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  1. Article ; Online: Atmospheric Reactive Nitrogen Species Weaken the Air Quality Response to Emission Reductions in China.

    Ye, Can / Wang, Haichao / Li, Xuan / Lu, Keding / Zhang, Yuanhang

    Environmental science & technology

    2024  Volume 58, Issue 14, Page(s) 6066–6070

    MeSH term(s) Air Pollution/prevention & control ; Air Pollutants/analysis ; China ; Particulate Matter/analysis ; Environmental Monitoring ; Ozone/analysis
    Chemical Substances Air Pollutants ; Particulate Matter ; Ozone (66H7ZZK23N)
    Language English
    Publishing date 2024-04-01
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.3c10927
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Review of technologies and their applications for the speciated detection of RO2 radicals

    Gao, Yue / Lu, Keding / Zhang, Yuanhang

    Journal of environmental sciences (China). 2022 Sept. 19,

    2022  

    Abstract: Peroxy radicals (RO₂), which are formed during the oxidation of volatile organic compounds, play an important role in atmospheric oxidation reactions. Therefore, the measurement of RO₂, especially distinct species of RO₂ radicals, is important and ... ...

    Abstract Peroxy radicals (RO₂), which are formed during the oxidation of volatile organic compounds, play an important role in atmospheric oxidation reactions. Therefore, the measurement of RO₂, especially distinct species of RO₂ radicals, is important and greatly helps the exploration of atmospheric chemistry mechanisms. Although the speciated detection of RO₂ radicals remains challenging, various methods have been developed to study them in detail. These methods can be divided into spectroscopy and mass spectrometry technologies. The spectroscopy methods contain laser-induced fluorescence (LIF), UV-absorption spectroscopy, cavity ring-down spectroscopy (CRDS) and matrix isolation and electron spin resonance (MIESR). The mass spectrometry methods contain chemical ionization atmospheric pressure interface time-of-flight mass spectrometry (CI-APi-TOF), chemical ionization mass spectrometry (CIMS), CI-Orbitrap-MS and the third-generation proton transfer reaction–time-of-flight mass spectrometer (PTR3). This article reviews technologies for the speciated detection of RO₂ radicals and the applications of these methods. In addition, a comparison of these techniques and the reaction mechanisms of some key species are discussed. Finally, possible gaps are proposed that could be filled by future research into speciated RO₂ radicals.
    Keywords atmospheric chemistry ; atmospheric pressure ; electron paramagnetic resonance spectroscopy ; fluorescence ; ionization ; mass spectrometry ; oxidation ; spectrometers ; volatile organic compounds ; China
    Language English
    Dates of publication 2022-0919
    Publishing place Elsevier B.V.
    Document type Article
    Note Pre-press version
    ZDB-ID 1092300-7
    ISSN 1878-7320 ; 1001-0742
    ISSN (online) 1878-7320
    ISSN 1001-0742
    DOI 10.1016/j.jes.2022.09.028
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    In stock of ZB MED Bonn / Germany

    Z 7630: Show issues

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  3. Article: Compilation of reaction kinetics parameters determined in the Key Development Project for Air Pollution Formation Mechanism and Control Technologies in China

    Liu, Yuehui / Zhou, Ming / Lu, Keding

    Journal of environmental sciences (China). 2022 June 14,

    2022  

    Abstract: A compilation of new advances made in the research field of laboratory reaction kinetics in China's Key Development Project for Air Pollution Formation Mechanism and Control Technologies was presented. These advances are grouped into six broad, ... ...

