Environmental science: atmospheres最新文献_第9页

Toxicological evaluation of SVOCs in exhaust emissions from light-duty vehicles using different fuel alternatives under sub-freezing conditions† 亚冰冻条件下使用不同燃料替代品的轻型汽车尾气排放中 SVOC 的毒理学评估†。

IF 2.8

Environmental science: atmospheres Pub Date : 2024-10-10 DOI: 10.1039/D4EA00062E

Mo Yang, Päivi Aakko-Saksa, Henri Hakkarainen, Topi Rönkkö, Päivi Koponen, Xiao-Wen Zeng, Guang-Hui Dong and Pasi I. Jalava

{"title":"Toxicological evaluation of SVOCs in exhaust emissions from light-duty vehicles using different fuel alternatives under sub-freezing conditions†","authors":"Mo Yang, Päivi Aakko-Saksa, Henri Hakkarainen, Topi Rönkkö, Päivi Koponen, Xiao-Wen Zeng, Guang-Hui Dong and Pasi I. Jalava","doi":"10.1039/D4EA00062E","DOIUrl":"https://doi.org/10.1039/D4EA00062E","url":null,"abstract":"Semivolatile organic compounds (SVOCs) in exhaust gas, though not directly regulated by emission standards, play a crucial role in assessing both conventional and alternative fuels. Our aim is to compare the differences in and toxicological effects of SVOC exhaust emissions from conventional and alternative fuels under sub-freezing conditions. High levels of NOx, CO2 and PAHs in SVOCs were observed in DI-E2 (EN590 winter-grade diesel), with E10 (gasoline with 10% ethanol) exhibiting higher CO2 and PAH levels compared to E85 (high-blend ethanol with an 83/17% ethanol–gasoline ratio). SVOCs from DI-E6 (EN590 diesel) demonstrated significant cytotoxicity, while E10 resulted in higher inflammatory mediators and genotoxicity. Our findings show that SVOC composition and toxicity in exhaust gas differ based on the fuel type. Despite new emissions regulations reducing diesel vehicle emissions, SVOC toxicity remains unchanged. Toxicity from SVOCs in compressed natural gas and ethanol/gasoline vehicles is notable, with gasoline exhaust showing high inflammatory and genotoxic potential.","PeriodicalId":72942,"journal":{"name":"Environmental science: atmospheres","volume":" 11","pages":" 1255-1265"},"PeriodicalIF":2.8,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ea/d4ea00062e?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Trace elements in PM2.5 shed light on Saharan dust incursions over the Munich airshed in spring 2022† PM2.5 中的痕量元素揭示了 2022 年春季撒哈拉沙尘入侵慕尼黑上空的情况†。

IF 2.8

Environmental science: atmospheres Pub Date : 2024-10-08 DOI: 10.1039/D4EA00092G

Sara Padoan, Alessandro Zappi, Jan Bendl, Tanja Herrmann, Ajit Mudan, Carsten Neukirchen, Erika Brattich, Laura Tositti and Thomas Adam

{"title":"Trace elements in PM2.5 shed light on Saharan dust incursions over the Munich airshed in spring 2022†","authors":"Sara Padoan, Alessandro Zappi, Jan Bendl, Tanja Herrmann, Ajit Mudan, Carsten Neukirchen, Erika Brattich, Laura Tositti and Thomas Adam","doi":"10.1039/D4EA00092G","DOIUrl":"https://doi.org/10.1039/D4EA00092G","url":null,"abstract":"The influence of a prolonged Saharan Dust event across Europe and specifically in Munich (Germany) in March 2022 was detected and analyzed in detail. The event arose from a sequence of Saharan Dust incursions intertwined with a stagnation in the regional circulation leading to the persistence of a mineral dust plume for several weeks over the region. Trace element and meteorological data were collected. Enrichment factors, size distribution analyses, and multivariate techniques such as Varimax and Self-Organizing Maps (SOM) were applied to highlight the influence of Saharan Dusts and to evaluate the pollution sources in Munich municipality. The overall results revealed how the Munich airshed was clearly affected by long-distance mineral dusts from the North African desert, that increased the concentrations of natural (e.g. Al, Mg, Ca) and anthropogenic (e.g. Sb, Mo, Pb) elements based on the different paths followed by the dusts. Moreover, the chemometric analyses revealed a range of well-defined local anthropogenic emission sources including road traffic, energy production by coal combustion (S and Se), traffic (Cu, Sb), and waste incineration (Zn).","PeriodicalId":72942,"journal":{"name":"Environmental science: atmospheres","volume":" 11","pages":" 1266-1282"},"PeriodicalIF":2.8,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ea/d4ea00092g?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluating emissions and meteorological contributions to air quality trends in northern China based on measurements at a regional background station† 基于区域本底站的测量结果，评估排放和气象对中国北方空气质量趋势的影响†。

