Source apportionments of atmospheric volatile organic compounds in Nanjing, China during high ozone pollution season

Fan, Mei‐Yi; Zhang, Yanlin; Lin, Yu‐Chi; Li, Lin; Xie, Feng; Hu, Jianlin; Mozaffar, Ahsan; Cao, Fang

doi:10.1016/j.chemosphere.2020.128025

Cited by 75 publications

(37 citation statements)

References 56 publications

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“…The influence of wind speed on ground O 3 concentrations was insignificant (-0.088). This result matches those in earlier studies (Chen et al, 2020;Fan et al, 2020).…”

Section: Discussionsupporting

confidence: 93%

“…Factor 4 was considered background pollution. High percentages of propane, acetylene, n-butane, cyclohexane, ethylbenzene, o-xylene, isobutane, m/p-xylene, and n-hexane are found in vehicle exhaust (Fan et al, 2020), and these characteristics are consistent with factors 5 and 7. The proportion of isopentane in gasoline exhaust is more than that found in diesel exhaust (Ly et al, 2020).…”

Section: O 3 Control Strategiessupporting

confidence: 56%

“…where, x ij is the concentration of species j measured in sample i; g ik is the contribution of the source k to the sample i; f kj is the profile of the species i in the source k; e ij is the residual of species j in sample i; and p represents the total number of sources (Fan et al, 2020). In this study, we measured 70 VOC species and divided these species into three categories according to their signal-to-noise ratio (S/N) and detection limit (BDL).…”

Section: Positive Matrix Factorization Modelmentioning

confidence: 99%

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Peer Review #1 of "Ambient ozone pollution at a coal chemical industry city in the border of Loess Plateau and Mu Us Desert: characteristics, sensitivity analysis and control strategies (v0.1)"

2021

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In this study, ambient ozone (O 3 ) pollution characteristics and sensitivity analysis were carried out in Yulin, a city in the central area of the Loess Plateau during 2017 to 2019 summer. O 3 concentrations increased for 2017 to 2019. Correlation and statistics analysis indicated high temperature (T>25℃), low relative humidity (RH<60%), and low wind speed (WS<3m/s) were favorable for O 3 formation and accumulation, and the O 3 pollution days (MDA8 O 3 >160µg/m 3 ) were predominantly observed when the wind was traveling from the easterly and southerly. O 3 concentration in urban area of Yulin was higher than that in background. The pollution air masses from Fenwei Plain increase the level and duration of O 3 pollution. In order to clarify the formation mechanism and source of O 3 , online measurements of volatile organic compounds (VOCs) were conducted from 7 July to 10 August in 2019. The average of VOCs concentration was 26±12 ppbv, and large amounts of alkenes followed by aromatics, characteristic pollutants of the coal chemical industry, were detected in the ambient air. To further measure the sensitivity, the observation-based model (OBM) simulation was conducted. Empirical Kinetic Modeling Approach (EKMA) plot and relative incremental reactivity (RIR) value indicated Yulin located on VOCs-limited regime. That implied a slight decrease of NO x may increase O 3concentration. When the emission reduction ratio of anthropogenic VOCs/NO x higher than 1:1, the O 3 will decrease. O 3 control strategies analysis shows that the O 3 targets of 5% and 10% O 3 concentration reductions are achievable through precursor control, but more effort is needed to reach the 30% and 40% reduction control targets.

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“…The influence of wind speed on ground O 3 concentrations was insignificant (-0.088). This result matches those in earlier studies (Chen et al, 2020;Fan et al, 2020).…”

Section: Discussionsupporting

confidence: 93%

Section: O 3 Control Strategiessupporting

confidence: 56%

Section: Positive Matrix Factorization Modelmentioning

confidence: 99%

See 1 more Smart Citation

Peer Review #1 of "Ambient ozone pollution at a coal chemical industry city in the border of Loess Plateau and Mu Us Desert: characteristics, sensitivity analysis and control strategies (v0.1)"

2021

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show abstract

“…Factor 4 was considered background pollution. High percentages of propane, acetylene, n-butane, cyclohexane, ethylbenzene, o-xylene, isobutane, m/p-xylene, and n-hexane are found in vehicle exhaust ( Fan et al, 2020 ), and these characteristics are consistent with factors 5 and 7. The proportion of isopentane in gasoline exhaust is more than that found in diesel exhaust ( Ly et al, 2020 ).…”

