检索结果-南通市图书馆

Journal of Environmental Sciences 2012年第1期24卷 22-33页

作者： V.Catoire F.Bernard Y.Mbarki a.mellouki G.Eyglunent V.Daёle C.Robert Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E) CNRS-Universit d'Orlans (UMR 6115)Observatoire des Sciences de l'Univers en rgion Centre (OSUC)3A Avenue de la Recherche Scientifique45071 Orlans Cedex 2France Institut de Combustion ArothermiqueRactivit et Environnement (ICARE)CNRS (UPR 3021)Observatoire des Sciences de l'Univers en rgion Centre (OSUC)1C Avenue de la Recherche Scientifique45071 Orlans Cedex 2France

A tunable diode laser absorption spectrometer （TDLAS） for formaldehyde atmospheric measurements has been set up and validated through comparison experiments with a Fourier transform infrared spectrometer （FT-IR） in a simulation *** was generated in situ in the chamber from reaction of ethene with *** HCHO ro-vibrational line intensities （at 2909.71,2912.09 and 2914.46 cm-1） possibly used by TDLAS were calibrated by FT-IR spectra simultaneously recorded in the 1600–3200 cm-1 domain during ethene ozonolysis,enabling the on-line deduction of the varying concentration for HCHO in *** experimental line intensities values inferred confirmed the calculated ones from the updated HITRAN *** addition,the feasibility of stratospheric in situ HCHO measurements using the 2912.09 cm-1 line was *** TDLAS performances were also assessed,leading to a 2σ detection limit of 88 ppt in volume mixing ratio with a response time of 60 sec at 30 Torr and 294 K for 112 m optical *** part of this work,the room-temperature rate constant of this reaction and the HCHO formation yield were found to be in excellent agreement with the compiled literature data.

关键词： formaldehyde ethene ozonolysis in situ measurements stratosphere simulation chamber TDLAS FT-IR

Levels,sources and health risks of carbonyls and BTEX in the ambient air of Beijing,China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2012年第1期24卷 124-130页

作者： Yujie Zhang Yujing Mu Junfeng Liu Abdelwahid mellouki Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Centre National de Recherche Scientifique-Institut de Combustion AerothermiqueReactivite et Environnement(CNRS-ICARE)45071 Orleans cedex 02France

The atmospheric concentrations of carbonyls and BTEX （benzene,toluene,ethylbenzene,m,p-xylene and o-xylene） were measured simultaneously at a same sampling site in Beijing from September 2008 to August *** average concentrations of the total measured carbonyls during autumn,winter,spring,and summer were 37.7,31.3,39.7,50.5 μg/m 3,respectively,and maximal values for their diurnal variations usually happened at *** contrast to carbonyls,the average concentrations of the total measured BTEX during the four seasons were 27.2,31.9,23.2,19.1 μg/m 3,respectively,andminimal values for their diurnal variations always occurred in the early *** average concentration for carbonyls increased about 24% from September 2008–August 2009 to September 2009–August 2010,for BTEX,increased about 15%.Integrated life time cancer risks for three carcinogens （benzene,formaldehyde and acetaldehyde） in Beijing exceeded the value of 1E-06,and the hazard quotient （HQ） of non-cancer risk of exposure to formaldehyde exceeded unity.

关键词： carbonyls BTEX sources exposure and risk assessment Beijing

Kinetic and product studies of Cl atoms reactions with a series of branched Ketones

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2018年第9期30卷 271-282页

作者： Yangang Ren Jinhe Wang Benoit Grosselin Veronique Daele Abdelwahid mellouki Institut de Combustion Aerothermique Reactivite et Environnement (/CARE) CNRS (UPR 3021) 1C Avenue de la Recherche Scientifique45071 Orleans Cedex 2 France School of Municipal and Environmental Engineering Shandong Jianzhu University Jinan 250101 China

The rate constants for the C1 atom reaction with three branched ketones have been measured at 298 ± 2 K and 760 Torr using the relative rate method in the absence of NO. The rate constants values obtained （in units of 10^-10 cm^3/（***）） are： k（2-methyl-3-pentanone） = 1.07 ± 0.26, k（3-methyl-2-pentanone） =1.21 ± 0.26, and k（4-methyl-2-pentanone） = 1.35 ± 0.27. Combining the chemical kinetic data obtained by this study with those reported for other ketones, a revised Structure Activity Relationship （SAR） parameter and R group reactivity （kR of R（O）R＇ and CHx （x = 1, 2, 3） group reactivity （kCHx） toward C1 atoms were proposed. In addition, the products from the three reactions in the presence of NO were also identified and quantified by using PTR-ToF-MS and GC-FID, and the yields of the identified products are： acetone （39% ± 8%）＋ ethanal （78% ± 12%）, 2-butanone （22% ± 2%）＋ ethanal （75% ± 10%）＋ propanal （14% ± 1%） and acetone （26% ± 3%）＋ 2-methylpmpanal （24% ± 2%）, for C1 atoms reaction with 2-methyl-3-pentanone, 3-methyl-2-pentanone and 4-methyl-2-pentanone, respectively. Based on the obtained results, the reaction mechanisms of C1 atoms with these three ketones are proposed.

