Class separation of aromatic compounds in rock extracts and fossil fuels by liquid chromatography

Radke, M.; Willsch, H.; Welte, Dietrich H.

doi:10.1021/ac00277a061

Cited by 73 publications

(25 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Pulverized samples were exhaustively extracted by Soxhlet extraction using dichloromethane as solvent. All samples were prepared according to standard organic geochemical sample preparation techniques (Radke et al, 1980(Radke et al, , 1984. Aliquots of the extracts were separated into saturated and aromatic hydrocarbons and heterocyclic compounds by liquid chromatography using a dual column system and a back-flushing technique as a preparatory step for biomarker analysis.…”

Section: Methodsmentioning

confidence: 99%

Using aromatic biological markers as a tool for assessing thermal maturity of source rocks in the Campano-Maastrichtian Mamu Formation, southeastern Nigeria

Ogala¹,

Akaegbobi²

2014

Earth sci. res. j.

View full text Add to dashboard Cite

The concentration and distribution of aromatic biomarkers in coals and shales from five boreholes penetrating the Maastrichtian Mamu Formation of the Anambra Basin, southeastern Nigeria, were investigated by gas chromatography-mass spectrometry to assess the thermal maturity and organic matter input. The study focused on the variations of the relative abundances of naphthalenes, phenanthrenes, and monaromatic and triaromatic steroids identified on the mass fragmentograms. Trimethylnaphthalene (TMN) is the most abundant member of the naphthalene family while methylphenanthrene (MP) is the most abundant phenanthrene family member. The total of phenanthrenes and their isomers was greater than that of naphthalenes. The distribution of these aromatic hydrocarbons and their akyl derivatives was strongly controlled by a selective expulsion mechanism and thermal maturation of organic matter. The low dibenzothiophene/phenanthrene (DBT/PHEN) ratios (0.01-0.06), as well as the enhanced concentrations of 1,2,5-TMN relative to 1,2,7-TMN, indicates organic matter derived mainly from higher plants, and the extract ternary plot of C 27 , C 28 and C 29 monoaromatic steroids suggests a Type III and mixed Type II/III kerogen. The calculated mean vitrinite reflectance (%Rm), determined from the distributions of the isomers of methyldibenzothiophene ratio (MDR) in the rock extracts, ranged from 0.51 to 1.43. These maturity values indicate that the coal and shale extracts are marginally mature for hydrocarbon generation.La concentración y distribución de biomarcadores aromáticos en carbones y esquistos de cinco perforaciones en la formación Maastrichtian Mamu de la cuenca de Anambra, en el sureste de Nigeria, fueron analizados a través de un estudio de espectometría cromatográfico y de masa del gas para medir la madurez termal y la entrada de material orgánico. El estudio está enfocado en las variaciones de la abundancia relativa de naftalinas y fenantrenos, y en los esteroides monoaromáticos y triaromáticos identificados en los fragmentogramas de masas. La trimetinaftalina (TMN) es la más abundante de la familia de las naftalinas mientras el metilfenantreno (MP) es el más abundante de los fenantrenos. El tota de los fenantrenos y sus isómeros fue mayor que el de las naftalinas. La distribución de estos hidrocarbones aromáticos y sus alquilos derivados fue controlada ampliamente por un mecanismo de expulsión selectiva y de la maduración térmica de material orgánico. La baja proporción dibenziotofeno/fenantreno (DBT/ PHEN) (0.01-0.06), al igual que las concentraciones mejoradas de 1,2,5-TMN relativas de 1,2,7-TMN indican que la materia orgánica se deriva principalmente de plantas mayores, y del diagrama terniario de los esteroides monoaromáticos C 27 , C 28 y C 29 sugiere un tipo III mezclado con tipos II/III de querógenos. El valor calculado de la reflectancia de vitrinita (%Rm) determinado de la proporción de isómeros de metildibenziotofeno (MDR) en los extractos rocosos oscila de 0.51 a 1.43. Estos valores de madurez indican que lo...

show abstract

Section: Methodsmentioning

confidence: 99%

Using aromatic biological markers as a tool for assessing thermal maturity of source rocks in the Campano-Maastrichtian Mamu Formation, southeastern Nigeria

Ogala¹,

Akaegbobi²

2014

Earth sci. res. j.