IF 2.8

Environmental science: atmospheres Pub Date : 2024-10-08 DOI: 10.1039/D4EA00070F

Weiwei Pu, Yingruo Li, Xiaowan Zhu, Xiangxue Liu, Di He, Fan Dong, Heng Guo, Guijie Zhao, Liyan Zhou, Shuangshuang Ge and Zhiqiang Ma

{"title":"Evaluating emissions and meteorological contributions to air quality trends in northern China based on measurements at a regional background station†","authors":"Weiwei Pu, Yingruo Li, Xiaowan Zhu, Xiangxue Liu, Di He, Fan Dong, Heng Guo, Guijie Zhao, Liyan Zhou, Shuangshuang Ge and Zhiqiang Ma","doi":"10.1039/D4EA00070F","DOIUrl":"https://doi.org/10.1039/D4EA00070F","url":null,"abstract":"The contributions of meteorology and emissions to air pollutant trends are critical for air quality management, but they have not been fully analyzed, especially in the background area of northern China. Here, we used a machine learning technique to quantify the impacts of meteorological conditions and emissions on PM2.5, NO2, SO2, O3, and CO pollution during 2013–2021 and evaluated their contributions to Clean Air Action policies. The annual effect of the meteorology on PM2.5, NO2, SO2, and CO levels was dominated by the meteorological conditions during the cold season, while that of the O3 level largely depended on the meteorological conditions during the warm season. Meteorology-driven anomalies contributed −14.8 to 10.3%, −8.5 to 7.3%, −11 to 7.1%, −7.9 to 6.0%, and −7.4 to 7.3% to the annual mean concentrations of PM2.5, NO2, SO2, O3, and CO during the study period, respectively. The Clean Air Actions have led to a major improvement in the air quality at regional scale, with the reduction of 1.7 μg m−3 year−1, 0.2 μg m−3 year−1, 1.5 μg m−3 year−1, 0.7 μg m−3 year−1, and 0.03 mg m−3 year−1 for PM2.5, NO2, SO2, O3, and CO at background area, respectively, after meteorological correction. Although emissions dominated the long-term variations in pollutants, the meteorological conditions obviously played a positive role during the action periods for pollutants except for O3. Considering the notable effects of the meteorological conditions on air pollution and the interreaction between pollutants, a more comprehensive control strategy should be considered on a broader regional scale.","PeriodicalId":72942,"journal":{"name":"Environmental science: atmospheres","volume":" 11","pages":" 1283-1293"},"PeriodicalIF":2.8,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ea/d4ea00070f?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of mass concentrations of airborne PET microplastics using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS)† 使用液相色谱耦合串联质谱法（LC-MS/MS）†测定空气中PET微塑料的质量浓度

