scholarly journals Identification of matter flows in marginal filters of rivers (based on the principles of thermodynamics)

2020 ◽  
Vol 163 ◽  
pp. 06008
Author(s):  
Aleksandr Khaustov ◽  
Margarita Redina ◽  
Inna Nemirovskaya
Keyword(s):  
Aromatic Hydrocarbons ◽  
Environmental Fate ◽  
Aquatic Systems ◽  
Marginal Filter ◽  
Suspended Material ◽  
Migration Activity ◽  
Energy Flows ◽  
Polycyclic Aromatic ◽  
Thermodynamic Processes

Material and energy flows in the marginal filters of rivers identified based on the analyses of the environmental fate of polycyclic aromatic hydrocarbons (PAH): Anthracene (An), Phenanthrene (Phen), Naphthalene (Naph), Pyrene (Py), Fluoranthene (Flu), Chrysene (Chr), Benzo[a]pyrene (BaP), Perylene (Pl). Experimental data on the components of the aquatic system of the marginal filter of the Northern Dvina River allow us to consider the processes of phase transitions of PAHs at geochemical barriers (GCB). Based on the principles of thermodynamics, a phenomenological model of migration and the formation of the most persistent PAH associations on the barriers is formed. The predominant possibility of PAH migration on suspended material, including biota, is shown. The probability of PAH accumulation between the most important components of aquatic systems was assessed according to the conditions of their migration activity in various zones of the marginal filter. Active and passive PAHs were determined in terms of their migration and accumulation in the components of aquatic systems. The role of PAHs as a reliable indicator of thermodynamic processes, including the development of technogenesis, is estimated.

scholarly journals Specificity of accumulation of hydrocarbons in various components of geosystems

2020 ◽  
Vol 169 ◽  
pp. 01013
Author(s):  
Aleksandr Khaustov ◽  
Margarita Redina
Keyword(s):  
Mass Transfer ◽  
Aromatic Hydrocarbons ◽  
Thermodynamic Characteristics ◽  
Point Of View ◽  
Living Matter ◽  
Energy Flows ◽  
Other Substances ◽  
Polycyclic Aromatic ◽  
Marker Compounds

The results of the analysis of thermodynamic characteristics of the processes of hydrocarbon amassment in the components of geochemical systems are presented (waters, soils, plants and other substances forming ecosystem). The need to use an ideology and apparatus for calculating thermodynamics is due to the complexity and diversity of mass transfer in interacting media. The material and energy flows of marker compounds, polycyclic aromatic hydrocarbons (PAHs), are analyzed: Naphthalene (Naph), Acenaphthene (Ace), Fluorene (Flourene), Phenanthrene (Phen), Anthracene (An), Fluoranthene (Flu), Pyrene (Py), benzo[a]anthracene (BaA), Chrysene (Chr), Benzo[b]fluoranthene (BbFlu), Benzo[k]fluoranthene (BkFlu), Benzo[a]pyrene (BaP), Benzo[ghi]perylene (Bghi), Dibenzo[a, h]anthracene (DbA), Indeno[1, 2-cd]pyrene (Ip). Estimates are obtained of the intensity of PAH concentration processes in geochemical systems in different states from the point of view of stability, from clearly unstable to metastable. The role of living matter in the formation of stability of geochemical systems is revealed.

Role of alterations in ca2+‐associated signaling pathways in the immunotoxicity of polycyclic aromatic hydrocarbons

1995 ◽  
Vol 45 (2) ◽  
pp. 101-126 ◽  
Author(s):  
Donna R. Davila ◽  
DeAnn P. Davis ◽  
Kerry Campbell ◽  
John C. Cambier ◽  
Letitia A. Zigmond ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Signaling Pathways ◽  
Aromatic Hydrocarbons ◽  
Polycyclic Aromatic

9,10-Dinaphthylphenanthrene: Synthese, Rotationsisomerie und Photocyclisierung zu polycyclischen aromatischen Kohlenwasserstoffen9,10-Dinaphthylphenanthrenes: Synthesis, Rotational Isomers and Photocyclization to Polycyclic Aromatic Hydrocarbons

1992 ◽  
Vol 47 (12) ◽  
pp. 1764-1774 ◽  
Author(s):  
Karl-Dietrich Gundermann ◽  
Elke Romahn ◽  
Maximilian Zander
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Energy Transfer ◽  
Nmr Spectroscopy ◽  
Aromatic Hydrocarbons ◽  
Trans Isomers ◽  
Preparative Scale ◽  
Rotational Isomers ◽  
Polycyclic Aromatic

9,10-Di(1-naphthyl)phenanthrene (5 a) and 9,10-di(2-naphthyl)phenanthrene (5 b) have been synthesized. It is shown that 5 a and 5b both form two stable rotational (cis/trans) isomers with the naphthalene molecular planes perpendicular to the phenanthrene plane. In the case of 5 a the mixture of the two isomers has been separated in a preparative scale and each isomer characterized by e. g., NMR spectroscopy. Photocyclization of 5a leads to benzo[e]phenanthro[1,2,3,4-ghi]perylene (9) while 5 b yields phenanthro[9,10-i]pentahelicene (14); both hydrocarbons have not been previously described in the literature. The observed selectivities of photocyclization are explained on the basis of the structures and stabilities of the initially formed photoproducts (dihydro structures 15 and 14 a). The role of intramolecular non-radiative singlet-singlet energy transfer (naphthalene → phenanthrene) as competing with photocyclization is discussed in detail.

The Role of Iron Oxide on the Photodegradation of Polycyclic Aromatic Hydrocarbons: Characterization and Toxicity

2018 ◽  
Vol 40 (2) ◽  
pp. 524-534 ◽  
Author(s):  
Montse Marquès ◽  
Daniel Cervelló ◽  
Montse Mari ◽  
Jordi Sierra ◽  
Marta Schuhmacher ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Iron Oxide ◽  
Aromatic Hydrocarbons ◽  
Polycyclic Aromatic
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