Characterization of PM2.5 Carbonaceous Particles with a High-Efficiency SEM: A Case Study at a Suburban Area of Xi’an

Wang, Meixia; Hu, Taotao; Wu, Feng; Duan, Jing; Song, Yingpan; Zhu, Yuqing; Xue, Chenxin; Zhang, Daizhou

doi:10.1007/s41810-020-00085-z

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…Amongst the various PM characteristics, PM mass, number, and size are vital parameters for research. Particles have a high retention time in the atmosphere causing high risk to the human respiratory system (Wang et al 2021). PM physical, and PM chemical properties affect soot.…”

Section: Introductionmentioning

confidence: 99%

Characterization from Diesel and Renewable Fuel Engine Exhaust: Particulate Size/Mass Distributions and Optical Properties

et al. 2023

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Combustion of fossil fuel produces emissions and is one of the major environmental problems leading to climate change. Diesel engines are highly efficient but produce particulate emissions. These particulate emissions are considered dangerous to human health because inhaling particulates may cause respiratory and heart disease. Substituting fossil diesel fuel with renewable diesel fuel and using diesel particulate filters is one possibility to meet stringent legislative requirements. With this motivation, the present experimental investigation aimed to evaluate the particle size distribution (PSD), optical properties of particulate matter (PM) emitted, and the outcome of using an after-treatment system comprising of a diesel particle filter (DPF). This investigation aimed to make a comparative analysis of particulate emission upstream and downstream of the DPF with and without ultraviolet (UV) light (405 nm and 781 nm wavelength) turned on/off. Experiments were performed at (a) engine idle with a torque of 6 Nm at 750 rpm, IMEP of 1.35 bar and power of 0.5 kW, (b) engine at part load with a torque of 32 Nm at 1200 rpm, IMEP of 8.5 bar and power of 4.5 kW. Diesel engine was operated on two fuels (a) Diesel and (b) EHR7. Results showed that as and when UV light was turned on, a distinct nucleation mode that dominated the number concentration for both test fuels were observed. Downstream of the filter had relatively higher AAE values which show the contribution to climate change. Present experimental research is important for renewable fuel industries, industrial innovation's future, and the exhaust gas after-treatment system (EATS) community. The results contribute to knowledge for occupational exposure, human health, and the environment.

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Section: Introductionmentioning

confidence: 99%

Characterization from Diesel and Renewable Fuel Engine Exhaust: Particulate Size/Mass Distributions and Optical Properties

et al. 2023

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“…To better understand the influence of SO 2 on particle composition, individual particles (d a , 0.32-0.56 μm) within PM 2.5 from each case study day were analyzed using CCSEM-EDX. Five main types of particles were identified across the two case study days based on the elemental composition: carbonaceous (which can include both organic carbon and soot, as these are not differentiated using EDX), ,,, Ca-rich, ,− Si-rich, ,, Fe-rich, ,, and biological. , Figure shows representative single-particle EDX spectra and corresponding SEM images for each of these most abundant particle types. Based on spreading upon impaction, projected area diameters (d pa ) in the images of Figure are larger than aerodynamic diameters. , …”

Section: Resultsmentioning

confidence: 99%

Atmospheric Aerosol Sulfur Distribution and Speciation in Mexico City: Sulfate, Organosulfates, and Isoprene-Derived Secondary Organic Aerosol from Low NO Pathways

Cooke,

Waters,

Asare

et al. 2024

ACS EST Air

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Poor air quality is a persistent challenge in Mexico City, and addressing this issue requires an understanding of the chemical composition of PM2.5 (particulate matter less than 2.5 μm in diameter). Sulfate and secondary organic aerosol (SOA) are two of the largest contributors to PM2.5 in Mexico City, but uncertainties exist regarding their sources, distribution across individual particles, and ability to form organosulfates. Herein, we show using electron dispersive x-ray spectroscopy that only 41 ± 1% and 25 ± 1% of particles (aerodynamic diameter, 0.32–0.56 μm) by number at two sites in Mexico City, respectively, contain sulfur. Vibrational spectroscopy (Optical-Photothermal Infrared + Raman Microspectroscopy) shows that these sulfur-containing particles consist of inorganic sulfate (SO4 2–) and organosulfates (ROSO3 –). In addition, we unexpectedly measured abundant isoprene-derived SOA from low nitric oxide reaction pathways, specifically organosulfates (methyltetrol sulfates = avg. 50 ng/m3, max. 150 ng/m3) and polyols (methyltetrols = avg. 70 ng/m3, max. 190 ng/m3) using liquid chromatography with high-resolution mass spectrometry. Differences in SO2 and NO x concentrations between sites likely contribute to these spatial differences in sulfate, organosulfate, and SOA formation. These findings improve understanding of sulfur distribution and sources of SOA in Mexico City, which can inform efforts to improve air quality.

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“…The traditional electron microscope analysis needs a manual operation, which can only analyze about 1000 particles per hour, and the analysis efficiency is low; The computer-controlled scanning electron microscope and energy spectrum system (CCSEM-EDX) can obtain energy spectrum and image information of thousands of particles per hour, significantly improving the efficiency of particle analysis. Currently, scholars have used CCSEM-EDX to study the change of the mass concentration of specific types of particulate matter with time in a small area, the spatial variability of the mass and composition of regional particulate matter, and the seasonal change of particulate matter [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Study on the Physical and Chemical Characteristics and Sources of Atmospheric Single Particles in Weifang During the 2022 Winter Olympic Games and the Winter Paralympic Games

Chang¹,

Gao²,

Li³

et al. 2023

Atlantis Highlights in Intelligent Systems

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In order to evaluate the effectiveness of air quality assurance measures during the 2022 Beijing Winter Olympic Games and the Winter Paralympic Games, samples of atmospheric particulates in Weifang City during the 2022 Winter Olympic Games and the Winter Paralympic Games were collected to analyze the level of air pollution during the Winter Olympic Games and the Winter Paralympic Games. The computer-controlled scanning electron microscopy and energy spectrum system (CCSEM-EDX) was used to analyze the morphology characteristics of particulates, the type and quantity proportion of particulates, and the quantity-particle size distribution of particulates. The results show that the air quality during the 2022 Winter Olympic Games and the Winter Paralympic Games is better than that in the same historical period of 2020 and 2021, the control measures are effective.

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Characterization of PM2.5 Carbonaceous Particles with a High-Efficiency SEM: A Case Study at a Suburban Area of Xi’an

Cited by 5 publications

References 30 publications

Characterization from Diesel and Renewable Fuel Engine Exhaust: Particulate Size/Mass Distributions and Optical Properties

Characterization from Diesel and Renewable Fuel Engine Exhaust: Particulate Size/Mass Distributions and Optical Properties

Atmospheric Aerosol Sulfur Distribution and Speciation in Mexico City: Sulfate, Organosulfates, and Isoprene-Derived Secondary Organic Aerosol from Low NO Pathways

Study on the Physical and Chemical Characteristics and Sources of Atmospheric Single Particles in Weifang During the 2022 Winter Olympic Games and the Winter Paralympic Games

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