IF 2.8

Environmental science: atmospheres Pub Date : 2024-10-04 DOI: 10.1039/D4EA00047A

Durga Prasad Patnana and B. P. Chandra

{"title":"Determination of mass concentrations of airborne PET microplastics using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS)†","authors":"Durga Prasad Patnana and B. P. Chandra","doi":"10.1039/D4EA00047A","DOIUrl":"https://doi.org/10.1039/D4EA00047A","url":null,"abstract":"Microplastics (MPs) have recently become a growing environmental pollution concern. MPs are easily transferred and ubiquitously found in ambient air. MPs in the air can act as carriers for several toxic pollutants, and exposure to MPs can lead to pulmonary diseases in humans. Polyethylene terephthalate (PET) is one of the most abundant MPs used in the manufacturing of various fibres and plastics. In this study, we present a method for the determination of mass concentrations of PET MPs in the airborne inhalable fraction of fine particulate matter (PM2.5) using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). Teflon and quartz fiber filters were tested for extraction efficiency in measuring the mass concentrations of airborne PET MPs. Teflon filters showed good recovery (80–120%) compared to quartz fiber filters. Using this method, a pilot study was carried out in Delhi, the national capital of India, and Mohali, a suburban city in the northwest Indo-Gangetic Plain (NWIGP), for the determination of mass concentrations of PET MPs present in airborne PM2.5. The observed maximum mass concentrations of PET MPs in airborne PM2.5 in Delhi and Mohali are 135.20 ng m−3 and 157.98 ng m−3, respectively.","PeriodicalId":72942,"journal":{"name":"Environmental science: atmospheres","volume":" 12","pages":" 1352-1357"},"PeriodicalIF":2.8,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ea/d4ea00047a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142778036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kinetics of the reactions of the Criegee intermediate CH2OO with water vapour: experimental measurements as a function of temperature and global atmospheric modelling† 克里基中间体 CH2OO 与水蒸气反应的动力学：作为温度函数的实验测量结果和全球大气模型†。

IF 2.8

Environmental science: atmospheres Pub Date : 2024-09-30 DOI: 10.1039/D4EA00097H

Rachel E. Lade, Mark A. Blitz, Matthew Rowlinson, Mathew J. Evans, Paul W. Seakins and Daniel Stone

{"title":"Kinetics of the reactions of the Criegee intermediate CH2OO with water vapour: experimental measurements as a function of temperature and global atmospheric modelling†","authors":"Rachel E. Lade, Mark A. Blitz, Matthew Rowlinson, Mathew J. Evans, Paul W. Seakins and Daniel Stone","doi":"10.1039/D4EA00097H","DOIUrl":"https://doi.org/10.1039/D4EA00097H","url":null,"abstract":"The kinetics of reactions between the simplest Criegee intermediate, CH2OO, and water vapour have been investigated at temperatures between 262 and 353 K at a total pressure of 760 Torr using laser flash photolysis of CH2I2–O2–N2–H2O mixtures coupled with broadband time-resolved UV absorption spectroscopy. Results indicate that the reaction with water monomers represents a minor contribution to the total loss of CH2OO under the conditions employed in this work, with an estimated rate coefficient for CH2OO + H2O (R1) of (9.8 ± 5.9) × 10−17 cm3 molecule−1 s−1 at 298 K and a temperature dependence described by k1 = (3.2 ± 1.1) × 10−13 exp(−(2410 ± 270)/T) cm3 molecule−1 s−1. The reaction of CH2OO with water dimers, CH2OO + (H2O)2 (R2), dominates under the conditions employed in this work. The rate coefficient for R2 has been measured to be k2 = (9.5 ± 2.5) × 10−12 cm3 molecule−1 s−1 at 298 K, with a negative temperature dependence described by k2 = (2.85 ± 0.40) × 10−15 exp((2420 ± 340)/T) cm3 molecule−1 s−1, where rateR2 = k2[CH2OO][(H2O)2]. For use in atmospheric models, we recommend description of the kinetics for R2 in terms of the product of the rate coefficient k2 and the equilibrium constant KDeq (k2,eff = k2KDeq) for water dimer formation to allow the rate of reaction to be expressed in terms of water monomer concentration as rateR2 = k2,eff[CH2OO][H2O]2 to avoid explicit calculation of dimer concentrations and impacts of differences in values of KDeq reported in the literature. Results from this work give k<small","PeriodicalId":72942,"journal":{"name":"Environmental science: atmospheres","volume":" 11","pages":" 1294-1308"},"PeriodicalIF":2.8,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ea/d4ea00097h?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Immersion ice nucleation of atmospherically relevant lipid particles† 与大气相关的脂质颗粒的浸入式冰核形成†。

