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Particle number size distribution and new particle formation in Xiamen, the coastal city of Southeast China in wintertime

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Science of the Total environment 2022年 826卷 154208-154208页

作者： Wang, Jing Li, Mengren Li, Lingjun Zheng, Ronghua Fan, Xiaolong Hong, Youwei Xu, Lingling Chen, Jinsheng Hu, Baoye CAS Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Key Lab of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China College of Resources and Environment Fujian Agriculture and Forest University Fuzhou350002 China College of Resources and Environment University of Chinese Academy of Sciences Beijing100086 China Fujian Provincial Key Laboratory of Pollution Monitoring and Control Minnan Normal University Zhangzhou363000 China

New particle formation (NPF) has a great impact on regional and global climate, air quality and human health. This study uses a Scanning Mobility Particle Sizer (SMPS) for simultaneous measurement of particle number size distribution (PNSD) in wintertime to investigate NPF in the coastal city of Xiamen. The mean particle number concentration, surface area concentration and volume concentration were 7.25 × 103 cm−3, 152.54 μm2 cm−3, and 4.03 μm3 cm−3, respectively. Particle number concentration was mainly influenced by the nucleation mode and the Aitken mode, whereas the main contributor to particle surface area concentration and volume concentration was accumulation mode particles. The frequency of NPF events occurred was around 41.4% in December 2019. The typical growth rates of new formed particles were 1.41–2.54 nm h−1, and the observed formation rates were 0.49–1.43 cm−3 s−1. A comparative analysis of conditions between event and non-event days was performed. The results emphasized that air temperature, UV radiation and relative humidity were the most decisive meteorological factors, and NPF events usually occurred under clean atmospheric conditions with low PM concentrations. Although condensation sink was high when NPF event occurred, the level of SO2 and O3 concentration was also high. © 2022

关键词： Air quality

A comprehensive analysis of O₃ variation and source contributions of VOCs-oriented to O₃ pollution episodes over Jinan city, China

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atmospheric pollution Research 2025年第8期16卷

作者： Fan, Lianhuan Gu, Shumao Yan, Huaizhong Zhang, Junxiao Zhang, Miao Wei, Xiaofeng Zhang, Guiqin Key Laboratory of Beijing on Regional Air Pollution Control College of Environmental Science and Engineering Beijing University of Technology Beijing China School of Municipal and Environmental Engineering Shandong Jianzhu University Shandong Jinan China Shandong Provincial Eco-environment Monitoring Center Shandong Jinan China

Although severe ozone (O3) pollution has been frequently observed during summer over Jinan city in northern China, which underscores the necessity of mitigating O3 pollution, the key formation processes and prominent ... 详细信息

Although severe ozone (O₃) pollution has been frequently observed during summer over Jinan city in northern China, which underscores the necessity of mitigating O₃ pollution, the key formation processes and prominent sources of O₃ pollution episode remain poorly characterized. In this study, the Weather Research and Forecasting (WRF)-Community Multiscale Air Quality (CMAQ) modeling system was employed to investigate the formation mechanism of O₃ pollution during summer in Jinan. In addition, the Integrated Source Apportionment Method (ISAM) was subsequently applied to determine the major VOCs contributors to elevated O₃ levels. During O₃ pollution episodes, increased O₃ concentrations generated by gas-chemistry at high altitudes were transported to the ground through vertical transport, exacerbating surface-level O₃ pollution caused by photochemical reactions during daytime. The declined height of the planetary boundary layer (PBLH) and vertical mixing, which form O₃-rich residual layers, were identified as the key drivers of the O₃ accumulation and enhancement near the surface during nighttime. Furthermore, ISAM results indicate that terminal olefin carbon bonds (OLE), internal olefin carbon bonds (IOLE), and ethene (ETH) playing essential roles in O₃ formation, collectively contributing up to 60 %. This implicates great importance of vehicle exhaust and the use of liquefied petroleum gas (LPG) and natural gas (NG) over Jinan city. Our findings offer possible explanations for O₃ pollution episode and provide a quantitative understanding of O₃ source apportionment, guiding the control strategy of VOCs-oriented on O₃ mitigation. © 2025 Turkish National Committee for Air pollution Research and control

关键词： Active VOCs contributions CMAQ-ISAM model Formation process analysis Ozone pollution characteristics Source apportionment

An Acid Rain–Friendly Nh3 control Strategy to Maximize Benefits Toward Human Health and the Ecosystem