关键词： Ketones Cl atoms Rate constants Products Mechanism

Seasonal,diurnal and nocturnal variations of carbonyl compounds in the semi-urban environment of Orléans,France

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2016年第2期28卷 84-91页

作者： Zhaohui Jiang Benoit Grosselin Véronique Daele Abdelwahid mellouki Yujing Mu Institut de Combustion Aerothermique Reactivite Environnement (ICARE) CNRS/OSUC 1C Avenue de la Recherche Scientijique 45071 Orleans Cedex 02 France College of Chemical and Biological Engineering Changsha University of Science and Technology Changsha 410004 China Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Atmospheric carbonyls were measured at a semi-urban site in Orléans, France, from October 2010to July2011. Formaldehyde, acetaldehyde and acetone were found to be the most abundant carbonyls, with average concentrations of 3.1, 1.0, 2.0 ppb, respectively in summer, 2.3, 0.7, 2.2 ppb, respectively in autumn, 2.2, 1.0, 2.1 ppb, respectively in spring,and 1.5, 0.7, 1.1 ppb, respectively in winter. Photo-oxidation of volatile organic compounds（VOCs） was found to make a remarkable contribution to atmospheric carbonyls in the semi-urban site based on the distinct seasonal and diurnal variations of the carbonyls, as well as the significantly positive correlations between the carbonyls and ozone. The significantly negative correlations between NO x and O_3 as well as the carbonyls and the positive correlations between wind speed and O_3 as well as the carbonyls implied that the carbonyls and O_3 at the semi-urban site were probably formed during air mass transport from neighboring cities.

关键词： Carbonyls Measurements Semi-urban

Kinetic and product studies of the reactions of NO3 with a series of unsaturated organic compounds

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第9期32卷 111-120页

作者： Yangang Ren Max McGillen Ibrahim Ouchen Veronique Daële Abdelwahid mellouki Centre National de la Recherche Scientifique(CNRS)(UPR 3021) Observatoire des Sciences de l’Univers en région Centre(OSUC)Institut de CombustionAérothermiqueRéactivitéet Environnement(ICARE)Orléans 45071France Earth Sciences Department Scientific InstituteMohammed V UniversityRabat 10106Morocco Le Studium Loire Valley Institute for Advanced Studies Orléans 45071France

Rate coefficients for the reaction of N03 radicals with 6 unsaturated volatile organic compounds(VOCs) in a 7300 L simulation chamber at ambient temperature and pressure have been determined by the relative rate *** resulting rate coefficients were determined for isoprene,2-carene,3-carene,methyl vinyl ketone(MVK),methacrolein(MACR)and crotonaldehyde(CA),as(6.6±0.8)×10-13,(1.8±0.6)×10-11,(8.7±0.5)×10-12,(1.24±1.04)×10-16,(3.3±0.9)×10-15 and(5.7±1.2)×10-15 cm3/(molecule·sec),*** experiments indicate that NO3 radical reactions with all the studied unsaturated VOGs proceed through addition to the olefinic bond,however,it indicates that the introduction of a carbonyl group into unsaturated VOGs can deactivate the neighboring olefinic bond towards reaction with the NO3 radical,which is to be expected since the presence of these electronwithdrawing substituents will reduce the electron density in the π orbitals of the alkenes,and will therefore reduce the rate coefficient of these electrophilic addition *** addition,we investigated the product formation from the reactions of 2-carene and 3-carene with the NO3 *** identification of an epoxide(C10H16OH+),caronaldehyde(C10H16O2 H+) and nitrooxy-ketone(C10H16O4 NH+) was achieved using a proton transfer reaction time-of-flight mass spectrometer(PTR-TOF-MS) and a reaction mechanism is proposed.

关键词： Rate coefficient NO_(3) radical Products Volatile organic compounds(VOCs)

The Second Sino-French Workshop on Atmospheric Environment (Orleans,December 2010):Preface

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2012年第1期24卷 1-1页

作者： Abdelwahid mellouki ICARE-CNRS

A sound scientific understanding of the factors affecting the environment is essential to guarantee the sustainable development of the world＇s economic and societal activities. Many environmental issues,such as air q... 详细信息

关键词： Orleans,December 2010 Preface The Second Sino-French Workshop on Atmospheric Environment

Characterization of peroxyacetyl nitrate（PAN）under different PM2.5 concentration in wintertime at a North China rural site

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第04期114卷 221-232页

作者： Zhuoyu Li Guangzhao Xie Hui Chen Bixin Zhan Lin Wang Yujing Mu Abdelwahid mellouki Jianmin Chen Department of Environmental Science & Engineering Fudan Tyndall Center Institute of Atmospheric SciencesFudan University Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Institut de Combustion Aérothermique Réactivité et Environnement Centre National de la Recherche Scientifique

