Study on pollution behavior and sulfate formation during the typical haze event in Nanjing with water soluble inorganic ions and sulfur isotopes

Guo, Ziyan; Guo, Qingjun; Chen, Shanli; Zhu, Bin; Zhang, Yanlin; Yu, Jianguo; Guo, Zhaobing

doi:10.1016/j.atmosres.2018.11.009

Cited by 39 publications

(25 citation statements)

References 60 publications

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“…The levels of these substances were not high during the sampling period and decreased to varying degrees after rain. It is similar to Liu and Zhang et al who concluded that biomass burning, coal combustion, and dust storms were not major sources of pollution in Nanjing during the summer (Guo et al, 2019;Liu et al, 2019;Zhang et al, 2020). In addition, there was no strong correlation between DTTV and SO2, NOx, NO2, and CO before and after the rain.…”

Section: The Correlation Between Pm25 and Polluting Gases And Ros Activitysupporting

confidence: 86%

Development, characterization and application of an improved online reactive oxygen species analyzer based on MARGA

Yang

Cao

et al. 2022

Preprint

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Abstract. Excessive reactive oxygen species (ROS) in the human body is an important factor leading to diseases. Therefore, research on the content of reactive oxygen species in atmospheric particles is necessary. In order to more conveniently and accurately detect the content of reactive oxygen in atmospheric particles hour by hour. Here, to modify the instrument, it is added a DTT experimental module that is protected from light and filled with nitrogen at the end, based on the Monitor for AeRosols and Gases in ambient Air (MARGA). The experimental study found that the detection limit of the modified instrument is 0.024 nmol min−1. And the accuracy of the online instrument is determined by comparing the online and offline levels of the samples, which yielded good consistency (slope 0.97, R2 = 0.95). It shows that the performance of the instrument is indeed optimized, the instrument is stable, and the characterization of ROS is accurate. Meanwhile, reactive oxygen and inorganic ions in atmospheric particles are quantified using the online technique in the northern suburbs of Nanjing. It is found that the content of ROS during the day is higher than that at night, especially after it rains, ROS peaks appear in the two time periods of 08:00–10:00 and 16:00–18:00. In addition, examination of the online ROS and water-soluble ions (SO42−, NO3−, NH4+, Na+, Ca2+, K+), BC and polluting gases (SO2, CO, O3, NO, NOx) measurements revealed that photo-oxidation and secondary formation processes could be important sources of aerosol ROS. This method breakthrough enables the quantitative assessment of atmospheric particulate matter ROS at the diurnal scale, providing an effective tool to study sources and environmental impacts of ROS.

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Section: The Correlation Between Pm25 and Polluting Gases And Ros Activitysupporting

confidence: 86%

Development, characterization and application of an improved online reactive oxygen species analyzer based on MARGA

Yang

Cao

et al. 2022

Preprint

Self Cite

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“…Feng et al [11] reported that nitrate aerosol was the main contributor to particulate pollution in Beijing, and the mass fraction of nitrate in PM 2.5 ranged from 20.1% to 28.9% from 2013 to 2015. Guo et al [12] observed that the proportion of sulfate in PM 2.5 ranged from 28.2% to 50.5% in Nanjing in 2015. The secondary air pollutants generated by the reaction of the primary pollutants also exert considerable effects on regional environmental quality and human health [13,14].…”

Section: Introductionmentioning

confidence: 99%

Quantifying Air Pollutant Variations during COVID-19 Lockdown in a Capital City in Northwest China

Feng

Wang

et al. 2021

Atmosphere

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In the context of the outbreak of coronavirus disease 2019 (COVID-19), strict lockdown policies were implemented to control nonessential human activities in Xi’an, northwest China, which greatly limited the spread of the pandemic and affected air quality. Compared with pre-lockdown, the air quality index and concentrations of PM2.5, PM10, SO2, and CO during the lockdown reduced, but the reductions were not very significant. NO2 levels exhibited the largest decrease (52%) during lockdown, owing to the remarkable decreased motor vehicle emissions. The highest K+ and lowest Ca2+ concentrations in PM2.5 samples could be attributed to the increase in household biomass fuel consumption in suburbs and rural areas around Xi’an and the decrease in human physical activities in Xi’an (e.g., human travel, vehicle emissions, construction activities), respectively, during the lockdown period. Secondary chemical reactions in the atmosphere increased in the lockdown period, as evidenced by the increased O3 level (increased by 160%) and OC/EC ratios in PM2.5 (increased by 26%), compared with pre-lockdown levels. The results, based on a natural experiment in this study, can be used as a reference for studying the formation and source of air pollution in Xi’an and provide evidence for establishing future long-term air pollution control policies.

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“…Ion chromatography has the advantages of high speed and good separation efficiency, it thus is widely used for the determination of water soluble ions in PM 2.5 . For example, a study on water soluble ions in PM 2.5 using ion chromatography, with detection limit of each ion lower than 0.015 µg m −3 , showed that the secondary sulfate was ascribed to aqueous phase sulfur oxidation promoted by high concentration NO 2 and high relative humidity (Guo et al 2019 ). Seasonal variability of NH 4 + and NO 3 − is governed by dissociation of NH 4 NO 3 under high temperature in summer (Qiao et al 2019 ).…”

Section: Detection Methods For Pm 25 Chemical Comp...mentioning

confidence: 99%

Recent Developments in the Determination of PM2.5 Chemical Composition

Pan¹,

Qiu

et al. 2022

Bull Environ Contam Toxicol

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Fine particulate matter (named PM 2.5 ) has become a prominent and dangerous form of air pollution. The chemical composition of PM 2.5 mainly includes inorganic elements, water soluble ions, elemental carbon (EC), organic carbon (OC), and organic compounds. The detection method for inorganic elements mainly includes X ray fluorescence, inductively coupled plasma-atomic emission spectrometry, and inductively coupled plasma mass spectrometry. As for water soluble ions, ion chromatography is the most common detection method. EC and OC are usually detected by carbon analyzer. The organic compounds are determined by gas chromatography–mass spectrometry and liquid chromatography–mass spectrometry. In this paper, the merits and drawbacks of each analytical methods for the determination of PM 2.5 chemical composition are summarized. This review also includes our discussion on the improvement of the analytical accuracy for the determination of PM 2.5 chemical composition owing to the development of reference materials.

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Study on pollution behavior and sulfate formation during the typical haze event in Nanjing with water soluble inorganic ions and sulfur isotopes

Cited by 39 publications

References 60 publications

Development, characterization and application of an improved online reactive oxygen species analyzer based on MARGA

Development, characterization and application of an improved online reactive oxygen species analyzer based on MARGA

Quantifying Air Pollutant Variations during COVID-19 Lockdown in a Capital City in Northwest China

Recent Developments in the Determination of PM2.5 Chemical Composition

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