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SSRN 2022年

作者： Dong, Zhaoxin Wang, Shuxiao Jiang, Yueqi Xing, Jia Ding, Dian Zheng, Haotian Hao, Jiming State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing100084 China Institute for Atmospheric and Earth System Research/Physics Faculty of Science University of Helsinki Helsinki00014 Finland

Ammonia (NH3) abatement remains controversial in China owing to its effectiveness in reducing PM2.5 pollution and nitrogen deposition but with the potential risk of promoting acid rain formation, necessitating scientific guidance. Here, we propose a novel method for designing an NH3 control strategy to mitigate both air pollution and nitrogen deposition without significantly exacerbating acid rain. This method involves extending the response surface model (RSM) to deposition using a delicately developed polynomial response function of deposition (i.e., dep-RSM). The Yangtze River Delta (YRD) dep-RSM application reveals that 16 out of 41 cities have NH3 control potentials from 15% to 71%. Excellent NH3 control potentials have been noted between April and June (78%–92%). From 2013 to 2017, the effective SO2 and NOx control significantly reduced wet sulfur and oxidized nitrogen deposition, providing considerable NH3 abatement potentials (15%–24%) to further reduce PM2.5 and nitrogen deposition by up to 2% and 9%, respectively, without acid rain exacerbation (the wet neutralization factor was maintained). Additionally, 57% and 73% NH3 emission reduction potentials were obtained under acid rain constraints with 75% and 86% reductions in the other precursors to reduce the average PM2.5 concentration below 25 and 15 µg/m3, and an additional 8408 and 14459 premature deaths could only be avoided at an extra cost of 8.7 and 19.7 billion CNY, respectively. Meanwhile, the N deposition considerably reduced by 10 and 13 kgN/ha·yr. However, the YRD region could still simultaneously obtain substantial amounts of PM2.5 and N deposition mitigation using the strategy proposed herein. The expanded optimization system can be directly adopted by policymakers to implement coordinated control in regions or countries facing the same NH3 control conundrum. © 2022, The Authors. All rights reserved.

关键词： Ammonia

Niche differentiation of anammox genera with sludge blanket expansion in anammox expanded granular sludge bed induced by short hydraulic retention time condition

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Bioresource Technology 2025年 132827页

作者： Xin Wang Yijing Zhu Changqing Liu Antao Yao Yihao Tian Xiaofeng Zhu Jianghua Yu Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing 210044 PR China

This study explored the influencing mechanism for key parameters of hydraulic retention time (HRT) and upflow velocity on the anammox sludge blanket characteristics and functional microbial communities in an anammox expanded granular sludge bed. Shortening HRT from 8 h to 4 h improved nitrogen removal and expanded the effective working zone from 36.9 % to 60.0 %, promoting Candidatus Brocadia dominance, which outcompeted Candidatus Kuenenia and Candidatus Jettenia under elevated dissolved oxygen and substrate levels due to its oxygen detoxification capacity. Increasing upflow velocity also enhanced nitrogen removal by expanding the working zone. Nevertheless, excessive upflow velocity (12 m/h) caused anammox granule fragmentation and biomass loss. These findings demonstrate that effective working zone expansion under short HRTs enhances nitrogen removal, driving niche differentiation among anammox genera, ultimately shaping the microbial community structure and spatial stratification critical for efficient anammox performance.

关键词： Anaerobic ammonia oxidation Expanded granular sludge bed Hydraulic retention time Microbial communities Spatial characteristics

Promoting Effects of Iron Ions on Microcystis Aeruginosa Growth and Arsenate Accumulation and Reduction at Different Phosphorus Sources

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SSRN 2024年

作者： Wang, Zhenhong Zeng, Lingjun Luo, Zhuanxi Wang, Yan Hao, Chunming College of Chemistry Chemical Engineering and Environment Minnan Normal University Key Laboratory of Modern Separation and Analysis Science and Technology Key Laboratory of Pollution Monitoring and Control Zhangzhou363000 China College of Chemical Engineering Huaqiao University Xiamen361021 China School of Mathematics and Statistics Minnan Normal University Zhangzhou363000 China North China Institute of Science and Technology Hebei Sanhe065201 China

