Zur Chemie von Erdöl und Kohle

Oelert, H. H.; Lenart, Lado

doi:10.1002/ciuz.19750090604

Cited by 5 publications

(10 citation statements)

References 2 publications

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“…The question is at which value of the weight fraction, w, the molecular weight is equal to Mn. From the ultracentrifuge work (2), it is known that, for asphaltenes, Mn in gen- eral corresponds approximately to w -0.25. And this means that, in general, Mn does not correspond to the peak in the elution diagram.…”

Section: Construction Of the Calibration Curvementioning

confidence: 99%

“…In fact, it is sufficient to give 20 values as input (12). where ACKNOWLEDGMENT 02 = (b2/bi)ci (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) Equation 1-15 proves that the second distribution is also log-normal. Equation 1-16 has been used to calculate the standard deviations of the asphaltenes distributions; see Equation 3.…”

Section: Appendix I: the Log-normal Distributionmentioning

confidence: 99%

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Gel-permeation chromatography calibration curve for asphaltenes and bituminous resins

Reerink¹,

Lijzenga²

1975

Anal. Chem.

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tions that took place after elution, the amount varied between 5 and 10 micrograms.By the combination of thin-layer chromatography with "in situ" microreactions or with reactions carried out after elution (without filtration), satisfactory results were obtained in the identification of 17 alkaloids with different composition and structure (the major compounds contained in opium, tropanic and beta-pyridinic derivatives, as well as lysergic acid). Microreactions "in situ" can also be applied for the obtention of standard substances, directly on the start line of the chromatoplate. LITERATURE CITED(1) I.

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Section: Construction Of the Calibration Curvementioning

confidence: 99%

Section: Appendix I: the Log-normal Distributionmentioning

confidence: 99%

Gel-permeation chromatography calibration curve for asphaltenes and bituminous resins

Reerink¹,

Lijzenga²

1975

Anal. Chem.

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“…Some of these components are also present in trace amounts in lignite and hard coal (Oelert and Lenart 1975). The Werdenfels nodule also contains tetracyclic sterane components (Fig.…”

Section: Biological Origin Of the Fossil Resin Nodule And Its Degradamentioning

confidence: 99%

“…7 Catalytic decarboxylation, dealkylation and aromatization of agathic acid (labdanoid type) due to the impact of elevated pressure as described by Ruzicka and Hosking (1930). Reference: Ursula Baumer and Johann Koller, Doerner Institut (10), 128 (7), 141 (7) 7b 131 (100) Resin nodule in the Cretaceous Garschella Fm tetracyclic-C 24 -carboxylic acids based on the cholestaneskeleton found in Californian crude oils were interpreted as the biomarkers for C 24 -bile acids of lower animals (Oelert and Lenart 1975). Since the steranes found in the Werdenfels nodule are non-regular, i.e.…”

Section: Biological Origin Of the Fossil Resin Nodule And Its Degradamentioning

confidence: 99%

A resin nodule in the Cretaceous Garschella Formation from Langer Köchel (Bavaria, S Germany): possible origin and palaeogeographic provenance

Engelbrecht¹,

Föllmi

Baumer³

et al. 2010

Swiss J Geosci

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A resin nodule was found in glauconite-rich detrital sediments of the Cretaceous Garschella Formation (Aptian to Albian) outcropping at Langer Köchel (Bavaria, S Germany). Gas chromatographic and mass spectrometric analyses of the fossil resin revealed dealkylation and the total defunctionalisation of its polycyclic constituents. Besides many unspecific components a specific one, agathalene, has survived. Agathalene also presents a strongly degraded product, but may have been derived from its natural precursor agathic acid, which is a very specific constituent (biomarker) of recent and fossil kauri resin. Although agathalene is a far less specific secondary biomarker, it indicates the botanic origin of the fossil resin nodule. Besides other potential producers of agathic acid, precursors of the present-day conifer species Agathis dammara and A. australis were distributed in a wider palaeophytogeographic range than today and might have been the botanical source of kauri resin. In view of the east-west directed Early Cretaceous surface current system of the Tethys ocean, the palaeogeographic provenance of the Werdenfels resin nodule probably was a mainland positioned further to the east or southeast of the Helvetic shelf, to where it was transported probably by driftwood of the resin-producing Agathis sp.

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“…However, for fossil fuel products and other samples composed primarily of PAC, the relationship between elution volume and molecular size is often complex, and for some samples, a satisfactory correlation cannot be made. The principal reason for this situation is the fact that for the types of gels currently in use, a number of factors other than molecular size govern the separation of PAC (8)(9)(10)(11)(12)(13)(14)(15)(16).…”

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confidence: 99%

Multimode separation of polycyclic aromatic compounds by size exclusion chromatography with poly(divinylbenzene)

Lafleur¹,

Wornat²

1988

Anal. Chem.

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The separation of polycyclic aromatic compounds (PAC) by size exclusion chromatography (SEC) with a poly(dlvlnylbenzene) column and dichloromethane mobile phase was found to be governed by both size-dependent and nonsize effects. The elution of nonplanar PAC substituted with alkyl, phenyl, or electron-withdrawing groups was governed by both effects but generally proceeded In order of decreasing molecular weight. On the other hand, planar PAC demonstrated a pronounced nonsize effect whose strength varied Inversely w|th Ionization potential. PAC separated Into two basic groups: planar and nonplanar. In addition, planar PAC eluted In three groups: (1) cataannelated PAC, (2) simple perlcondensed PAC, and (3) highly perlcondensed PAC.

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Zur Chemie von Erdöl und Kohle

Cited by 5 publications

References 2 publications

Gel-permeation chromatography calibration curve for asphaltenes and bituminous resins

Gel-permeation chromatography calibration curve for asphaltenes and bituminous resins

A resin nodule in the Cretaceous Garschella Formation from Langer Köchel (Bavaria, S Germany): possible origin and palaeogeographic provenance

Multimode separation of polycyclic aromatic compounds by size exclusion chromatography with poly(divinylbenzene)

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