scholarly journals Occurrence of Penta-Aromatic Hydrocarbons in Jaintia and Barail Group Mudstones, Northeastern Bengal Basin, Bangladesh

2014 ◽  
Vol 8 ◽  
pp. 105-112
Author(s):  
HM Zakir Hossain ◽  
Md Sultan-Ul-Islam ◽  
Quazi Hasna Hossain
Keyword(s):  
Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbons ◽  
Concentration Distribution ◽  
Gas Chromatography Mass Spectrometry ◽  
Bengal Basin ◽  
Drill Core ◽  
Environmental Condition ◽  
High Concentration ◽  
Biogenic Origin

In the present experiment, concentration, distribution and sources of penta-aromatic hydrocarbons in seven drill core and outcrop samples from Jaintia and Barail Group mudstones, northeastern Bengal Basin, Bangladesh have been studied. Gas chromatography-mass spectrometry (GC-MS) was used to obtain composition details about the sedimentary organic matter (OM). Mudstone samples were found to contain relatively high penta-aromatic hydrocarbon abundances in the lower Jaintia Group than in the overlying Barail Group. High concentration of perylene suggests terrigenous sources and significantly higher content of total organic carbon in the samples. A biogenic origin of perylene therefore indicates oxygen deficient environmental condition for deposition of OM. Perylene over pentacyclic aromatic hydrocarbon isomers regulating in-situ diagenetic origin. DOI: http://dx.doi.org/10.3329/jles.v8i0.20154 J. Life Earth Sci., Vol. 8: 105-112, 2013

Cyclic Alkyne Approach to Heteroatom-Containing Polycyclic Aromatic Hydrocarbon Scaffolds

2019 ◽  
Author(s):  
Evan Darzi ◽  
Joyann Barber ◽  
Neil Garg
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbons ◽  
Diels Alder ◽  
Pericyclic Reactions ◽  
One Pot ◽  
Synthetic Strategy ◽  
Polycyclic Aromatic

We report a modular synthetic strategy for accessing heteroatom-containing polycyclic aromatic hydrocarbons (PAHs) that relies on the controlled generation of transient heterocyclic alkynes and arynes. The strained intermediates undergo in situ trapping with readily accessible oxadiazinones. Four sequential pericyclic reactions occur, namely two Diels–Alder / retro-Diels–Alder sequences, which can be performed in a stepwise or one-pot fashion to assemble four new carbon–carbon (C–C) bonds.

Cyclic Alkyne Approach to Heteroatom-Containing Polycyclic Aromatic Hydrocarbon Scaffolds

2019 ◽  
Author(s):  
Evan Darzi ◽  
Joyann Barber ◽  
Neil Garg
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbons ◽  
Diels Alder ◽  
Pericyclic Reactions ◽  
One Pot ◽  
Synthetic Strategy ◽  
Polycyclic Aromatic

We report a modular synthetic strategy for accessing heteroatom-containing polycyclic aromatic hydrocarbons (PAHs) that relies on the controlled generation of transient heterocyclic alkynes and arynes. The strained intermediates undergo in situ trapping with readily accessible oxadiazinones. Four sequential pericyclic reactions occur, namely two Diels–Alder / retro-Diels–Alder sequences, which can be performed in a stepwise or one-pot fashion to assemble four new carbon–carbon (C–C) bonds.

scholarly journals Seasonal Variation of Volatile Poly Aromatic Hydrocarbons (PAHs) Released from Different Sources in South Cairo

2020 ◽  
Vol 9 (2) ◽  
pp. 92
Author(s):  
Ashraf A. Zahran ◽  
Mahmoud A. Howaihe ◽  
Mostafa H. Ragab ◽  
Mahmoud M. Nour Eldeen
Keyword(s):  
Aromatic Hydrocarbons ◽  
Environmental Protection Agency ◽  
Heavy Traffic ◽  
The United States ◽  
Average Concentration ◽  
Gas Chromatography Mass Spectrometry ◽  
High Concentration ◽  
Data Set ◽  
Total Concentrations ◽  
Poly Aromatic Hydrocarbons

Based on a year-round data-set (from January to November 2014), an intensive air sampling program was conducted during 2014 in four different function sites in South El-Tabbin city to study the temporally and spatially characteristics of Poly Aromatic Hydrocarbons (PAHs) in the gaseous and particulate phases. This area is considered as one of the most polluted areas in Egypt as it includes heavy industrial plants, as well as it is bounded by heavy traffic. A total of 48 atmospheric samples were collected by a high-volume active air sampler. The gaseous and particulate phases of PAHs were extracted and analyzed using Gas chromatography/mass spectrometry together. The total concentrations of the sixteen PAHs (which tagged the United States Environmental Protection Agency priority) in the air of the study area ranged from 76.48 ± 19.44 µg/m3 to 26995.86 ± 2835.91 µg/m3. The average PAHs concentration in the coke production site was ~ 355 times of that in the residential area site. For the whole study area; 4, 5, and 6 rings PAHs were dominant and accounting for ~66% – ~84%. The total concentrations of combustion derived PAHs were ranged from 63.24 ± 17.35 µg/m3 to 17546.97 ± 1848.55 µg/m3 covering 65% − 83% of total PAHs which indicating large amounts of combustion sources existed from them in South El-Tabbin city. Seasonal trends of PAHs concentrations were observed with a high concentration in winter and low in summer where the average concentration of PAHs in winter was ~1.6 times higher than that in summer.