As a secondary pollutant of photochemical pollution, peroxyacetyl nitrate（PAN） has attracted a close attention. A four-month campaign was conducted at a rural site in North China Plain（NCP） including the measurement of PAN, O3, NOx, PM2.5, oxygenated volatile organic compounds（OVOCs）, photolysis rate constants of NO2and O3and meteorological parameters to investigate the wintertime characterization of photochemistry from November 2018 to February 2019. The results showed that the maximum and mean values of PAN were 4.38 and 0.93 ± 0.67 ppbv during the campaign, respectively. The PAN under different PM2.5concentrations from below 75 μg/m3up to 250 μg/m3, showed different diurnal variation and formation rate. In the PM2.5concentration range of above 250 μg/m3, PAN had the largest daily mean value of 0.64 ppbv and the fastest production rate of 0.33 ppbv/hr. From the perspective of PAN's production mechanism, the light intensity and precursors concentrations under different PM2.5pollution levels indicated that there were sufficient light intensity and high volatile organic compounds（VOCs） and NOxprecursors concentration even under severe pollution level to generate a large amount of PAN. Moreover, the bimodal staggering phenomenon of PAN and PM2.5provided a basis that PAN might aggravate haze through secondary organic aerosols（SOA） formation.

关键词： Peroxyacetyl nitrate PM2.5 Wintertime North China Rural site

Impact of photocatalytic remediation of pollutants on urban air quality

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2016年第5期10卷 37-47页

作者： Christian GEORGE Anne BEELDENS Fotios BARMPAS Jean-Francois DOUSSIN Giuseppe MANGANELLI Hartmut HERRMANN Jorg KLEFFMANN Abdelwahid mellouki Universite Lyon 1 CNRS UMR 5256 IRCELYON Institut de recherches sur la catalyse et l'environnement de Lyon Villeurbanne F-69626 France Belgian Road Research Centre (BRRC) Woluwedal 42-1200 Brussels Belgium Laboratory of Heat Transfer and Environmental Engineering (LHTEE) Aristotle University of Thessaloniki Box 483 GR 54124 Thessaloniki Greece LISA UMR CNRS 7583 Universite Paris Est Creteil et Universite Paris Diderot Institut Pierre Simon Laplace Crrteil 94010 France 5 CTG Italcementi Group Via Stezzano 87 24126 Bergamo Italy CTG Italcementi Group Via Stezzano 87 24126 Bergamo Italy Physikalische und Theoretische Chemie / School of Mathematics and Natural Sciences Bergische Universitat Wuppertal (BUW) 42119 Wuppertal Germany Leibniz-Institut fur Troposphairenforschunge.V. (TROPOS) Atmospheric Chemistry Department 04318 Leipzig Germany Institut de Combustion Aerothermique Reactivite et Environnement (ICARE) CNRS (UPR 3021)/OSUC IC Avenue de la Recherche Scientifique Orleans 457071 France

In the recent years, photocatalytic self-cleaning and ＂depolluting＂ materials have been suggested as a remediation technology mainly for NOx and aromatic VOCs in urban areas. A number of products incorporating the aforementioned technology have been made commercially available with the aim to improve urban air quality. These commercial products are based on the photocatalytic properties of a thin layer of TiO2 at the surface of the material （such as glass, pavement, etc.） or embedded in paints or concrete. The use of TiO2 photocatalysts as an emerging air pollution control technology has been reported in many locations worldwide. However, up to now, the effectiveness measured in situ and theexpected positive impact on air quality of this relatively new technology has only been demonstrated in a limited manner. Assessing and demonstrating the effectiveness of these depolluting techniques in real scale applications aims to create a real added value, in terms of policy making （i.e., implementing air quality strategies） and economics （by providing a demonstration of the actual performance of a new technique）.

关键词： Photocatalysis Air pollution Depollution efficiency NOx VOC Air quality abatement and management

在线全文

学校读者我要写书评

暂无评论

二硫化碳气体近紫外吸收截面积测定

光谱学与光谱分析 2009年第6期29卷 1586-1589页

作者：汪海涛胡长江牟玉静 Abdelwahid mellouki 中国科学院生态环境研究中心北京100085 Centre National de Recherche Scientifique Institut de CombustionAérothermique

利用二极管阵列光谱仪,室温条件下,在波长220～380 nm的波段内,测量了CS2的紫外吸收截面积。发现CS2在315 nm处具有较大吸收,其值为σ=7.184×***-1。与文献报道进行了比对,吻合较好,并利用所获得的数据对CS2大气光解寿命进行了评估。

关键词：二硫化碳紫外吸收截面积光解二极管阵列光谱仪

Sources,chemistry,impacts and regulations of complex air pollution：Preface

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2016年第2期28卷 1-1页

作者： Abdelwahid mellouki Shandong University

Clean air is essential to people＇s health and that of the *** the industrial revolution,however,the quality of the air that people breathe has deteriorated considerably—mainly as a result of human *** industrial and energy production,the burning of fossil fuels and the dramatic rise in traffic all contribute to air pollution in our cities which,in turn,

关键词： revolution considerably fossil regulations Clean instance dramatic traffic workshop deliver