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Identification of secondary organic aerosols based on aerosol mass spectrometry

中国科学：化学英文版 2010年第12期53卷 2593-2599页

作者： HUANG XiaoFeng 1,ZHAO QianBiao 1,2,HE LingYan 1,HU Min 2,BIAN QiJing 3,XUE Lian 1 & ZHANG YuanHang 2 1 key laboratory for Urban Habitat environmental Science and Technology school of environment and energy,peking university shenzhen graduate school,shenzhen 518055,china 2 state key joint laboratory of environmental simulation and pollution control College of environmental Sciences and Engineering,peking university,Beijing 100871,china 3 Division of environment,Hong Kong university of Science & Technology,Hong Kong,china 1. key laboratory for Urban Habitat environmental Science and Technology school of environment and energy Peking University Shenzhen Graduate School Shenzhen 518055 China2. State Key Joint Laboratory of Environmental Simulation and Pollution Control College of environmental Sciences and Engineering Peking University Beijing 100871 China3. Division of Environment Hong Kong University of Science & Technology Hong Kong China

Secondary organic aerosol (SOA) is one of the major components of aerosols in the atmosphere and has not been well understood so *** to the complex chemical composition of organic aerosols,the identification of SOA has been a hotspot and difficult issue in the field of aerosol *** study attempts to quantitatively identify SOA in winter of shenzhen based on positive matrix factorization (PMF) *** sources were resolved and SOA was identified subsequently according to the characteristic ion fragments measured by highly time-resolved aerosol mass spectrometer *** showed that in the winter of shenzhen the average SOA concentration was 9.41±6.33 g/m 3,accounting for 39.9±21.8% of the total organic *** with primary organic aerosol (POA),the SOA concentrations had no large variation,suggestive of characteristics of regional secondary *** ratio of SOA/BC had pronounced diurnal variation,similar to that of O x (O3+NO2),indicating SOA formation was significantly controlled by activity of photochemistry in the *** most effective period for SOA formation was from 9 am～3 pm since the SOA/BC ratio increased by 122% during this *** study provides a new technical method and a new idea for SOA investigation.

关键词： secondary organic aerosol aerosol mass spectrometry positive matrix factorization (PMF)

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High time resolution observation and statistical analysis of atmospheric light extinction properties and the chemical speciation of fine particulates

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Science china Chemistry 2010年第8期53卷 1801-1808页

作者： YAO TingTing1,HUANG XiaoFeng1,HE LingYan1,HU Min2,SUN TianLe1,XUE Lian1,LIN Yun1,ZENG LiWu1 & ZHANG YuanHang2 1key laboratory for Urban Habitat environmental Science and Technology,school of environment and energy,peking university shenzhen graduate school,shenzhen 518055,china 2state key joint laboratory of environmental simulation and pollution control College of environmental Sciences and Engineering,peking university,Beijing 100871,china 1. key laboratory for Urban Habitat environmental Science and Technology School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen 518055 China2. State Key Joint Laboratory of Environmental Simulation and Pollution Control College of environmental Sciences and Engineering Peking University Beijing 100871 China

In recent years,the visibility deterioration caused by regional fine particulate pollution becomes one of the crucial air pollution problems in the urban areas of our *** rapid variation of visibility and fine particulates make it difficult to estimate the relationship between them precisely and accurately unless high time resolution observation data can be *** study aims to fill this gap in the field of atmospheric science by establishing a formula using multiple linear *** fitting goodness (R2=0.913,n=3167) was obtained using 10 min average of high-resolution real-time light scattering coefficients,light absorption coefficients,main chemical speciation concentration in PM1 and some meteorological parameters from 17 Jan to 16 Feb,*** shows that the average light extinction coefficient during the observation in the winter of shenzhen was measured to be 290 ± 183 Mm?1,consisting of 72% of light scattering and 21% of *** terms of the percentage contribution of PM1 chemical species to the total light extinction,the organic matter was estimated to be most with an average of 45%,followed by ammonium sulfate with an average of 24%.The contributions of black carbon and ammonium nitrate were 17% and 12%,***,the diurnal variation of light extinction was investigated as well in this study.

