scholarly journals Long-Term Effects of a Standardized Complex Mixture of Urban Dust Particulate on the Metabolic Activation of Carcinogenic Polycyclic Aromatic Hydrocarbons in Human Cells in Culture

2005 ◽  
Vol 88 (2) ◽  
pp. 358-366 ◽  
Author(s):  
Tamara Musafia-Jeknic ◽  
Brinda Mahadevan ◽  
Clifford Pereira ◽  
William M. Baird
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Complex Mixture ◽  
Metabolic Activation ◽  
Human Cells ◽  
Urban Dust ◽  
Long Term Effects ◽  
Polycyclic Aromatic ◽  
Dust Particulate

scholarly journals The Role of Methyl Groups in the Early Stage of Thermal Polymerization of Polycyclic Aromatic Hydrocarbons Revealed by Molecular Imaging

2020 ◽  
Author(s):  
Pengcheng Chen ◽  
Shadi Fatayer ◽  
Bruno Schuler ◽  
Jordan N. Metz ◽  
Leo Gross ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Early Stage ◽  
Complex Mixture ◽  
Thermal Polymerization ◽  
Industrial Applications ◽  
Thermal Reactions ◽  
Force Microscopy ◽  
Wide Range ◽  
Polycyclic Aromatic

The initial thermal reactions of aromatic hydrocarbons are relevant to many industrial applications. However, tracking the growing number of heavy polycyclic aromatic hydrocarbon (PAH) products is extremely challenging because many reactions are unfolding in parallel from a mixture of molecules. Herein, we studied the reactions of 2,7-dimethylpyrene (DMPY) to decipher the roles of methyl substituents during mild thermal treatment. We found that the presence of methyl substituents is key for reducing the thermal severity required to initiate chemical reactions in natural molecular mixtures. A complex mixture of thermal products including monomers, dimers, and trimers were characterized by NMR, mass spectrometry and non-contact atomic force microscopy (nc-AFM). A wide range of structural transformations including methyl transfer and polymerization reactions were identified. A detailed mechanistic understanding was obtained on the roles of H radicals during the polymerization of polycyclic aromatic hydrocarbons.

scholarly journals The Most Important Methods for Depollution of Hydrocarbons Polluted Soils

1970 ◽  
Vol 66 (1) ◽  
Author(s):  
Laura DOBOS ◽  
Carmen PUIA
Keyword(s):  
Molecular Weight ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Heterocyclic Compounds ◽  
Chemical Structure ◽  
Complex Mixture ◽  
Naphthenic Acids ◽  
International Agency ◽  
Polluted Soils ◽  
Polycyclic Aromatic

Crude oil is a highly complex mixture of hydrocarbons amounting to hundreds of individual compounds with different chemical structure and molecular weight plus a series of lower molecular weight compounds other than hydrocarbons (phenols, thiols, naphthenic acids, heterocyclic compounds with N (pyridines, pyrrole, indole, s.o.) compounds S (alkyl thiols, thiophene, etc.) (Zarnea, 1994). Mineral oil and polycyclic aromatic hydrocarbons (PAHs) creates larger environmental problems. They are considered particularly dangerous. In this regard, EPA Agency from U.S.A. includes a number of polycyclic aromatic hydrocarbons under 16 priority pollutants, which require special attention. IARC (International Agency for Research on Cancer) has identified 15 types of polycyclic aromatic hydrocarbons including six of the 16 types of PAHs, identifiable by the USEPA as having carcinogenic properties (Chauhan Archana et al., 2008).

scholarly journals Polycyclic aromatic hydrocarbons in biochar amended soils: Long-term experiments in Brazilian tropical areas

Chemosphere ◽  
2018 ◽  
Vol 200 ◽  
pp. 641-648 ◽  
Author(s):  
Michele Fabri de Resende ◽  
Taila Figueredo Brasil ◽  
Beata Emoke Madari ◽  
Annibal Duarte Pereira Netto ◽  
Etelvino Henrique Novotny
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Amended Soils ◽  
Long Term Experiments ◽  
Polycyclic Aromatic ◽  
Tropical Areas
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