Effects of different dissolved organic phosphorus (DOP) associated with iron sources on algal growth and arsenate (As(V)) metabolism were evaluated and compared systematically in Microcystis aeruginosa. Results showed that the difference in phosphorus sources including two forms DOP of D-glucose-6-phosphate (GP) and phytic acid (PA)) and even the control of dissolved inorganic phosphorus (DIP) had more significant effects on As(V) metabolism than that of iron sources, including iron deficient, iron ion (Fe3+), and colloidal iron. Meanwhile, the release of microcystins in media was significantly more affected by the different phosphorus sources than iron. Furthermore, DOP facilitated arsenic (As) biotransformation, especially for the methylated As efflux from a single algal cell, while in DIP, As(V) accumulation was as the primary metabolic way in algae. The total As metabolism amount per algal cell under PA was five times that of DIP and GP. From the observed metabolites in algae from 1H-NMR spectra and three-dimensional fluorescence analysis (3D-EEM), the impact of iron sources on the production of algal metabolites was substantial, especially at Fe3+ conditions, which notably enhanced the synthesis of organic compounds in algae. Accordingly, iron ions could inhibit As accumulation under DIP but promote it under DOP. The obtained results can better understand the combined role of different phosphorus and iron sources in algal bloom outbreaks and As(V) metabolism. © 2024, The Authors. All rights reserved.

关键词： Iron

Frontier of CO_(2)capture and conversion towards carbon neutrality

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Journal of environmental Sciences 2024年第6期140卷 1-1页

作者： Tsunehiro Tanaka Qiang Wang Min Liu Zheng Wang Tomas Ramirez Reina Department of Molecular Engineering Graduate School of EngineeringKyoto UniversityKyoto 6158510Japan College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083China State Key Laboratory of Powder Metallurgy School of Physical and ElectronicsCentral South UniversityChangsha 410083China Laboratory of Atmospheric Environment and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Department of Chemical and Process Engineering Department University of SurreyGuildford GU27XHUnited Kingdom

With the rapid development of human civilization,the concentration of CO_(2)in the atmosphere has sharply increased in the past century,resulting in global temperature anomaly,extreme climate events,and eco-environmen... 详细信息

关键词： anomaly neutral sharply

Analysis of the migration mechanisms of tire wear Particles in quartz sand: Insights into aging pathways and pH regulation effects

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Journal of environmental Chemical Engineering 2025年第3期13卷

作者： Jianghua Yu Chi Liu Zhangle Chen Zidong Ye Kun Li Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology China School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing 210044 China

As a pivotal source of non-exhaust microplastic pollution in the automotive industry, tire wear particles (TWPs) remain an area of research in its infancy regarding their migration mechanisms and environmental influences. This study delves into the migration characteristics of TWPs within saturated quartz sand media, with a particular emphasis on the regulatory effects of diverse aging scenarios—encompassing pure water, lake water, bacterial mixtures, and simulated soil solutions—alongside pH fluctuations. Our findings unveil that the aging process profoundly reshapes the physicochemical properties of TWPs, encompassing surface morphology, elemental composition, crystal structure, functional group characteristics, as well as surface potential and wettability. Notably, TWPs aged in a mixed bacterial solution (M-TWPs) exhibit a dramatic increase in specific surface area, ranging from 59 to 2038 times that of their unaged counterparts (U-TWPs). Consequently, the maximum penetration ratio of M-TWPs at neutral pH (7.0) soars to 0.89, marking a 2.4-fold enhancement compared to U-TWPs (0.37). This results from bacterial attachment and metabolites roughen TWPs' surface, cause fractures, enhance charge, and increase hydrophilicity, boosting migration. Crucially, pH governs TWPs' migration by modulating surface charges and electrostatic interactions with quartz sand. Alkaline conditions (pH=10) reduce electrostatic adsorption, increasing migration efficiency, while acidic environments (pH=4) enhance adsorption, decreasing migration. Additionally, material exchange during migration subtly affects filtrate pH and redox potential, highlighting the complexity of TWPs' environmental interactions. Our findings deepen the understanding of TWPs' environmental behavior and provide a foundation for assessing their migration paths and ecological effects, informing future research and risk management strategies.

