scholarly journals Uptake Coefficients of Some Volatile Organic Compounds by Soot and Their Application in Understanding Particulate Matter Evolution in Aircraft Engine Exhaust Plumes

2014 ◽  
Vol 136 (12) ◽  
Author(s):  
Zhenhong Yu ◽  
David S. Liscinsky ◽  
Bruce True ◽  
Jay Peck ◽  
Archer C. Jennings ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Field Measurements ◽  
Aircraft Engine ◽  
Engine Exhaust ◽  
Inverse Power Law ◽  
Volatile Organic ◽  
Polycyclic Aromatic ◽  
Uptake Coefficients

To assist microphysical modeling on particulate matter (PM) evolution emitted from aircraft engines, uptake coefficients of some volatile organic compounds on soot were experimentally determined in this study. The determined values vary from (1.0 ± 0.1) × 10−6 for water-miscible propylene glycol to (2.5 ± 0.1) × 10−5 for 2,6-dimethylnaphthalene, a polycyclic aromatic hydrocarbon. An inverse power-law correlation between uptake coefficient on soot and solubility in water was observed. Using the correlation, microphysical simulations were performed for the exhaust plume evolution from an idling aircraft, and we found that the model-predicted volatile PM composition on soot is comparable with those results from past field measurements.

Incense: Ritual, Health Effects and Prudence

2013 ◽  
Vol 23 (1) ◽  
pp. 5-9 ◽  
Author(s):  
URMILA NAIR
Keyword(s):  
Risk Factor ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Particulate Matter ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Aromatic Hydrocarbons ◽  
Allergic Reactions ◽  
Volatile Organic ◽  
Polycyclic Aromatic

AbstractThe burning of candles and incense is common in religious ceremonies worldwide. Analysis of incense smoke has shown the presence of particulate matter, volatile organic compounds, aldehydes and polycyclic aromatic hydrocarbons that are hazardous to health. Long-term exposure to smoke formed during combustion can cause airway dysfunction, allergic reactions and dermatological effects and is a risk factor implicated in the development of other serious diseases. In this paper the effect of these studies are reviewed and simple precautions suggested to avoid toxic effects of incense smoke.

scholarly journals Achieving a healthy indoor environment by using an emissions barrier for stopping spread of chemicals from building into the indoor air

2021 ◽  
Author(s):  
Johan Mattsson ◽  
Lennart Larsson
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Indoor Air ◽  
Aromatic Hydrocarbons ◽  
Indoor Environment ◽  
Concrete Slab ◽  
Treated Wood ◽  
Volatile Organic ◽  
Polycyclic Aromatic

An emissions barrier was used in premises with indoor air complaints due to emissions from the buildings in question. The emissions comprised chlorophenols/chloroanisoles and polycyclic aromatic hydrocarbons (PAH) from treated wood, and volatile organic compounds (VOC), mainly 2-ethylhexanol, from PVC flooring and the glue used to paste the flooring onto a concrete slab. Attaching the barrier at the surfaces from where the emissions were spread (floor, walls, ceiling) resulted in a fresh and odour-free indoor air. We conclude that using an emissions barrier in buildings made unhealthy by moisture is an efficient way of restoring a pleasant and healthy indoor air.

Use of External Radical Sources in Flash Vacuum Pyrolysis to Facilitate Cyclodehydrogenation Reactions in Polycyclic Aromatic Hydrocarbons

2014 ◽  
Vol 67 (9) ◽  
pp. 1338 ◽  
Author(s):  
Aaron W. Amick ◽  
Sara E. Martin
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Aromatic Hydrocarbons ◽  
Flash Vacuum Pyrolysis ◽  
Vacuum Pyrolysis ◽  
Ability To Act ◽  
New Process ◽  
Volatile Organic ◽  
Polycyclic Aromatic

A new process to facilitate the cyclodehydrogenation of polycyclic aromatic hydrocarbons (PAHs) in flash vacuum pyrolysis (FVP) using an external radical source is described. Using hexanes as an external radical source the conversion of various PAHs to their cyclodehydrogenated products is vastly increased. Various other volatile organic compounds were also examined to determine their ability to act as external radical sources in FVP.

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