Seasonal behavior of water-soluble organic nitrogen in fine particulate matter (PM2.5) at urban coastal environments in Hong Kong

Ho, Steven Sai Hang; Li, Lijuan; Qu, Linli; Cao, Junji; Lui, Ka Hei; Niu, Xinyi; Lee, Shuncheng; Ho, Kin Fai

doi:10.1007/s11869-018-0654-5

Cited by 11 publications

(7 citation statements)

References 51 publications

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“…The (IA) 4 (DEA) 3 cluster was set as the boundary cluster and allowed to contribute to the cluster formation rate (see details in the Supporting Information). The [IA] and [DEA] were set to 10 5 , 10 6 , 10 7 , and 10 8 cm –3 , ,, and 2.5 × 10 5 , 2.5 × 10 6 , 2.5 × 10 7 , 2.5 × 10 8 , and 5 × 10 8 cm –3 , − respectively, corresponding to their atmospheric concentration ranges. Similar to a previous study, the setting values of [IA] are the initial concentrations of the IA monomer.…”

Section: Methodsmentioning

confidence: 99%

Enhancement of Atmospheric Nucleation Precursors on Iodic Acid-Induced Nucleation: Predictive Model and Mechanism

Xie

Zhang

et al. 2023

Environ. Sci. Technol.

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Iodic acid (IA) has recently been recognized as a key driver for new particle formation (NPF) in marine atmospheres. However, the knowledge of which atmospheric vapors can enhance IA-induced NPF remains limited. The unique halogen bond (XB)-forming capacity of IA makes it difficult to evaluate the enhancing potential (EP) of target compounds on IA-induced NPF based on widely studied sulfuric acid systems. Herein, we employed a three-step procedure to evaluate the EP of potential atmospheric nucleation precursors on IA-induced NPF. First, we evaluated the EP of 63 precursors by simulating the formation free energies (ΔG) of the IA-containing dimer clusters. Among all dimer clusters, 44 contained XBs, demonstrating that XBs are frequently formed. Based on the calculated ΔG values, a quantitative structure–activity relationship model was developed for evaluating the EP of other precursors. Second, amines and O/S-atom-containing acids were found to have high EP, with diethylamine (DEA) yielding the highest potential to enhance IA-induced nucleation by combining both the calculated ΔG and atmospheric concentration of considered 63 precursors. Finally, by studying larger (IA)1–3(DEA)1–3 clusters, we found that the IA-DEA system with merely 0.1 ppt (2.5×106 cm–3) DEA yields comparable nucleation rates to that of the IA–iodous acid system.

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Section: Methodsmentioning

confidence: 99%

Enhancement of Atmospheric Nucleation Precursors on Iodic Acid-Induced Nucleation: Predictive Model and Mechanism

Xie

Zhang

et al. 2023

Environ. Sci. Technol.

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“…A total of 64 PM2.5 samples were analyzed to determine the target NOCs in this study. Amines and amino acids were quantified with the derivatization and analytical procedures by the Waters' AccQ-Tag method (Cohen and Michaud, 1993;Ho et al, 2015;Ho et al, 2019). For sample extraction, a 4.3 cm 2 filter was cut into pieces and subjected to ultrasonic extraction with 5 mL of Milli-Q water (18 MΩ cm) twice in a water bath at 25 °C.…”

Section: Nocs Analysismentioning

confidence: 99%

“…Urea was identified and quantified using a direct injection method on an HPLC system coupled with a photodiode array detector (DAD) (1200 Series, Agilent Technology). The separation of urea was achieved using a 4.6 × 150 mm C18 column (4-μm particle size, Cogent Bidentate), and its detection was performed at an absorption wavelength of 210 nm (Ho et al, 2019). The calibration of the method exhibited a high correlation coefficient (R 2 > 0.999), indicating a strong linear relationship between the concentration of urea and the detector response.…”