关键词：

Exploring the Rate-control Step of Toluene Oxidation Over the Novel Octahedral Pt/Mn3o4 Catalyst with Stable Low-Temperature Catalytic Performance Via in Situ Drifts

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SSRN 2024年

作者： Fan, Jie Mao, Lutao Fu, Mingli Liu, Peng Wu, Zuliang Ye, Daiqi School of Environment and Resources Taiyuan University of Science and Technology Taiyuan030024 China Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control School of Environment and Energy South China University of Technology Guangzhou510006 China School of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan030024 China Advanced Plasma Catalysis Engineering Laboratory for China Petrochemical Industry School of Environmental and Safety Engineering Changzhou University Jiangsu213164 China

The high efficiency and stability of catalysts are crucial for their practical application in toluene oxidation. Herein, a novel octahedral Pt/Mn3O4-110 catalyst with excellent structural stability was synthesized and 100% toluene conversion can be achieved at low-temperature 160 ºC. XRD and Raman results indicated that the structure of Pt/Mn3O4-110 can be well maintained after 120 h on-stream reaction, the resistance to H2O (3 or 5 vol.%) and high concentration toluene (3000 ppm)/CO2 (5 vol.%) tests. In situ DRIFTS comparative studies between Pt/Mn3O4-110 and Pt/Mn3O4-100 (30% toluene conversion at 160 ºC) samples demonstrated that the rate-control steps of toluene oxidation on Pt/Mn3O4-110 and Pt/Mn3O4-100 were both the further oxidation of benzoate species in the presence of gas-phase oxygen, while the transformation of benzaldehyde to benzoate species was the rate-control step on Pt/Mn3O4-100 in the absence of gas-phase oxygen. The weaker Mn-O bonds, richer oxygen vacancies and higher mobility of oxygen species on Pt/Mn3O4-110 sample than that of Pt/Mn3O4-100 are beneficial for the easier release of lattice oxygen from the surface of catalyst and then participated in toluene oxidation via Mars-van Krevelen mechanism, contributing to easier oxidation of benzaldehyde to benzoate species and formation of formic acid and bicarbonate species. © 2024, The Authors. All rights reserved.

关键词： Catalytic oxidation

Decontamination Promotes the Release of Incorporated Organic Pollutants in Hair: Novel Insights into Non-Invasive Biomonitoring

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SSRN 2024年

作者： Qin, Rui-Xin Cao, Xue Zhang, Shi-Yi Li, Hong Tang, Bin Liao, Qi-Long Cai, Feng-Shan Peng, Xian-Zhi Zheng, Jing State Key Laboratory of Organic Geochemistry Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment Research Center of Emerging Contaminants South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510655 China The Key Laboratory of Environmental Pollution Monitoring and Disease Control Ministry of Education School of Public Health and Wellness Guizhou Medical University Guiyang550025 China University of Chinese Academy of Sciences Beijing100049 China

Human hair is increasingly employed as a non-invasive biomonitoring matrix for assessing exposure to organic pollutants (OPs). Decontamination procedures are commonly used to remove external contamination from hair prior to analysis. Despite numerous washing protocols, influence of decontamination on internally incorporated (endogenous) OPs in hair remains poorly understood. This study aims to quantitatively assess the impact of decontamination procedures on endogenous OPs in hair, identify optimal decontamination process and elucidate the key factors that influence endogenous OP removal. Six decontamination procedures (washed by methanol, n-hexane, acetone, ultrapure water, Triton X-100, and sodium dodecyl sulfate) were used to rinse guinea pig hair contaminated with six OPs (triphenyl phosphate (TPHP), tris(1,3-dichloro-2-propyl) phosphate (TDCPP), and tri-n-butyl phosphate (TNBP), bisphenol A (BPA), perfluorooctanoic acid (PFOA), and phenanthrene (PHE)). The OPs and their three OP metabolites (diphenyl phosphate (DPHP), dibutyl phosphate (DBP), and bis(1,3-dichloro-2-propyl) phosphate (BDCPP)) were identified in most wash solutions, indicating release of endogenous OPs from hair caused by the washing procedures. Percentages of the residual OPs in hair exhibited a linear or exponential decrease with an increase in washing times. Rinsing with acetone or water for one single cycle seemed optimal procedure due to lower removal. Furthermore, we investigated roles of lipophilicity, molecular weight, polarizability, hair concentration, and washing cycles. Our results showed that OPs with lower concentrations and molecular weights tended to persist in the hair matrix, while polar OPs were more vulnerable to the washing processes. These findings provided compelling evidence that current hair decontamination procedures had significant impacts on analysis of endogenous OPs in hair. Therefore, it is important to interpret quantitative data on hair OP concentrations with caut

关键词： Sulfur compounds