IF 2.8

Environmental science: atmospheres Pub Date : 2024-09-25 DOI: 10.1039/D4EA00066H

Lincoln Mehndiratta, Audrey E. Lyp, Jonathan H. Slade and Vicki H. Grassian

{"title":"Immersion ice nucleation of atmospherically relevant lipid particles†","authors":"Lincoln Mehndiratta, Audrey E. Lyp, Jonathan H. Slade and Vicki H. Grassian","doi":"10.1039/D4EA00066H","DOIUrl":"https://doi.org/10.1039/D4EA00066H","url":null,"abstract":"Ice nucleating particles (INPs) play a crucial role in freezing water droplets by acting as heterogeneous ice nuclei, influencing cloud phase state and climate dynamics. INPs from marine aerosol particles are particularly relevant. Saturated fatty alcohols and acids have been identified in sea spray aerosols (SSA). In this study, we employ a micro-Raman spectrometer integrated with an environmental cell to control relative humidity and temperature and measure the ice nucleation activity of individual lipid particles, including fatty alcohols and fatty acids of varying chain lengths. For fatty acids, we observe little IN activity for these lipid particles as they freeze close to the temperature found for homogeneous freezing. For fatty alcohols, we demonstrate that freezing temperatures depend on the carbon chain length, with longer chains leading to warmer ice nucleating temperatures. Although this result qualitatively agrees with existing literature, we observe that the ice nucleating temperatures of these lipid particles differ from the freezing temperatures measured for fatty alcohol monolayers at the air/water interface for large water droplets. To better understand these differences, we further investigate the effects of droplet size as well as phase state by theoretically determining the wet viscosity on freezing. Our results, taken together, suggest that for fatty alcohol particles, freezing occurs at the lipid particle/water interface. Overall, our findings highlight the influence of lipid chain length, droplet size, and phase state on ice nucleation for lipid particles.","PeriodicalId":72942,"journal":{"name":"Environmental science: atmospheres","volume":" 11","pages":" 1239-1254"},"PeriodicalIF":2.8,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ea/d4ea00066h?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Particle number size distribution evaluation of Plantower PMS5003 low-cost PM sensors – a field experiment† Plantower PMS5003 低成本可吸入颗粒物传感器的粒度分布评估--现场实验†。

