Photochemical oxidation of o-dichlorobenzene in aqueous solution by hydroxyl radicals from nitrous acid

Hu, Yadong; Ma, Jianzhong; Zhu, Mengyu; Zhao, Yijun; Peng, Shuchuan; Zhu, Chengzhu

doi:10.1016/j.jphotochem.2021.113503

Cited by 3 publications

(1 citation statement)

References 63 publications

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“…Due to its long lifetime, dichlorobenzene can be transported to upper regions of the atmosphere where some release of some reactive chlorine through photolysis can occur, but this is not likely to be of large consequence. Instead, reaction with hydroxyl radicals would convert it more readily to phenolic compounds that would readily partition to aqueous aerosol phase and also undergo nitration to form nitrophenolics (Hu et al, 2021), which are a component of brown carbon (Lin et al 2015(Lin et al , 2017.…”

Section: 4: Discovery Of Methanethiol (Ch3sh) Dichlorobenzenes (C6h4c...mentioning

confidence: 99%

Discovery of reactive chlorine, sulphur and nitrogen containing ambient volatile organic compounds in the megacity of Delhi during both clean and extremely polluted seasons

Mishra,

Sinha,

Hakkim

et al. 2024

Preprint

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Abstract. Volatile organic compounds significantly impact the atmospheric chemistry of polluted megacities. Delhi is a dynamically changing megacity and yet our knowledge of its ambient VOC composition and chemistry is limited to few studies conducted mainly in winter before 2020 (all pre-covid). Here, using a new extended volatility range high mass resolution (10000–15000) Proton Transfer Reaction Time of Flight Mass Spectrometer10K, we measured and analyzed ambient VOC-mass spectra acquired continuously over a four-month period covering “clean” monsoon (July–September) and “polluted” post-monsoon seasons, for the year 2022. Out of 1126 peaks, 111 VOC species were identified unambiguously. Averaged total mass concentrations reached ~260 µgm-3 and were >4 times in polluted season relative to cleaner season, driven by enhanced emissions from biomass burning and reduced atmospheric ventilation (~2). Among 111, 56 were oxygenated, 10 contained nitrogen, 2 chlorine, 1 sulphur and 42 were pure hydrocarbons. VOC levels during polluted periods were significantly higher than most developed world megacities. Surprisingly, methanethiol, dichlorobenzenes, C6-amides and C9-organic acids/esters, which have previously never been reported in India, were detected in both the clean and polluted periods. The sources were industrial for methanethiol and dichlorobenzenes, purely photochemical for the C6-amides and multiphase oxidation and partitioning for C9-organic acids. Aromatic VOC/CO emission ratio analyses indicated additional biomass combustion/industrial sources in post-monsoon season, alongwith year-round traffic sources in both seasons. Overall, the unprecedented new information concerning ambient VOC speciation, abundance, variability and emission characteristics during contrasting seasons significantly advances current atmospheric composition understanding of highly polluted urban atmospheric environments like Delhi.

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Section: 4: Discovery Of Methanethiol (Ch3sh) Dichlorobenzenes (C6h4c...mentioning

confidence: 99%

Discovery of reactive chlorine, sulphur and nitrogen containing ambient volatile organic compounds in the megacity of Delhi during both clean and extremely polluted seasons

Mishra,

Sinha,

Hakkim

et al. 2024

Preprint

View full text Add to dashboard Cite

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Synergistic degradation of oxytetracycline and rhodamine B in Cu(II)/peroxymonosulfate process: Two distinct oxidation mechanisms

Ou,

Liu,

Zhang

et al. 2024

Journal of Environmental Chemical Engineering

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Reactive chlorine-, sulfur-, and nitrogen-containing volatile organic compounds impact atmospheric chemistry in the megacity of Delhi during both clean and extremely polluted seasons

Mishra,

Sinha,

Hakkim

et al. 2024

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. Volatile organic compounds (VOCs) significantly impact the atmospheric chemistry of polluted megacities. Delhi is a dynamically changing megacity, and yet our knowledge of its ambient VOC composition and chemistry is limited to few studies conducted mainly in winter before 2020 (all pre-COVID-19). Here, using a new extended volatility range high-mass-resolution (10 000–15 000) proton transfer reaction time-of-flight mass spectrometer, we measured and analysed ambient VOC mass spectra acquired continuously over a 4-month period, covering “clean” monsoon (July–September) and “polluted” post-monsoon seasons, for the year 2022. Out of 1126 peaks, 111 VOC species were identified unambiguously. Averaged total mass concentrations reached ∼ 260 µg m−3 and were > 4 times in the polluted season relative to the cleaner season, as driven by enhanced emissions from biomass burning and reduced atmospheric ventilation (∼ 2). Among 111, 56 were oxygenated, 10 contained nitrogen, 2 chlorine, 1 sulfur, and 42 were pure hydrocarbons. VOC levels during polluted periods were significantly higher than most developed world megacities. Methanethiol, dichlorobenzenes, C6 amides, and C9 organic acids/esters, which have previously never been reported in India, were detected in both the clean and polluted periods. The sources were industrial for methanethiol and dichlorobenzenes, purely photochemical for the C6 amides, and multiphase oxidation and partitioning for C9 organic acids. Aromatic VOC / CO emission ratio analyses indicated additional biomass combustion/industrial sources in the post-monsoon season, along with year-round traffic sources in both seasons. Overall, the unprecedented new information concerning ambient VOC speciation, abundance, variability, and emission characteristics during contrasting seasons significantly advances current atmospheric composition understanding of highly polluted urban atmospheric environments like Delhi.

show abstract

Photochemical oxidation of o-dichlorobenzene in aqueous solution by hydroxyl radicals from nitrous acid

Cited by 3 publications

References 63 publications

Discovery of reactive chlorine, sulphur and nitrogen containing ambient volatile organic compounds in the megacity of Delhi during both clean and extremely polluted seasons

Discovery of reactive chlorine, sulphur and nitrogen containing ambient volatile organic compounds in the megacity of Delhi during both clean and extremely polluted seasons

Synergistic degradation of oxytetracycline and rhodamine B in Cu(II)/peroxymonosulfate process: Two distinct oxidation mechanisms

Reactive chlorine-, sulfur-, and nitrogen-containing volatile organic compounds impact atmospheric chemistry in the megacity of Delhi during both clean and extremely polluted seasons

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