scholarly journals Vertical distribution and sources of perylene in miocene mudstones from the northeastern Bengal Basin of Bangladesh

2014 ◽  
Vol 48 (4) ◽  
pp. 257-264
Author(s):  
HMZ Hossain
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Organic Matter ◽  
Vertical Distribution ◽  
Aromatic Hydrocarbons ◽  
Environmental Conditions ◽  
Climatic Conditions ◽  
Gas Chromatography Mass Spectrometry ◽  
Bengal Basin ◽  
Surma Group

The distributions and sources of perylene (Pery) and penta-aromatic hydrocarbons were investigated in 10 Miocene mudstones from the NE Bengal Basin, Bangladesh using gas chromatography-mass spectrometry (GC-MS). Pery concentrations were high in most of the samples, and highest levels were found in samples of strong terrigenous influence of organic matter deposited under reducing environmental conditions. Mudstones in the Bokabil Formation (upper Surma Group) contain relatively high abundances of benzofluoranthenes (Bflas), benzo[e]pyrene (BePy) and benzo[a]pyrene (BaPy) attributed to their combustion origin. Pery to pentacyclic aromatic isomers (PAIs) ratios implies an influence of diagenetic sources, whereas low BaPy/BePy ratios indicate that these compounds were originated from combustion sources. Wood degrading fungi in arid to humid and seasonal climatic conditions was also the possible source of Pery in the studied succession. DOI: http://dx.doi.org/10.3329/bjsir.v48i4.18275 Bangladesh J. Sci. Ind. Res. 48(4), 257-264, 2013

scholarly journals Catalytic Co-Pyrolysis of Kraft Lignin with Refuse-Derived Fuels Using Ni-Loaded ZSM-5 Type Catalysts

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 506 ◽  
Author(s):  
Hyung Lee ◽  
Jin Cha ◽  
Young-Kwon Park
Keyword(s):  
Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbons ◽  
Kraft Lignin ◽  
Gas Chromatography Mass Spectrometry ◽  
X Ray Diffraction ◽  
Hydrocarbon Production ◽  
Catalytic Upgrading ◽  
Hydrocarbon Formation ◽  
Refuse Derived Fuels ◽  
Area X

The catalytic co-pyrolysis (CCP) of Kraft lignin (KL) with refuse-derived fuels (RDF) over HZSM-5, Ni/HZSM-5, and NiDHZSM-5 (Ni/desilicated HZSM-5) was carried out using pyrolyzer-gas chromatography/mass spectrometry (Py-GC/MS) to determine the effects of the nickel loading, desilication of HZSM-5, and co-pyrolysis of KL with RDF. The catalysts were characterized by Brunauer–Emmett–Teller surface area, X-ray diffraction, and NH3-temperature programed desorption. The nickel-impregnated catalyst improved the catalytic upgrading efficiency and increased the aromatic hydrocarbon production. Compared to KL, the catalytic pyrolysis of RDF produced larger amounts of aromatic hydrocarbons due to the higher H/Ceff ratio. The CCP of KL with RDF enhanced the production of aromatic hydrocarbons by the synergistic effect of hydrogen rich feedstock co-feeding. In particular, Ni/DHZSM-5 showed higher aromatic hydrocarbon formation owing to its higher acidity and mesoporosity.

PETROLEUM SULFUR-CONTAINING COMPOUNDS AND AROMATIC HYDROCARBONS IN THE MARINE MOLLUSKS MODIOLUS DEMISSUS AND CRASSOTREA VIRGINICA1

1977 ◽  
Vol 1977 (1) ◽  
pp. 627-632 ◽  
Author(s):  
James L. Lake ◽  
Carl Hershner
Keyword(s):  
Gas Chromatography ◽  
Aromatic Hydrocarbons ◽  
Recovery Period ◽  
Sulfur Compounds ◽  
Fuel Oil ◽  
Gas Chromatography Mass Spectrometry ◽  
Photometric Detection ◽  
Marine Mollusks ◽  
Flame Ionization