View full text Add to dashboard Cite

show abstract

“…c o m / l o c a t e / o r g g e o c h e m et al, 1984; Killops and Readman, 1985). Using partially deactivated micro-particulate alumina as the stationary phase, Radke et al (1984b) obtained a mixed fraction of mono-and diaromatics when enriching alkylnaphthalenes. With a cyano/amino-bonded silica stationary phase, Killops and Readman (1985) achieved a successful ring-class separation of the parent aromatic compounds and aromatics with short alkyl side chains, exemplified by the distribution of alkylphenanthrenes in different fractions.…”

Section: Contents Lists Available At Sciverse Sciencedirectmentioning

confidence: 99%

Rapid column chromatography separation of alkylnaphthalenes from aromatic components in sedimentary organic matter for compound specific stable isotope analysis

Jiang

Zhou

Sun

et al. 2013

Organic Geochemistry

View full text Add to dashboard Cite

“…Th e PAHs in the shale are 3503, 1724, and 908 μg/kg, respectively, in the sequential three ASE with toluene and are the highest among the fi ve samples (Table 1). Immature kerogens and low rank coals were reported to contain very high concentrations of PAHs (Radke et al, 1984(Radke et al, , 2000. Th e contents of total PAHs in the soil sample LW are higher than those in HP, as the sample site LW is close to the center of Guangzhou, a city with developed industry and traffi c. For two sediment samples, the PAHs contents in the ST sample are higher than those of BJ, because the BJ sample is from the upper section of the Pearl River, which contains less contamination than the ST sample.…”

Section: Pahs Contents By Sequential Asementioning

confidence: 99%

Sequential Accelerated Solvent Extraction of Polycyclic Aromatic Hydrocarbons with Different Solvents: Performance and Implication

Ran

Gong

et al. 2010

J of Env Quality

View full text Add to dashboard Cite

Sixteen USEPA priority polycyclic aromatic hydrocarbons (PAHs) extracted by Soxhlet extraction (S-PAHs) with dichloromethane and routine accelerated solvent extraction (A-PAHs) with 1:1 toluene/methanol, respectively, were investigated in 24 soil samples from two cities in the center of the Pearl River Delta, South China. Polycyclic aromatic hydrocarbons, methylphenanthrene and perylene, in two soils, two sediments, and an immature oil shale were also sequentially extracted by accelerated solvent extraction (ASE) with each of four different organic solvents for three times. The A-PAHs' concentrations are 2.41 times the S-PAHs' concentrations. For sequential three ASEs, PAHs in the first extract account for 56 to 67% of their total concentrations in the sequential three extractions and toluene displays the best extraction performance among the four solvents. Diagnostic ratios of PAHs in Soxhlet extraction, routine ASE, and sequential ASE with each solvent for a given sample are very similar, suggesting their identical petrogenic and pyrogenic sources in the soils and sediments. But the PAH ratios for the shale have an obvious petrogenic origin. The perylene/5-ring PAH ratios indicate a diagenetic source, especially in the shale and sediments. The correlation analysis shows that A-PAHs/S-PAHs is better associated with the contents of total organic carbon (TOC) than those of black carbon (BC). The above results indicate the significant petrogenic origin of PAHs and the important effect of organic matter on their extraction and distribution in the investigated field soils/sediments.

show abstract

Class separation of aromatic compounds in rock extracts and fossil fuels by liquid chromatography

Cited by 73 publications

References 38 publications

Using aromatic biological markers as a tool for assessing thermal maturity of source rocks in the Campano-Maastrichtian Mamu Formation, southeastern Nigeria

Using aromatic biological markers as a tool for assessing thermal maturity of source rocks in the Campano-Maastrichtian Mamu Formation, southeastern Nigeria

Rapid column chromatography separation of alkylnaphthalenes from aromatic components in sedimentary organic matter for compound specific stable isotope analysis

Sequential Accelerated Solvent Extraction of Polycyclic Aromatic Hydrocarbons with Different Solvents: Performance and Implication

Contact Info

Product

Resources

About