scholarly journals Investigating repetitive reaction pathways for the formation of polycyclic aromatic hydrocarbons in combustion processes

2017 ◽  
Vol 180 ◽  
pp. 250-261 ◽  
Author(s):  
Nils Hansen ◽  
Marina Schenk ◽  
Kai Moshammer ◽  
Katharina Kohse-Höinghaus
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Reaction Pathways ◽  
Polycyclic Aromatic ◽  
Combustion Processes

scholarly journals Prediction of gas-particle partitioning of PAHs based on M5’ model trees

2011 ◽  
Vol 15 (1) ◽  
pp. 105-114 ◽  
Author(s):  
Jelena Radonic ◽  
Dubravko Culibrk ◽  
Mirjana Vojinovic-Miloradov ◽  
Branislav Kukic ◽  
Maja Turk-Sekulic
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Ambient Air ◽  
Adsorption Model ◽  
M5 Model Tree ◽  
Polycyclic Aromatic ◽  
Tree Models ◽  
Experimental Values ◽  
Combustion Processes ◽  
M5 Model

During the thermal combustion processes of carbon-enriched organic compounds, emission of polycyclic aromatic hydrocarbons into ambient air occurs. Previous studies of atmospheric distribution of polycyclic aromatic hydrocarbons showed low correlation between the experimental values and Junge-Pankow theoretical adsorption model, suggesting that other approaches should be used to describe the partitioning phenomena. The paper evaluates the applicability of multivariate piece-wise-linear M5? model-tree models to the problem of gas-particle partitioning. Experimental values of particle-associated fraction, obtained for 129 ambient air samples collected at 24 background, urban and industrial sites, were compared to the prediction results obtained using M5? and the Junge-Pankow model. The M5? approach proposed and models learned are able to achieve good correlation (correlation coefficient >0.9) for some low-molecular-weight compounds, when the target is to predict the concentration of gas phase based on the particle-associated phase. When converted to particle-bound fraction values, the results, for selected compounds, are superior to those obtained by Junge-Pankow model by several orders of magnitude, in terms of the prediction error.

scholarly journals Prediction of gas-particle partitioning of polycyclic aromatic hydrocarbons based on M5' model trees

2012 ◽  
Vol 16 (2) ◽  
pp. 551-560 ◽  
Author(s):  
Jelena Radonic ◽  
Dubravko Culibrk ◽  
Mirjana Vojinovic-Miloradov ◽  
Branislav Kukic ◽  
Maja Turk-Sekulic
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Ambient Air ◽  
Adsorption Model ◽  
M5 Model Tree ◽  
Polycyclic Aromatic ◽  
Tree Models ◽  
Experimental Values ◽  
Combustion Processes ◽  
M5 Model

During the thermal combustion processes of carbon-enriched organic compounds, emission of polycyclic aromatic hydrocarbons into ambient air occurs. Previous studies of atmospheric distribution of polycyclic aromatic hydrocarbons showed low correlation between the experimental values and Junge-Pankow theoretical adsorption model, suggesting that other approaches should be used to describe the partitioning phenomena. The paper evaluates the applicability of multivariate piece-wise-linear M5' model-tree models to the problem of gas-particle partitioning. Experimental values of particle-associated fraction, obtained for 129 ambient air samples collected at 24 background, urban, and industrial sites, were compared to the prediction results obtained using M5' and the Junge-Pankow model. The M5' approach proposed and models learned are able to achieve good correlation (correlation coefficient >0.9) for some low-molecular-weight compounds, when the target is to predict the concentration of gas phase based on the particle-associated phase. When converted to particle-bound fraction values, the results, for selected compounds, are superior to those obtained by Junge-Pankow model by several orders of magnitude, in terms of the prediction error. <br><br><font color="red"><b> This article has been retracted. Link to the retraction <u><a href="http://dx.doi.org/10.2298/TSCI121205224E">10.2298/TSCI121205224E</a><u></b></font>

scholarly journals A Molecular Beams and Computational Study on the Barrierless Gas Phase Formation of (Iso)Quinoline in Low Temperature Extraterrestrial Environments

2021 ◽  
Author(s):  
Long Zhao ◽  
Matthew Prendergast ◽  
Ralf I. Kaiser ◽  
Bo Xu ◽  
Wenchao Lu ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Low Temperature ◽  
Gas Phase ◽  
Aromatic Hydrocarbons ◽  
Computational Study ◽  
Molecular Beams ◽  
Reaction Pathways ◽  
Complex Reaction ◽  
Polycyclic Aromatic ◽  
Remarkable Progress

