decoupling” OAE strategy, where olivine is pre-dissolved in land- or ship-based reactors to remove Cr via Fe co-precipitation. Subsequent discharge of the Ni-bearing alkaline effluent into shallow coastal regions allows benthic Mn oxides to scavenge Ni, reducing toxicity risks associated with direct mineral contact.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"73 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149221657","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

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