Photolysis frequency of nitrophenols derived from ambient measurements

Yan, Peng; Yuan, Bin; Yang, Suxia; Wang, Sihang; Yang, Xiaoyun; Wang, Wenjie; Li, Jin; Song, Xin; Wu, Changzhi; Qi, Jianhua; Zheng, E; Ye, Chenshuo; Huang, Shan; Hu, Weiwei; Song, Wei; Wang, Xinming; Wang, Baolin; Shao, Min

doi:10.1016/j.scitotenv.2023.161810

Cited by 3 publications

(4 citation statements)

References 60 publications

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“…In the summer season, the simulated and observed secondary mono‐NPs matched with each other during daytime when we adopted the photolysis frequency of C 6 H 5 NO 3 and C 7 H 7 NO 3 as 7.5% of jNO 2 (Figure 7). This result is similar to a previous study which derived observation‐constrained photolysis frequency of C 6 H 5 NO 3 and C 7 H 7 NO 3 as 3.5% and 2.4% of jNO 2 , respectively (Peng et al., 2023). Then, we fixed the photolysis frequency of C 6 H 5 NO 3 and C 7 H 7 NO 3 , changed the photolysis frequency of di‐NPs from 0.5% to 25% of jNO 2 , and reran the model to simulate the diurnal pattern of di‐NPs.…”

Section: Resultssupporting

confidence: 92%

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Observations and Modeling of Gaseous Nitrated Phenols in Urban Beijing: Insights From Seasonal Comparison and Budget Analysis

Xia,

Chen,

et al. 2023

JGR Atmospheres

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Nitrated phenols (NPs) are critical components of brown carbon with climate effects and threaten human health and ecosystems. Early studies mainly focus on particulate NPs, while the sources and impacts of gas‐phase NPs remain less known. This study observed 17 kinds of gaseous NPs in urban Beijing during winter and summer by nitrate‐based long‐time‐of‐flight chemical ionization mass spectrometer (NO3−‐LToF‐CIMS). NPs have an apparent seasonal variation and various diurnal patterns among different species. Source apportionment indicates that secondary productions are the major sources of NPs, besides minor contributions from coal burning and regional industrial emissions. As shown by the observation and box modeling, NO3‐initiated nocturnal oxidation and OH‐driven photochemistry are the secondary sources of NPs. In both seasons, photolysis constitutes the dominating removal pathway of NPs. We determined the observation‐constrained photolysis frequency of typical NPs (i.e., C6H5NO3, C7H7NO3, C6H4N2O5, and C7H6N2O5), ranging from 1.75% to 7.5% of jNO2. Budget analysis reveals that benzaldehyde produced by styrene oxidation is a critical but overlooked precursor of C6H5NO3, and xylene is an essential precursor for C7H7NO3. Modeling results further show that the photolysis of total NPs produces significant amounts of HONO in summer, making noticeable contributions to atmospheric oxidation capacity. This study contributes to a better understanding of the budget of gaseous NPs in the urban atmosphere and provides insights into mitigating NPs‐induced secondary pollution.

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Section: Resultssupporting

confidence: 92%

“…As the photolysis of typical NPs has significant uncertainties according to current knowledge, we adopted different photolysis frequencies of NPs (0.5%∼25% of jNO 2 ) and see which one matches with observations. The same method was utilized in a previous study (Peng et al., 2023).…”

Section: Resultsmentioning

confidence: 99%

Observations and Modeling of Gaseous Nitrated Phenols in Urban Beijing: Insights From Seasonal Comparison and Budget Analysis

Xia,

Chen,

et al. 2023

JGR Atmospheres

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“…Both atmospheric lifetimes are much longer than those observed for the gas-phase photolysis of NPs, which were determined in the order of minutes (Peng et al, 2023).…”

Section: Kineticsmentioning

confidence: 79%

“…In a recent field study conducted in an urban environment, however, a minor role has been attributed to this second pathway (Cheng et al, 2021). Moreover, very recently, photolysis frequency of selected gas-phase NPs has been estimated from ambient measurements, resulting in their atmospheric lifetimes in the order of minutes (Peng et al, 2023), which contradicts the general belief that they are long-lived in the atmosphere. Finally, it has been shown that direct photolysis is the dominant degradation pathway of gas-phase o-NP in the atmosphere, corresponding to the photolysis lifetimes in the order of minutes compared with the estimated atmospheric • OH radical reaction lifetime of 193 h (Sangwan and Zhu, 2016).…”

Section: Introductionmentioning

confidence: 96%

Kinetics and product identification of water-dissolved nitroguaiacol photolysis under artificial sunlight

Delić,

Skube,

Šala

et al. 2023

Front. Chem.

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Nitroguaiacols are typical constituents of biomass-burning emissions, including absorbing aerosols which contribute to climate change. Although they are also harmful to humans and plants, their atmospheric fate and lifetimes are still very speculative. Therefore, in this work, the photolysis kinetics of aqueous-phase 4-nitroguaiacol (4NG) and 5-nitroguaiacol (5NG), and the resulting photo-formed products were investigated under artificial sunlight, observing also the effect of sunlight on the absorption properties of the solutions. We found the photolysis of 5NG slower than that of 4NG, whereas the absorbance in the visible range prevailed in the 5NG solutions at the end of experiments. Although we identified dinitroguaiacol as one of the 4NG photolysis products, which increased light absorption of 4NG-containing solutions, considerably more chromophores formed in the 5NG photolyzed solutions, implying its stronger potential for secondary BrC formation in the atmosphere. In general, denitration, carbon loss, hydroxylation, nitration, and carbon gain were characteristic of 4NG phototransformation, while carbon loss, hydroxylation, and carbon gain were observed in the case of 5NG. The photolysis kinetics was found of the first order at low precursor concentrations (<0.45 mM), resulting in their lifetimes in the order of days (125 and 167 h illumination for 4NG and 5NG, respectively), which suggests long-range transport of the investigated compounds in the atmosphere and proposes their use as biomass-burning aerosol tracer compounds.

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Source apportionment of gaseous Nitrophenols and their contribution to HONO formation in an urban area

et al. 2023

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Photolysis frequency of nitrophenols derived from ambient measurements

Cited by 3 publications

References 60 publications

Observations and Modeling of Gaseous Nitrated Phenols in Urban Beijing: Insights From Seasonal Comparison and Budget Analysis

Observations and Modeling of Gaseous Nitrated Phenols in Urban Beijing: Insights From Seasonal Comparison and Budget Analysis

Kinetics and product identification of water-dissolved nitroguaiacol photolysis under artificial sunlight

Source apportionment of gaseous Nitrophenols and their contribution to HONO formation in an urban area

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