关键词： light extinction PM1 chemical speciation high time resolution multiple linear regressions

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pollution characteristics of atmospheric fine particles and their secondary components in the atmosphere of shenzhen in summer and in winter

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Science china Chemistry 2006年第5期49卷 466-474页

作者： NIU Yuwen1,2,HE Lingyan1,2,HU Min2,ZHANG Jing2 & ZHAO Yunliang2 1. shenzhen graduate school of peking university,shenzhen 518055,china 2. state joint key laboratory of environmental simulation and pollution control,College of environmental Sciences,peking university,Beijing 100871,china 1. shenzhen graduate school of peking university Shenzhen 518055 China 2. state joint key laboratory of environmental simulation and pollution control College of Environmental Sciences Peking University Beijing 100871 China

Two field measurements for atmospheric fine particles were conducted in Baoan district of shenzhen during the summer and winter in 2004. Totally 30 sets of 24 h samples were collected, and then the mass concentrations and chemical compositions were determined. The seasonal varia- tions and secondary pollution characteristics of fine particles during the sampling periods were dis-cussed with meteorological factors. The results show that seasonal variations of atmospheric particles are significant in shenzhen. The average mass concentrations of PM2.5 and PM10 in summer were 35 μg·m-3 and 57 μg·m-3, respectively, and those in winter were 99 μg·m-3 and 135 μg·m-3, respec-tively. The concentrations of both PM2.5 and PM10 in winter increased 184% and 137%, respectively, compared to those in summer. PM2.5 accounted for 61% and 75% of PM10 in summer and in winter, respectively, indicating severe fine particle pollution in shenzhen. During the summer and winter sampling periods, the mean OC/EC ratios were 3.4 and 1.6, respectively. The estimated secondary organic carbon (SOC) averagely accounted for 56% and 6% of the total OC in summer and in winter, respectively, which implies a major contribution of SOC to OC in summer. During the continuous high temperature period in summer, both the concentrations and fractions of secondary aerosol compo-nents in PM2.5 were highly elevated, suggesting severe secondary pollution again. The prevailing wind was from South china Sea in summer, and the air quality was good. The prevailing wind in winter was from china's Mainland to the north, and the polluted air mass led to poor air quality.

关键词： PM2.5, mass concentration, secondary pollution, seasonal variation, shenzhen.

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Spectral response of rice(Oryza sativa L.) leaves to Fe^(2+) stress

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Science china(Life Sciences) 2009年第8期52卷 747-753页

作者： CHI GuangYu1,2,CHEN Xin1,SHI Yi1 & LIU XinHui3 1 key laboratory of Terrestrial Ecological Process,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,china 2 graduate school of Chinese Academy of Sciences,Beijing 100049,china 3 state key joint laboratory of environmental simulation and pollution control,school of environment,Beijing Normal university,Beijing 100875,china key laboratory of Terrestrial Ecological Process Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China graduate school of Chinese Academy of Sciences Beijing 100049 China state key joint laboratory of environmental simulation and pollution control School of Environment Beijing Normal University Beijing 100875 China

In the management of lake eutrophication,the regulation effect of Fe is considered,in addition to the controlling nitrogen-and phosphorus *** on the "Fe hypothesis",this paper tentatively applied plant spectral response to the remote sensing early-warning mechanism of lake eutrophication.A laboratory water culture experiment with rice(Oryza sativa L.) was conducted to study Fe uptake by plants and the chlorophyll concentration and visible-near infrared spectrum of vegetable leaves as well as their interrelations under Fe2+ *** spectral indices,i.e.,A1(integral value of the changes of spectral reflectivity in the range 460―670 nm under Fe2+ stress),A2(integral value of the changes of spectral reflectivity in the range of 760―1000 nm under Fe2+ stress) and S(blue-shift range of red edge curve under Fe2+ stress),were used to establish quantitative models about the relationships between the rice leaf spectrum and Fe2+ *** the increase of Fe2+ in a culture solution,the Fe content in rice plants increased,while the chlorophyll concentration in vegetative leaves *** spectral reflectivity of vegetable leaves increased in the visible light band but decreased in the near infrared band,and the blue-shift range of the red edge curve *** indices A1,A2 and S all had significant correlations with the Fe content in rice leaves,the correlation coefficient being respectively 0.951(P 2 > 0.96) and predict the Fe level in rice leaves.

关键词： rice(Oryza sativa L.) spectrum Fe2+ lake eutrophication

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Overview of Submicron Aerosol Characterization in china Using an Aerodyne High-resolution Aerosol Mass Spectrometer

Overview of Submicron Aerosol Characterization in China Usin...

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第七届亚洲气溶胶会议

作者： Xiaofeng Huang1 Lingyan He1 Lian Xue1 Min Hu2 and Yuanhang Zhang2 1 key laboratory for Urban Habitat environmental Science and Technology school of environment and energy peking university shenzhen graduate school shenzhen china 2 state key joint laboratory of environmental simulation and pollution control College of environmental Sciences and Engineering peking university Beijing china

china is one of the most rapidly developing countries in the world, but in the meantime it is suffering from severe air pollution due to heavy industrial/metropolitan emissions. Most previous aerosol studies in china were based on filter sampling followed by laboratory analysis, which provided datasets at a coarse time resolution like a day. The coarse time resolution of the aerosol datasets cannot match the actual faster variation of aerosol properties in the real atmosphere, which strongly favors highly time-resolved on-line measurement techniques. In recent years, our group deployed an Aerodyne high-resolution aerosol mass spectrometer （AMS） in different ambient atmospheres in china. In this presentation, we will overview these on-line AMS measurement results to characterize the properties of submicron particles in china atmosphere, with an emphasis for the Pearl River Delta region.