    Abstract A compilation of new advances made in the research field of laboratory reaction kinetics in China's Key Development Project for Air Pollution Formation Mechanism and Control Technologies was presented. These advances are grouped into six broad, interrelated categories, including volatile organic compound (VOC) oxidation, secondary organic aerosol (SOA) formation, new particle formation (NPF) and gas-particle partitioning, ozone chemistry, model parameters, and secondary inorganic aerosol (SIA) formation, highlighting the laboratory work done by Chinese researchers. For smog chamber applications, the current knowledge gained from laboratory studies is reviewed, with emphasis on summarizing the oxidation mechanisms of long-chain alkanes, aromatics, alkenes, aldehydes/ketones in the atmosphere, SOA formation from anthropogenic emission sources, and oxidation of aromatics, isoprene, and limonene, as well as SIA formation. For flow tube applications, atmospheric oxidation mechanisms of toluene and methacrolein, SOA formation from limonene oxidation by ozone, gas-particle partitioning of peroxides, and sulfuric acid-water (H₂SO₄-H₂O) binary nucleation, methanesulfonic acid-water (MSA-H₂O) binary nucleation, and sulfuric acid-ammonia-water (H₂SO₄-NH₃-H₂O) ternary nucleation are discussed.
    Keywords aerosols ; air pollution ; development projects ; isoprene ; limonene ; oxidation ; ozone ; reaction kinetics ; smog pollution ; toluene ; volatile organic compounds ; China
    Language English
    Dates of publication 2022-0614
    Publishing place Elsevier B.V.
    Document type Article
    Note Pre-press version
    ZDB-ID 1092300-7
    ISSN 1878-7320 ; 1001-0742
    ISSN (online) 1878-7320
    ISSN 1001-0742
    DOI 10.1016/j.jes.2022.06.021
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  4. Article ; Online: Ozone mitigations beyond the control of nitrogen oxides and volatile organic compounds.

    Lu, Keding / Zhou, Houhua / Lee, James / Nelson, Beth / Zhang, Yuanhang

    Science bulletin

    2023  Volume 68, Issue 18, Page(s) 1989–1992

    Language English
    Publishing date 2023-08-01
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2816140-3
    ISSN 2095-9281 ; 2095-9273
    ISSN (online) 2095-9281
    ISSN 2095-9273
    DOI 10.1016/j.scib.2023.07.051
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  5. Article ; Online: Monitoring Ambient Nitrate Radical by Open-Path Cavity-Enhanced Absorption Spectroscopy.

    Wang, Haichao / Lu, Keding

    Analytical chemistry

    2019  Volume 91, Issue 16, Page(s) 10687–10693

    Abstract: We describe an open-path cavity-enhanced absorption spectroscopy (OP-CEAS) technique for the ambient measurement of nitrate radicals ( ... ...

    Abstract We describe an open-path cavity-enhanced absorption spectroscopy (OP-CEAS) technique for the ambient measurement of nitrate radicals (NO
    Language English
    Publishing date 2019-08-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.9b01971
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 4033: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  6. Article ; Online: Revisiting the Ultraviolet Absorption Cross Section of Gaseous Nitrous Acid (HONO): New Insights for Atmospheric HONO Budget.

    Li, Xuan / Tian, Shasha / Zu, Kexin / Xie, Shuyang / Dong, Huabin / Wang, Haichao / Chen, Shiyi / Li, Yang / Lu, Keding / Zhang, Yuanhang

    Environmental science & technology

    2024  Volume 58, Issue 9, Page(s) 4247–4256

    Abstract: Nitrous acid (HONO) is an important source of hydroxyl radicals (OH) in the atmosphere. Precise determination of the absolute ultraviolet (UV) absorption cross section of gaseous HONO lays the basis for the accurate measurement of its concentration by ... ...

