Petrochemical and Industrial Sources of Volatile Organic Compounds Analyzed via Regional Wind-Driven Network in Shanghai

Qiu, Wanyi; Li, Shule; Liu, Yuhan; Lu, Keding

doi:10.3390/atmos10120760

Cited by 9 publications

(4 citation statements)

References 55 publications

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“…The origins of VOCs include inappropriate industrial waste management, biofuel production, combustion of fossil fuels, emissions from vehicles, and release from oil storage containers. A substantial contribution of VOC emission comes from the petroleum and chemical industries [3,4]. Notably, the leakage from underground storage tanks and inadequate emission management in the petrochemical plants can directly contaminate soil and groundwater, gradually spreading VOCs from the sources.…”

Section: Introductionmentioning

confidence: 99%

Diffusion-Based Continuous Real-Time Monitoring System for Total Volatile Organic Compounds

Hong,

Kim

2024

Atmosphere

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In this study, a total volatile organic compound (TVOC) monitoring system was developed and employed for the continuous and real-time monitoring of TVOCs. Gas chromatography (GC) coupled with thermal desorption (TD) and a commercially available portable VOC detector were simultaneously applied to verify the performance of the developed system. Since the developed system was applicable with and without a pump, the effect of the pump on the monitoring performance was also investigated. Overall, the reliable accuracy and precision of the developed TVOC monitoring system were verified in the TVOC concentration of 50~5000 ppbv. Based on the simultaneous analysis with TD-GC, the TVOC monitoring system showed nearly identical performance to the TD-GC system regardless of the presence of the pump. When compared to the commercially available and portable VOC detector equipped with an internal pump, the maximum delayed response of the TVOC monitoring system was 15 min. In the VOC transport in soil, the breakthrough curve was successfully obtained compared to the case with the TD-GC system. Considering the measurement frequency of the TD-GC system, the TVOC monitoring system as a passive monitoring device can be effectively applied to the subsurface area with the TVOC concentration at or above 50 ppbv.

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Section: Introductionmentioning

confidence: 99%

Diffusion-Based Continuous Real-Time Monitoring System for Total Volatile Organic Compounds

Hong,

Kim

2024

Atmosphere

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“…At the ground level, photochemical reactions of nitrogen oxides (NOx) and volatile organic compounds (VOC) are essential factors contributing to O3 production in the presence of sunlight (Qiu et al, 2019). Ground-level O3 has been investigated give harmful effects on animals and plants (Unger et al, 2020;Zhang et al, 2021) and caused climate change (Schnell, 2016).…”

Section: Introductionmentioning

confidence: 99%

Drivers of nocturnal interactions between ground-level ozone and nitrogen dioxide

2023

Global NEST: The International Journal

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<p>This study analyses nighttime (7 p.m. to 6 a.m.) light pollution effects on ground-level ozone production in urban and sub-urban sites in Malaysia. In the absence of solar radiation, no photochemical reaction will occur during nighttime, resulting in zero readings of ground-level ozone (O3). O3 and nitrogen dioxide (NO2) data collected in 2020 were analysed to assess time series and diurnal variability at each site and between sites. The highest nighttime mean O3 concentration is Minden (60 ppb); meanwhile, for nighttime mean NO2 concentrations, the highest is Klang (43 ppb). The results show that sub-urban experienced higher O3 variations compared to urban areas. The monthly mean nighttime O3 and NO2 in urban and suburban areas display a gradual increase in O3 and NO2 variations from March to April, followed by a decreasing trend in the mid of the year. These variations in monthly air pollutants are related to the MCO, CMCO, and RMCO in Malaysia during 2020. Putrajaya (sub-urban site) was the darkest site (average lux: 20) for the whole dataset. In contrast, Minden (sub-urban site) was recorded as the brightest site with maximum light pollution (average lux: 70). The relationship between O3 and NO2 shows a negative correlation during nighttime for urban and suburban sites. Light pollution can reach levels that might affect nocturnal O3 and NO2 concentrations; therefore, the long-term variability of light pollution is essential for air pollution studies.</p>

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“…In the troposphere, the photochemical reactions of nitrogen oxides (NO x ) and volatile organic compounds (VOCs) act as major yield factors for ozone (O 3 ) [1]. In addition, regional transport and tropospheric intrusion also contribute to stratospheric O 3 levels [2].…”

Section: Introductionmentioning

confidence: 99%

Clustering Analysis on Drivers of O3 Diurnal Pattern and Interactions with Nighttime NO3 and HONO

Wang

Zhang

et al. 2022

Atmosphere

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The long-path differential optical absorption spectroscopy (LP-DOAS) technique was deployed in Shanghai to continuously monitor ozone (O3), formaldehyde (HCHO), nitrogen dioxide (NO2), nitrous acid (HONO), and nitrate radical (NO3) mixing ratios from September 2019 to August 2020. Through a clustering method, four typical clusters of the O3 diurnal pattern were identified: high during both the daytime and nighttime (cluster 1), high during the nighttime but low during the daytime (cluster 2), low during both the daytime and nighttime (cluster 3), and low during the nighttime but high during the daytime (cluster 4). The drivers of O3 variation for the four clusters were investigated for the day- and nighttime. Ambient NO caused the O3 gap after midnight between clusters 1 and 2 and clusters 3 and 4. During the daytime, vigorous O3 generation (clusters 1 and 4) was found to accompany higher temperature, lower humidity, lower wind speed, and higher radiation. Moreover, O3 concentration correlated with HCHO for all clusters except for the low O3 cluster 3, while O3 correlated with HCHO/NOx, but anti-correlated with NOx for all clusters. The lower boundary layer height before midnight hindered O3 diffusion and accordingly determined the final O3 accumulation over the daily cycle for clusters 1 and 4. The interactions between the O3 diel profile and other atmospheric reactive components established that higher HONO before sunrise significantly promoted daytime O3 generation, while higher daytime O3 led to a higher nighttime NO3 level. This paper summarizes the interplays between day- and nighttime oxidants and oxidation products, particularly the cause and effect for daytime O3 generation from the perspective of nighttime atmospheric components.

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Petrochemical and Industrial Sources of Volatile Organic Compounds Analyzed via Regional Wind-Driven Network in Shanghai

Cited by 9 publications

References 55 publications

Diffusion-Based Continuous Real-Time Monitoring System for Total Volatile Organic Compounds

Diffusion-Based Continuous Real-Time Monitoring System for Total Volatile Organic Compounds

Drivers of nocturnal interactions between ground-level ozone and nitrogen dioxide

Clustering Analysis on Drivers of O3 Diurnal Pattern and Interactions with Nighttime NO3 and HONO

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