Section: Discussionmentioning

confidence: 52%

“…A detailed description of the PMF model can be found in the EPA PMF 5.0 User Guide. Briefly, the ambient VOC observations matrix (x) was decomposed into two matrices: source profile (f) and source contribution (g): where, x ij is the concentration of species j measured in sample i; g ik is the contribution of the source k to the sample i; f kj isthe profile of the species i in the source k; e ij is the residual of species j in sample i; and p represents the total number of sources ( Fan et al, 2020 ). In this study, we measured 70 VOC species and divided these species into three categories according to their signal-to-noise ratio (S/N) and detection limit (BDL).…”

Section: Methodsmentioning

confidence: 99%

Ambient ozone pollution at a coal chemical industry city in the border of Loess Plateau and Mu Us Desert: characteristics, sensitivity analysis and control strategies

Yin

Zhang

et al. 2021

PeerJ

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In this study, ambient ozone (O3) pollution characteristics and sensitivity analysis were carried out in Yulin, a city in the central area of the Loess Plateau during 2017 to 2019 summer. O3 concentrations increased for 2017 to 2019. Correlation and statistics analysis indicated high temperature (T > 25 °C, low relative humidity (RH < 60%), and low wind speed (WS < 3 m/s) were favorable for O3 formation and accumulation, and the O3 pollution days (MDA8 O3 > 160 µg/m3) were predominantly observed when the wind was traveling from the easterly and southerly. O3 concentration in urban area of Yulin was higher than that in background. The pollution air masses from Fenwei Plain increase the level and duration of O3 pollution. In order to clarify the formation mechanism and source of O3, online measurements of volatile organic compounds (VOCs) were conducted from 7 July to 10 August in 2019. The average of VOCs concentration was 26 ± 12 ppbv, and large amounts of alkenes followed by aromatics, characteristic pollutants of the coal chemical industry, were detected in the ambient air. To further measure the sensitivity, the observation-based model (OBM) simulation was conducted. Empirical Kinetic Modeling Approach (EKMA) plot and relative incremental reactivity (RIR) value indicated Yulin located on VOCs-limited regime. That implied a slight decrease of NOx may increase O3 concentration. When the emission reduction ratio of anthropogenic VOCs/NOx higher than 1:1, the O3 will decrease. O3 control strategies analysis shows that the O3 targets of 5% and 10% O3 concentration reductions are achievable through precursor control, but more effort is needed to reach the 30% and 40% reduction control targets.

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Preparation of hypercrosslinked polymers with cashew nut shell liquid for removal of volatile organic compounds

Liu

Wang

et al. 2022

Polymer Engineering & Sci

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Hypercrosslinked polymers (HCPs) have aroused considerable attention due to their high chemical stability and potential applications in adsorption. A series of HCPs were prepared via one-step solvent knitting method using the cashew nut shell liquid (CNSL) as bio-based building block. Characterization of the prepared samples was performed by N 2 adsorption, Fourier transform infrared, Raman spectra, solid-state 13 C NMR spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy, and transmission electron microscopy images. Depending on the N 2 adsorption, the as-prepared CNSL-HCP4 exhibits the highest specific surface area of 93 m 2 Ág À1 and displays a uniform pore-size distribution. TGA results show that the decomposition temperature of the polymers exceeds 350 C. More significantly, the dynamic adsorption of high concentration of volatile organic compounds (VOCs) was investigated with CNSL-HCP4 under dry and humid conditions. The results show that the maximum adsorption capacity of o-xylene under dry conditions is 217 mgÁg À1 and its corresponding adsorption amount (208 mgÁg À1 ) decreases slightly under 30% relative humidity condition, indicating that CNSL-HCP4 had a hydrophobic surface. A little decrease in adsorption capacity of o-xylene on CNSL-HCP4 after five recycles confirms the reusability of the CNSL-HCPs. Therefore, CNSL-HCP4 is considered to be a promising candidate for potential adsorbent in recycling the VOCs from the exhaust.

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Source apportionments of atmospheric volatile organic compounds in Nanjing, China during high ozone pollution season

Cited by 75 publications

References 56 publications

Peer Review #1 of "Ambient ozone pollution at a coal chemical industry city in the border of Loess Plateau and Mu Us Desert: characteristics, sensitivity analysis and control strategies (v0.1)"

Peer Review #1 of "Ambient ozone pollution at a coal chemical industry city in the border of Loess Plateau and Mu Us Desert: characteristics, sensitivity analysis and control strategies (v0.1)"

Ambient ozone pollution at a coal chemical industry city in the border of Loess Plateau and Mu Us Desert: characteristics, sensitivity analysis and control strategies

Preparation of hypercrosslinked polymers with cashew nut shell liquid for removal of volatile organic compounds

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