IF 2.8

Environmental science: atmospheres Pub Date : 2024-09-24 DOI: 10.1039/D4EA00086B

Alexandre Caseiro, Seán Schmitz and Erika von Schneidemesser

{"title":"Particle number size distribution evaluation of Plantower PMS5003 low-cost PM sensors – a field experiment†","authors":"Alexandre Caseiro, Seán Schmitz and Erika von Schneidemesser","doi":"10.1039/D4EA00086B","DOIUrl":"https://doi.org/10.1039/D4EA00086B","url":null,"abstract":"The use of low-cost sensors (LCS) for the evaluation of the ambient pollution by particulate matter (PM) has grown and become significant for the scientific community in the past few years. However promising this novel technology is, the characterization of their limitations is still not satisfactory. Reports in the scientific literature rely on calibration, which implies the physical (or geographical) co-location of the LCS with reference in situ (or remote, e.g. onboard satellite platforms) instrumentation. However, calibration is not always feasible, and even when feasible, the validity of the developed relationship, even in similar settings, is subject to large uncertainties. In the present work, the performance of a popular LCS for PM, the Plantower PMS5003, is investigated. The LCS performs particle counts, which is the physical quantity that is input to the black-box model of the manufacturer to compute the ambient PM mass, which is output to the operator. The particle counts of LCS Plantower PMS5003 units were compared to those of the co-located research-grade Grimm EDM-164 monitor. The results show that humidity possibly has a reduced influence on the performance, but the performance can better be constrained, however spanning more than one order of magnitude in terms of agreement ratio, by functions of the actual particle count itself. In view of these results, further development in the field of LCS for PM monitoring should focus on improvements of the physical design of the devices, in order to enhance the sizing of the particles. The use of the actual Plantower PMS5003 models should be limited to the monitoring of PM mass in the smaller size bins.","PeriodicalId":72942,"journal":{"name":"Environmental science: atmospheres","volume":" 10","pages":" 1183-1194"},"PeriodicalIF":2.8,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ea/d4ea00086b?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ozone formation potential related to the release of volatile organic compounds (VOCs) and nitrogen oxide (NOX) from a typical industrial park in the Pearl River Delta† 与珠江三角洲典型工业园区释放的挥发性有机化合物（VOCs）和氮氧化物（NOX）有关的臭氧形成潜力†。

IF 2.8

Environmental science: atmospheres Pub Date : 2024-09-20 DOI: 10.1039/D4EA00091A

Taicheng An, Jiajia Li, Qinhao Lin and Guiying Li

{"title":"Ozone formation potential related to the release of volatile organic compounds (VOCs) and nitrogen oxide (NOX) from a typical industrial park in the Pearl River Delta†","authors":"Taicheng An, Jiajia Li, Qinhao Lin and Guiying Li","doi":"10.1039/D4EA00091A","DOIUrl":"https://doi.org/10.1039/D4EA00091A","url":null,"abstract":"Ozone (O3) pollution has been recognized as the major air pollution in the Pearl River Delta (PRD) region, South China. Understanding O3 formation sensitive to volatile organic compound (VOC)- and nitrogen oxide (NOX)-limited regimes is a key step for alleviating O3 pollution. Herein, measurements of VOCs, NOX and O3 were simultaneously performed at multi sampling sites in an industrial park of the PRD region during June, 2020. VOCs/NOX ratios ranged from 0.5 to 5.7, suggesting that the O3 formation was in the VOC-limited regime in the industrial park. The estimated O3 formation potential (OFP) of VOCs showed that alkenes and aromatic hydrocarbons from motor vehicles and industrial sources contributed to 40% and 39% of the O3 formation, respectively, in the industrial park. However, a low O3 level (<50 ppb) was observed in the region where high OFP values (>194 ppb) were estimated. Further analysis found that the concentration of NOx (25 ± 10 ppb) in the high O3 region was lower than that (36 ± 6 ppb) in the low O3 region, mostly due to the titration reaction of NO and O3 to form NO2, therefore leading to the consumption of O3. This result implies that NOX control was not conducive to the O3 pollution in the study region. Thus, O3 pollution control in the study region should be taken into consideration in terms of the effect of NOX titration and control of VOC emissions.","PeriodicalId":72942,"journal":{"name":"Environmental science: atmospheres","volume":" 11","pages":" 1229-1238"},"PeriodicalIF":2.8,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ea/d4ea00091a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of atmospheric water-soluble iron on α-pinene-derived SOA formation and transformation in the presence of aqueous droplets† 大气中的水溶性铁对α-蒎烯衍生的 SOA 在水滴存在下的形成和转化的影响†。