    Abstract Nitrous acid (HONO) is an important source of hydroxyl radicals (OH) in the atmosphere. Precise determination of the absolute ultraviolet (UV) absorption cross section of gaseous HONO lays the basis for the accurate measurement of its concentration by optical methods and the estimation of HONO loss rate through photolysis. In this study, we performed a series of laboratory and field intercomparison experiments for HONO measurement between striping coil-liquid waveguide capillary cell (SC-LWCC) photometry and incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS). Specified HONO concentrations prepared by an ultrapure standard HONO source were utilized for laboratory intercomparisons. Results show a consistent ∼22% negative bias in measurements of the IBBCEAS compared with a SC-LWCC photometer. It is confirmed that the discrepancies occurring between these techniques are associated with the overestimation of the absolute UV absorption cross sections through careful analysis of possible uncertainties. We quantified the absorption cross section of gaseous HONO (360-390 nm) utilizing a custom-built IBBCEAS instrument, and the results were found to be 22-34% lower than the previously published absorption cross sections widely used in HONO concentration retrieval and atmospheric chemical transport models (CTMs). This suggests that the HONO concentrations retrieved by optical methods based on absolute absorption cross sections may have been underestimated by over 20%. Plus, the daytime loss rate and unidentified sources of HONO may also have evidently been overestimated in pre-existing studies. In summary, our findings underscore the significance of revisiting the absolute absorption cross section of HONO and the re-evaluation of the previously reported HONO budgets.
    MeSH term(s) Nitrous Acid/analysis ; Gases/analysis ; Air Pollutants/analysis ; Spectrum Analysis ; Photolysis
    Chemical Substances Nitrous Acid (T2I5UM75DN) ; Gases ; Air Pollutants
    Language English
    Publishing date 2024-02-19
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.3c08339
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  7. Article ; Online: Atmospheric Oxidation Capacity Elevated during 2020 Spring Lockdown in Chengdu, China: Lessons for Future Secondary Pollution Control.

    Tan, Zhaofeng / Feng, Miao / Liu, Hefan / Luo, Yina / Li, Wei / Song, Danlin / Tan, Qinwen / Ma, Xuefei / Lu, Keding / Zhang, Yuanhang

    Environmental science & technology

    2024  

    Abstract: This study presents the measurement of photochemical precursors during the lockdown period from January 23, 2020, to March 14, 2020, in Chengdu in response to the coronavirus (COVID-19) pandemic. To derive the lockdown impact on air quality, the ... ...

    Abstract This study presents the measurement of photochemical precursors during the lockdown period from January 23, 2020, to March 14, 2020, in Chengdu in response to the coronavirus (COVID-19) pandemic. To derive the lockdown impact on air quality, the observations are compared to the equivalent periods in the last 2 years. An observation-based model is used to investigate the atmospheric oxidation capacity change during lockdown. OH, HO
    Language English
    Publishing date 2024-05-11
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.3c08761
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  8. Article ; Online: Determination of Urban Formaldehyde Emission Ratios in the Shanghai Megacity.

    Liu, Yuehui / Zhou, Ming / Zhao, Min / Jing, Shengao / Wang, Hongli / Lu, Keding / Shen, Hengqing

    Environmental science & technology

    2023  Volume 57, Issue 43, Page(s) 16489–16499

    Abstract: We analyzed two data sets of atmospheric formaldehyde (FA) at an urban site in the Shanghai megacity during the summer of 2017 and the winter of 2017/18, with the primary objective of determining the emission ratio of formaldehyde versus carbon monoxide ( ...

    Abstract We analyzed two data sets of atmospheric formaldehyde (FA) at an urban site in the Shanghai megacity during the summer of 2017 and the winter of 2017/18, with the primary objective of determining the emission ratio of formaldehyde versus carbon monoxide (CO). Through the photochemical age method and the minimum R squared (MRS) method, we derived the summer urban formaldehyde release ratios of 3.37 ppbv (ppmv of CO)
    MeSH term(s) Air Pollutants/analysis ; Environmental Monitoring/methods ; China ; Vehicle Emissions/analysis ; Formaldehyde/analysis ; Ozone/analysis
    Chemical Substances Air Pollutants ; Vehicle Emissions ; Formaldehyde (1HG84L3525) ; Ozone (66H7ZZK23N)
    Language English
    Publishing date 2023-10-16
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.3c06428
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Monitoring Ambient Nitrate Radical by Open-Path Cavity-Enhanced Absorption Spectroscopy

    Wang, Haichao / Lu, Keding

    Analytical chemistry. 2019 July 31, v. 91, no. 16

    2019  

    Abstract: We describe an open-path cavity-enhanced absorption spectroscopy (OP-CEAS) technique for the ambient measurement of nitrate radicals (NO3) near 662 nm. Compared with the closed type of CEAS system with a sampling line, the OP-CEAS features high accuracy ... ...