Despite remarkable progress toward the understanding of the formation pathways leading to polycyclic aromatic hydrocarbons (PAHs) in combustion systems and in deep space, the complex reaction pathways leading to nitrogen-substituted...

scholarly journals The use of polycyclic aromatic hydrocarbons molecular diagnostic ratios as a source identification tool - case study

2018 ◽  
Vol 247 ◽  
pp. 00062
Author(s):  
Katarzyna Janoszka ◽  
Justyna Klyta ◽  
Łukasz Laks ◽  
Krzysztof Słaby
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Source Identification ◽  
Anthropogenic Sources ◽  
Rural Site ◽  
Molecular Diagnostic ◽  
Diagnostic Ratios ◽  
Polycyclic Aromatic ◽  
Combustion Processes

Levoglucosan (LG) and Polycyclic Aromatic Hydrocarbons (PAHs) are organic substances emitted from variety of anthropogenic sources, mainly as a result of incomplete combustion or pyrolysis of organic material. The seasonality of PAHs emissions is a well demonstrated fact, observed in most monitoring studies, where PAHs air concentrations in winter are much higher than their respective in the summer, due to seasonally variable emission sources. Various techniques have been proposed as ideal source identification (or apportionment) tools, and much debate exists in scientific literature about the effectiveness of the proposed methodologies. The most common methodology is the use of molecular diagnostic ratios (MDRs). Based on the annual measurement campaign in rural site located on South Poland, were levoglucose and PAHs were analyzed, the MDRs were determined. The results showed that the combustion processes of solid fuels, including biomass, are mainly responsible for air quality.

scholarly journals A Mini-Review for an Adsorption of Polycyclic Aromatic Hydrocarbons (PAHs) by Physical Gel

2021 ◽  
Vol 12 (6) ◽  
pp. 8195-8204
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Human Exposure ◽  
Review Article ◽  
Functional Material ◽  
Preparation Methods ◽  
Household Wastewater ◽  
Polycyclic Aromatic ◽  
Physical Gel ◽  
Combustion Processes

On 4 December in 2002, the mainstream source of exposure to Polycyclic Aromatic Hydrocarbons (PAHs) was defined by the Scientific Committee as food and inhaled air. Several Polycyclic Aromatic Hydrocarbons (PAHs) such as benzo[a]pyrene, chrysene, and dibenzo(a,h)anthracene in food caused the risk of human health. These are produced by the cooking processes, including combustion processes and pyrolysis sources. Certain food preparation methods like grilling, roasting, and smoking are accumulated PAHs in the sink pipes. As PAHs are toxic and carcinogenic, it raises health and environmental problems. What is the method for preventing PAHs exist in wastewater? This review article introduces a functional material, gelatin physical gels, to trap and remove the PAHs. The physical gel changes from colorless to pale yellow during the adsorption of PAHs in household wastewater. The concentration of PAHs is determined by GC-MS analysis, which decreases the potential risk of human exposure in an environment with PAHs.

scholarly journals Toxicities of Polycyclic Aromatic Hydrocarbons for Aquatic Animals

2020 ◽  
Vol 17 (4) ◽  
pp. 1363 ◽  
Author(s):  
Masato Honda ◽  
Nobuo Suzuki
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Environmental Problem ◽  
Oil Spills ◽  
Environmental Issue ◽  
Aquatic Animals ◽  
Lipophilic Compounds ◽  
Polycyclic Aromatic ◽  
Combustion Processes ◽  
Pah Toxicity

Polycyclic aromatic hydrocarbons (PAHs) are organic compounds that are widely distributed in the air, water, and soil. Recently, the amount of PAHs derived from fuels and from incomplete combustion processes is increasing. In the aquatic environment, oil spills directly cause PAH pollution and affect marine organisms. Oil spills correlate very well with the major shipping routes. Furthermore, accidental oil spills can seriously impact the marine environment toxicologically. Here, we describe PAH toxicities and related bioaccumulation properties in aquatic animals, including invertebrates. Recent studies have revealed the toxicity of PAHs, including endocrine disruption and tissue-specific toxicity, although researchers have mainly focused on the carcinogenic toxicity of PAHs. We summarize the toxicity of PAHs regarding these aspects. Additionally, the bioaccumulation properties of PAHs for organisms, including invertebrates, are important factors when considering PAH toxicity. In this review, we describe the bioaccumulation properties of PAHs in aquatic animals. Recently, microplastics have been the most concerning environmental problem in the aquatic ecosystem, and the vector effect of microplastics for lipophilic compounds is an emerging environmental issue. Here, we describe the correlation between PAHs and microplastics. Thus, we concluded that PAHs have a toxicity for aquatic animals, indicating that we should emphasize the prevention of aquatic PAH pollution.

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