IF 2.8

Environmental science: atmospheres Pub Date : 2024-09-14 DOI: 10.1039/D4EA00095A

Sabine Lüchtrath, Sven Klemer, Clément Dubois, Christian George and Andreas Held

{"title":"Impact of atmospheric water-soluble iron on α-pinene-derived SOA formation and transformation in the presence of aqueous droplets†","authors":"Sabine Lüchtrath, Sven Klemer, Clément Dubois, Christian George and Andreas Held","doi":"10.1039/D4EA00095A","DOIUrl":"https://doi.org/10.1039/D4EA00095A","url":null,"abstract":"The impact of water-soluble atmospheric iron on formation, growth and aging of secondary organic aerosol (SOA) is a controversial subject in the literature. Iron chemistry drives Fenton reactions in the aqueous phase which is dependent on pH. Flow reactor experiments in the dark and under humid conditions were conducted to investigate systematically the influence of ferrous iron in the aqueous phase on α-pinene SOA by online physical analysis and offline high-resolution mass spectrometry. During the experiments increased SOA formation under conditions favorable for dark Fenton chemistry in the aqueous phase was observed. Furthermore, samples with an acidified and iron-containing aqueous phase showed a degradation of pinyl-diaterpenyl (C17H26O8) ester which ages through oxidation via OH radicals and can thus be evidence for ongoing degradation processes of high molecular weight molecules by iron chemistry. Moreover, higher abundance of dimer MW338 (C19H30O5) in the acidic sample affected by Fenton's chemistry was detected which is suggested to be formed via acid catalysis indicating competing acidity-driven reactions influencing SOA formation. Therefore, this study provides insight into the impact of aqueous phase iron on SOA formation and transformation under simulated natural conditions.","PeriodicalId":72942,"journal":{"name":"Environmental science: atmospheres","volume":" 11","pages":" 1218-1228"},"PeriodicalIF":2.8,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ea/d4ea00095a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of atmospheric microplastics in Hangzhou, a megacity of the Yangtze river delta, China† 中国长江三角洲特大城市杭州大气中微塑料的特征†。

IF 2.8

Environmental science: atmospheres Pub Date : 2024-08-23 DOI: 10.1039/D4EA00069B

Liang Xu, Jiefeng Li, Shushen Yang, Zhenyang Li, Yan Liu, Yifan Zhao, Dantong Liu, Admir Créso Targino, Zhonghua Zheng, Mingzhou Yu, Peng Xu, Yele Sun and Weijun Li

{"title":"Characterization of atmospheric microplastics in Hangzhou, a megacity of the Yangtze river delta, China†","authors":"Liang Xu, Jiefeng Li, Shushen Yang, Zhenyang Li, Yan Liu, Yifan Zhao, Dantong Liu, Admir Créso Targino, Zhonghua Zheng, Mingzhou Yu, Peng Xu, Yele Sun and Weijun Li","doi":"10.1039/D4EA00069B","DOIUrl":"https://doi.org/10.1039/D4EA00069B","url":null,"abstract":"Microplastics (MPs) have become a key environmental issue over the last few decades. However, while previous studies have mainly focused on aquatic MP pollution, research on atmospheric MPs remains limited. To expand our knowledge of atmospheric MPs, we collected atmospheric samples using active and dry deposition techniques during one year in an urban environment in the megacity of Hangzhou, China. MPs were identified in the samples using a range of analytical and optical techniques. The concentrations of MPs on the filters collected using active sampling ranged from 0.37–8.9 particles per m3, with an annual mean of 3.2 ± 0.5 particles per m3. The dry deposition rate of atmospheric MPs ranged from 441.18–3181.8 particles per m2 per day, with an annual mean of 1387.8 ± 237.7 particles per m2 per day. Fiber MPs were the most predominant type while a few film-type MPs were identified. Raman microspectrometer analysis identified that tires (27.0% of MPs) and polyethylene terephthalate (PET, 19.7% of MPs) were the dominant MP types. Finally, we estimated that the annual dry deposition rate of MPs in the Hangzhou urban area was 16.9 ± 2.9 tons. Exploring the abundance and deposition of MPs helps to evaluate their potential threat to human health or aquatic ecology, which finally contributes to development of MP control measures.","PeriodicalId":72942,"journal":{"name":"Environmental science: atmospheres","volume":" 10","pages":" 1161-1169"},"PeriodicalIF":2.8,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ea/d4ea00069b?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0