Dependence of the standard thermodynamic properties of isomer groups of benzenoid polycyclic aromatic hydrocarbons on carbon number

1990 ◽  
Vol 94 (22) ◽  
pp. 8477-8482 ◽  
Author(s):  
Robert A. Alberty ◽  
Kuo Chih. Chou
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Thermodynamic Properties ◽  
Aromatic Hydrocarbons ◽  
Carbon Number ◽  
Polycyclic Aromatic ◽  
Standard Thermodynamic Properties

Phase changes of the water hexamer and octamer in the gas phase and adsorbed on polycyclic aromatic hydrocarbons

2015 ◽  
Vol 17 (26) ◽  
pp. 17079-17089 ◽  
Author(s):  
Luiz Fernando L. Oliveira ◽  
Jérôme Cuny ◽  
Maxime Morinière ◽  
Léo Dontot ◽  
Aude Simon ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Thermodynamic Properties ◽  
Gas Phase ◽  
Aromatic Hydrocarbons ◽  
Atmospheric Chemistry ◽  
Water Clusters ◽  
Phase Changes ◽  
Small Water ◽  
Polycyclic Aromatic

We investigate thermodynamic properties of small water clusters adsorbed on polycyclic aromatic hydrocarbons, which are relevant systems in the context of astrophysical and atmospheric chemistry.

Problems in the identification of anthropogenic hydrocarbons against natural background levels in the Antarctic

1989 ◽  
Vol 1 (4) ◽  
pp. 307-312 ◽  
Author(s):  
G.C. Cripps
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Carbon Number ◽  
Complex Mixtures ◽  
Natural Background ◽  
Anthropogenic Contamination ◽  
Anthropogenic Input ◽  
A Value ◽  
Polycyclic Aromatic ◽  
The Antarctic

Hydrocarbons in the environment occur as complex mixtures. The detection of low-level anthropogenic contamination can be difficult as many of the compounds can also be found in biogenic materials. Results obtained in the Antarctic show that accepted methods of distinguishing biogenic from contaminating hydrocarbons are inconsistent. The samples taken from South Georgia in the vicinity of derelict whaling stations had odd-to-even carbon number ratios in the range 0.8–1.0. An offshore site had the highest levels for phytane and the lowest for pristane. The pristane-to-phytane ratio varied between 0.4 and 1.4 and contradicted the interpretation of the odd-to-even ratio at several sites. A value of less than 1.0 for these ratios has been taken to indicate anthropogenic origin. A number of polycyclic aromatic hydrocarbons were detected at all the sites, but the concentration gradient did not correspond with that of the n-alkanes. It is therefore recommended that recognition of anthropogenic input is based on quantification of all compounds against a well-defined baseline. The source of the pollution can then be estimated from the distribution patters of the hydrocarbons.

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