Section: Nocs Analysismentioning

confidence: 99%

“…Over the past decade, studies on NOCs have primarily focused on identifying their sources and concentrations (Song et al, 2017;Boreson et al, 2004;Barbaro et al, 2015;Lin et al, 2021). More than 200 NOCs have been detected in the atmosphere, originating from a variety of natural sources such as animals, vegetation, ocean, and husbandry, as well as anthropogenic sources including sewage treatment, combustion processes, vehicle emissions, and industrial activities (Zhu et al, 2020;Zhang and Anastasio, 2003b;Shi et al, 2010;Ho et al, 2019;Wang et al, 2022). Determining the sources of NOCs in the atmosphere remains challenging.…”

Section: Introductionmentioning

confidence: 99%

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Comment on egusphere-2024-1130

2024

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“…spring, summer, and winter), demonstrating that ambient carbonaceous aerosols (soot in the study) were derived principally from coal combustion, especially in winter. With the development of analytical techniques and in-depth research on carbonaceous aerosols, a number of studies on carbonaceous aerosols have emerged in many Chinese cities, such as Beijing (He et al, 2001;Zhang et al, 2007;Ji et al, 2019), Xi'an (Cao et al, 2005;Han et al, 2009;Shen et al, 2014), Chengdu (Wang et al, 2013;Tao et al, 2013), Shanghai (Cao et al, 2013;Zhu et al, 2015;Li et al, 2019), Guangzhou (Cao et al, 2004;Ho et al, 2014;, and Hong Kong (Lee et al, 2006;Ho et al, 2002Ho et al, , 2019. However, long-term (e.g.…”

Section: Introductionmentioning

confidence: 99%

Measurement report: Characterisation and sources of the secondary organic carbon in a Chinese megacity over 5 years from 2016 to 2020

Wang

Duan

et al. 2022

Atmos. Chem. Phys.

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Abstract. To investigate impact factors and source area of secondary organic aerosols in the Yangtze River Delta (YRD) region, a world-class urban agglomeration in China, long-term measurements of organic carbon (OC) and elementary carbon (EC) in particulate matter of less than 2.5 µm (PM2.5) with hourly time resolution were conducted at a regional site in Shanghai from 2016 to 2020. Based on the 5-year measurements, the interannual, monthly, seasonal, and diurnal variations in OC and EC, as well as OC subtypes, i.e. secondary OC (SOC) and primary OC (POC), apportioned by the novel statistical model of the minimum R2 method, and the formation pathways of SOC, are presented. By examining the relationship between SOC and temperature, as well as relative humidity (RH), we show that SOC formation is greatly enhanced at high temperatures (> 30 ∘C), whereas it correlates inversely with RH. In particular, we show that the photochemical formation of SOC is the major formation pathway even in winter, when solar radiation was supposedly less intense than in summer, which is different from that in the north China plain, where aqueous phase chemistry is found to be an important SOC formation pathway. Moreover, increased SOC concentrations are also found to be associated with high wind speed (> 5 m s−1) in winter, which is increased by 29.1 % (2.62 µg m−3) when compared with that during lower winds, suggesting regional sources of SOC in winter. By analysing the potential source regions using the concentration-weighted trajectory (CWT), the geographic regions of SOC are found to be mainly associated with transport from outside Shanghai (SOC > 3.5 µg m−3) including central and southern Anhui, Zhejiang, and Fujian. The results from this study provide critical information about the long-term trend of carbonaceous aerosol, in particular, SOC, in one of the largest megacities in the world, and are helpful for developing pollution control measures from a long-term planning perspective.

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Seasonal behavior of water-soluble organic nitrogen in fine particulate matter (PM2.5) at urban coastal environments in Hong Kong

Abstract: Manuscript revisedClick here to access/download;Manuscript;Hoetal_NitrogenHK_Revision2.d Click here to view linked References This is the Pre-Published Version.

Cited by 11 publications

References 51 publications

Enhancement of Atmospheric Nucleation Precursors on Iodic Acid-Induced Nucleation: Predictive Model and Mechanism

Enhancement of Atmospheric Nucleation Precursors on Iodic Acid-Induced Nucleation: Predictive Model and Mechanism

Comment on egusphere-2024-1130

Measurement report: Characterisation and sources of the secondary organic carbon in a Chinese megacity over 5 years from 2016 to 2020

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