关键词： AMS aerosol characterization

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Characterization of atmospheric submicron particles at a rural site in Pearl River Delta of china using an Aerodyne High-Resolution Aerosol Mass Spectrometer

Characterization of atmospheric submicron particles at a rur...

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第七届海峡两岸气胶技术研讨会暨第二届空气污染技术研讨会

作者： X.-F.Huang1,L.-Y.He1,M.Hu2,Y.-H.Zhang2,Y.Lin1,L.Xue1,T.-L.Sun1 1 key laboratory for Urban Habitat environmental Science and Technology,school of environment and energy,peking university shenzhen graduate school 2 state key joint laboratory of environmental simulation and pollution control,College of environmental Sciences and Engineering,peking university

＜正＞The Pearl River Delta （PRD） region in South china is one of the most economically developed regions in china while also noted for its severe air pollution due to industrial/metropolitan emissions. In order to ... 详细信息

关键词： Aerosol mass spectrometer Chemical characterization PMF

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过滤式碳纤维电极消毒效果比较与机理研究

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环境科学学报 2018年第3期38卷 940-946页

作者：辛蕾霍正洋倪欣业熊德琪胡洪营大连海事大学环境科学与工程学院大连116026 清华大学环境学院环境模拟与污染控制国家重点联合实验室国家环境保护环境微生物利用与安全控制重点实验室北京100084 清华-伯克利深圳学院环境与新能源技术工程实验室深圳518055

过滤式电极消毒作为一种安全、高效的新型消毒技术备受关注,然而目前使用的电极材料比较单一,且稳定性和高效性难以兼备,制约了该技术的设备化发展.本文采用过滤式消毒方式,考察了几种高孔隙率的导电碳纤维毡的消毒效果.结果表明,碳纤... 详细信息

过滤式电极消毒作为一种安全、高效的新型消毒技术备受关注,然而目前使用的电极材料比较单一,且稳定性和高效性难以兼备,制约了该技术的设备化发展.本文采用过滤式消毒方式,考察了几种高孔隙率的导电碳纤维毡的消毒效果.结果表明,碳纤维毡电极具有优异的消毒能力,活性碳纤维电极可在几伏的电压下使细菌死亡,与传统电化学消毒相比,电压降低了1~2个数量级.其中A-PCF(聚丙烯腈基活性碳纤维)电极在外接电压2 V,水力停留时间2 s时即可对大肠杆菌菌液实现>6.5log的去除.当外接电压≤2 V时,流出物中未检测到氯,pH保持不变,排除了电化学产物的影响.A-PCF可作为过滤式电极消毒的优选电极材料.

关键词：水消毒多孔电极活性碳纤维纳米结构微电场

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印染废水反渗透脱盐系统运行性能及膜污堵特性

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环境科学 2018年第5期39卷 2249-2255页

作者：谭玉珺张泽田吴乾元姚颖胡洪营丘培文清华大学深圳研究生院国家环境保护环境微生物利用与安全控制重点实验室深圳518055 清华大学环境学院环境模拟与污染控制国家重点联合实验室国家环境保护环境微生物利用与安全控制重点实验室北京100084 佛山市佳利达环保科技股份有限公司佛山528000 清华-伯克利深圳学院环境与新能源技术工程实验室深圳518055

反渗透(RO)脱盐工艺对实现印染废水再生利用具有重要的意义.膜污堵却制约了RO工艺应用.对广东省某工业园区印染废水RO脱盐系统运行性能及膜污堵特性进行了研究.结果表明,印染废水生化处理出水经臭氧氧化-砂滤-超滤(UF)预处理后,RO进水CO... 详细信息

反渗透(RO)脱盐工艺对实现印染废水再生利用具有重要的意义.膜污堵却制约了RO工艺应用.对广东省某工业园区印染废水RO脱盐系统运行性能及膜污堵特性进行了研究.结果表明,印染废水生化处理出水经臭氧氧化-砂滤-超滤(UF)预处理后,RO进水COD平均浓度为12.4 mg·L^(-1),浊度2 NTU.但RO系统运行3 a后,跨膜压差高达0.6 MPa,产水量下降至120 m^3·h^(-1),且不能通过化学清洗恢复,在RO膜面沉积了不可逆的污堵物.RO膜面的有机物占总污堵物干重的(53.5±0.2)%,无机物占(46.5±0.2)%,RO膜面有机污堵与无机污堵贡献相近.Si、Al与Ca是RO膜面主要的无机元素.碱液(Na OH溶液)对沉积在RO膜面的Si与Al及有机物提取效果较好.

关键词：印染废水反渗透工艺运行效果膜污堵膜解剖

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