    Abstract We describe an open-path cavity-enhanced absorption spectroscopy (OP-CEAS) technique for the ambient measurement of nitrate radicals (NO3) near 662 nm. Compared with the closed type of CEAS system with a sampling line, the OP-CEAS features high accuracy due to the lack of NO3 loss in the sampling line and cavity. On the basis of a 0.84 m long open-path cavity, the effective absorption length of ∼5 km is achieved by mirrors with a reflectivity of 0.99985 at 662 nm. The detection limit of OP-CEAS for the measurement of NO3 is 3.0 pptv (2σ) in 30 s, and the uncertainty is 11–15%. The instrument was successfully applied in a field measurement under low particulate matter (PM) loading conditions. As the sensitivity would be decreased due to strong PM extinction under heavy PM pollution conditions, we highlight the feasibility of this OP-CEAS configuration for field application in clean and moderate PM condition, such as forested regions affected by anthropogenic emissions. This technique is also appropriate for the field detection of other reactive trace gases in future studies.
    Keywords absorption ; detection limit ; emissions ; extinction ; free radicals ; gases ; monitoring ; nitrates ; particulates ; pollution ; spectroscopy ; uncertainty
    Language English
    Dates of publication 2019-0731
    Size p. 10687-10693.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.9b01971
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    Z 4' 52/94: Show issues
    Z 2.9: Show issues

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  10. Article ; Online: Impact of aerosol in-situ peroxide formations induced by metal complexes on atmospheric H2O2 budgets

    Song, Huan / Lu, Keding / Dong, Huabin / Tan, Zhaofeng / Chen, Shiyi / Chen, Chongming / Zeng, Limin / Zhang, Yuanhang

    Science of the Total Environment. 2023 Sept., v. 892 p.164455-

    2023  

    Abstract: Hydrogen peroxide (H₂O₂), hydroxyl radicals (OH), hydroperoxyl (HO₂), and superoxide (O₂⁻) radicals interacting with aerosol particles significantly affect the atmospheric pollutant budgets. A multiphase chemical kinetic box model (PKU-MARK), including ... ...

    Abstract Hydrogen peroxide (H₂O₂), hydroxyl radicals (OH), hydroperoxyl (HO₂), and superoxide (O₂⁻) radicals interacting with aerosol particles significantly affect the atmospheric pollutant budgets. A multiphase chemical kinetic box model (PKU-MARK), including the multiphase processes of transition metal ions (TMI) and their organic complexes (TMI-OrC), was built to numerically drive H₂O₂ chemical behaviors in the aerosol particle liquid phase using observational data obtained from a field campaign in rural China. Instead of relying on fixed uptake coefficient values, a thorough simulation of multiphase H₂O₂ chemistry was performed. In the aerosol liquid phase, light-driven TMI-OrC reactions promote OH, HO₂/O₂⁻, and H₂O₂ recycling and spontaneous regenerations. The in-situ generated aerosol H₂O₂ would offset gas-phase H₂O₂ molecular transfer into the aerosol bulk phase and promote the gas-phase level. When combined with the multiphase loss and in-situ aerosol generation involving TMI-OrC mechanism, the HULIS-Mode significantly improves the consistency between modeled and measured gas-phase H₂O₂ levels. Aerosol liquid phase could be a pivotal potential source of aqueous H₂O₂ and influence the multiphase budgets. Our work highlights the intricate and significant effects of aerosol TMI and TMI-OrC interactions on the multiphase partitioning of H₂O₂ when assessing atmospheric oxidant capacity.
    Keywords aerosols ; environment ; hydrogen peroxide ; liquids ; models ; observational studies ; oxidants ; pollutants ; China ; Multiphase chemistry kinetic model ; H2O2 ; TMI and organic complexes ; Radicals
    Language English
    Dates of publication 2023-09
    Publishing place Elsevier B.V.
    Document type Article ; Online
    Note Pre-press version
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2023.164455
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    Z 74/341: Show issues

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