ABSTRACT The in situ recovery of the mussel Modiolus demissus and the oyster Crassostrea virginica from successive small experimental dosings of No. 2 fuel oil was examined to determine the retention and release of petroleum hydrocarbons and petro-sulfur compounds from these marine mollusks. Extracts were obtained from the organisms over a four-month recovery period, and were analyzed by flame ionization detection (FID) and flame photometric detection (FPD) gas chromatography, and gas chromatography-mass spectrometry (GCMS). Results showed a large majority of the petroleum compounds that were present in these organisms’ after two weeks of recovery were lost by the 15th week. Both mollusks showed an enrichment of aromatic (releative to saturated) hydrocarbons during the first portion of recovery. As the recovery time lengthened, the aromatics were lost more rapidly than the saturates. Mussels showed relative increases in some individual aromatic hydrocarbons during the recovery period. The oysters, however, appeared to non-selectively depurate the aromatic hydrocarbons. The higher molecular weight petro-sulfur compounds were retained for the longest time periods. During the study period these compounds appeared to be lost from the mollusks at rates similar to those observed for the aromatic hydrocarbons.

scholarly journals Subsurface Cycling of Nitrogen and Anaerobic Aromatic Hydrocarbon Biodegradation Revealed by Nucleic Acid and Metabolic Biomarkers

2010 ◽  
Vol 76 (10) ◽  
pp. 3124-3134 ◽  
Author(s):  
Jane M. Yagi ◽  
Joseph M. Suflita ◽  
Lisa M. Gieg ◽  
Christopher M. DeRito ◽  
Che-Ok Jeon ◽  
...  
Keyword(s):  
Aromatic Hydrocarbon ◽  
Gas Chromatography Mass Spectrometry ◽  
Hydrocarbon Biodegradation ◽  
Mass Spectrometry Detection ◽  
Data Link ◽  
Benzylsuccinate Synthase ◽  
Metabolic Biomarkers ◽  
Link Formation ◽  
Aerobic And Anaerobic

ABSTRACT Microbial processes are crucial for ecosystem maintenance, yet documentation of these processes in complex open field sites is challenging. Here we used a multidisciplinary strategy (site geochemistry, laboratory biodegradation assays, and field extraction of molecular biomarkers) to deduce an ongoing linkage between aromatic hydrocarbon biodegradation and nitrogen cycling in a contaminated subsurface site. Three site wells were monitored over a 10-month period, which revealed fluctuating concentrations of nitrate, ammonia, sulfate, sulfide, methane, and other constituents. Biodegradation assays performed under multiple redox conditions indicated that naphthalene metabolism was favored under aerobic conditions. To explore in situ field processes, we measured metabolites of anaerobic naphthalene metabolism and expressed mRNA transcripts selected to document aerobic and anaerobic microbial transformations of ammonia, nitrate, and methylated aromatic contaminants. Gas chromatography-mass spectrometry detection of two carboxylated naphthalene metabolites and transcribed benzylsuccinate synthase, cytochrome c nitrite reductase, and ammonia monooxygenase genes indicated that anaerobic metabolism of aromatic compounds and both dissimilatory nitrate reduction to ammonia (DNRA) and nitrification occurred in situ. These data link formation (via DNRA) and destruction (via nitrification) of ammonia to in situ cycling of nitrogen in this subsurface habitat, where metabolism of aromatic pollutants has led to accumulation of reduced metabolic end products (e.g., ammonia and methane).

1,1’-Biaceanthrylene and 2,2'-Biaceanthrylene: Models for Linking Larger Polycyclic Aromatic Hydrocarbons via Five-Membered Rings

2019 ◽  
Author(s):  
Yachu Du ◽  
Kyle Plunkett
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Electronic Properties ◽  
Aromatic Hydrocarbons ◽  
Model Systems ◽  
Redox Potentials ◽  
Dimer Model ◽  
Optical And Electronic Properties ◽  
Polycyclic Aromatic

We show that polycyclic aromatic hydrocarbon (PAH) chromophores that are linked between two five-membered rings can access planarized structures with reduced optical gaps and redox potentials. Two aceanthrylene chromophores were connected into dimer model systems with the chromophores either projected outward (2,2’-biaceanthrylene) or inward (1,1’-biaceanthrylene) and the optical and electronic properties were compared. Only the planar 2,2’-biaceanthrylene system showed significant reductions of the optical gaps (1 eV) and redox potentials in relation to the aceanthrylene monomer.<br>

1,1’-Biaceanthrylene and 2,2'-Biaceanthrylene: Models for Linking Larger Polycyclic Aromatic Hydrocarbons via Five-Membered Rings

2019 ◽  
Author(s):  
Yachu Du ◽  
Kyle Plunkett
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Electronic Properties ◽  
Aromatic Hydrocarbons ◽  
Model Systems ◽  
Redox Potentials ◽  
Dimer Model ◽  
Optical And Electronic Properties ◽  
Polycyclic Aromatic

We show that polycyclic aromatic hydrocarbon (PAH) chromophores that are linked between two five-membered rings can access planarized structures with reduced optical gaps and redox potentials. Two aceanthrylene chromophores were connected into dimer model systems with the chromophores either projected outward (2,2’-biaceanthrylene) or inward (1,1’-biaceanthrylene) and the optical and electronic properties were compared. Only the planar 2,2’-biaceanthrylene system showed significant reductions of the optical gaps (1 eV) and redox potentials in relation to the aceanthrylene monomer.<br>

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