Molecular characterization and profile identifications of vanadyl compounds in heavy crude petroleums by liquid chromatography/graphite furnace atomic absorption spectrometry

Fish, Richard H.; Komlenic, J.J.

doi:10.1021/ac00267a048

Cited by 94 publications

(48 citation statements)

References 44 publications

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“…This technique separates compounds on a styrene-divinyl benzene gel, based on the effective length of their longest dimension. Previous researchers have successfully used SEC to separate carotenoids from chlorins (King and Repeta, 1994b;Repeta and Gagosian, 1984;Repeta and Gagosian, 1987), and to separate metalloporphyrins from crude oil (Fish and Komlenic, 1984). In this study, a Shodex GPC K-801…”

Section: Size Exclusion Chromatograpy (Sec)mentioning

confidence: 99%

Nitrogen isotopes in chlorophyll and the origin of Eastern Mediterranean sapropels

Sachs¹

1997

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The goals of this thesis were: (1) to establish methods for the determination of nitrogen and carbon isotope ratios in marine particulate and sedimentary chlorophyll derivatives; (2) to establish chlorophyll ()15N and ol3C as proxies for the nitrogen and carbon isotopic composition of marine phytoplankton; and (3) to use chlorophyll nitrogen isotopic ratios to understand the origin of Late Quaternary Eastern Mediterranean sapropels.Techniques are presented for the determination of chlorin nitrogen and carbon isotopic ratios in marine particles and sediments with a precision greater than 0.15 per mil for both isotopes. The procedure can be performed in about 4 hours for particulate and 8 hours for sediment samples, and relies on multiple chromatographic purifications. About 20 g of a moderately organic-rich sediment are required.A technique is also presented for the determination of chlorin nitrogen and carbon isotopic ratios by isotope-ratio monitoring gas chromatography-mass spectrometry (irmGC-MS) by synthesizing bis-(tert.-butyldimethylsiloxy)Si(IV) chlorin derivatives. However, yields for the 4-step synthesis were only about 5-6% and there was a net isotopic depletion of 1.2 (± 0.3) per mil in the derivative, relative to the starting material.These techniques are then used to show that the nitrogen isotopic difference between chlorophyll and whole cells in six species of marine phytoplankton is 5.16 ± 2.40 per mil. For carbon, the isotopic difference between chlorophyll and whole cells in five species of marine phytoplankton is -0.02 ± 2.12 per mil. A model of the distribution of 15N in phytoplankton is constructed and it is demonstrated that the interspecies variability observed for the nitrogen isotopic difference between chlorophyll and whole cells can be attributed to differences in iii the partitioning of cellular nitrogen between non-protein biochemicals. In the field, where mixed assemblages of phytoplankton prevail, the isotopic difference beween chlorophyll and whole cells is expected to tend toward the average value of 5.16 per mil.Finally, the average nitrogen isotopic composition of chlorins from six Late Quaternary Eastern Mediterranean sapropels ( -5.01 + 0.38 per mil) was found to be very similar to the o15N of chlorophyll from the modem deep chlorophyll maximum ( -6.38 ± 1.80 per mil) in the Eastern Mediterranean. In addition, sapropel photoautotrophic material, calculated from the chlorin o15N, had the same isotopic composition (0.15 per mil) as both bulk sapropel sediments (-0.08 ± 0.53 per mil) and deep water nitrate (-0.05 per mil). These data suggest (a) that bottom waters were anoxic, (b) that organic matter burial efficiency was enhanced, and (c) that oligotrophic conditions similar to today persisted, in the Eastern Mediterranean during sapropel deposition. These results contradict earlier interpretations of Late Quaternary bulk sedimentary o15N in the Eastern Mediterranean. The latter concluded that the pattern of high o15N values in intercalated marl oozes and low values in ...

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Section: Size Exclusion Chromatograpy (Sec)mentioning

confidence: 99%

Nitrogen isotopes in chlorophyll and the origin of Eastern Mediterranean sapropels

Sachs¹

1997

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“…Regarding the metals, mostly Ni and V, they are present mainly in resins and asphaltenes in the form of porphyrinic or non-porphyrinic compounds [9,10]. The proportion in the residue of each type of structures varies greatly with the petroleum origin [11].…”

Section: Introductionmentioning

confidence: 99%

Hydrodesulfurization and hydrodemetallization of different origin vacuum residues: Characterization and reactivity

Ferreira

Tayakout‐Fayolle

Guibard

et al. 2012

Fuel

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“…The same spectral characteristics were observed in the Wilmington moderate polar fraction indicating vanadyl petroporphyrins. RS-UV-vis examination of these moderate polar fractions also indicated the presence of vanadyl pet.roporphyrins by the appearance of the distinctive 408 nm Soret band (1,2).…”

Section: Resultsmentioning

confidence: 88%

Molecular Characterization of Nickel and Vanadium Nonporphyrin Compounds Found in Heavy Crude Petroleums and Bitumens

Fish

Reynolds

Gallegos

1987

ACS Symposium Series

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Molecular characterization and profile identifications of vanadyl compounds in heavy crude petroleums by liquid chromatography/graphite furnace atomic absorption spectrometry

Cited by 94 publications

References 44 publications

Nitrogen isotopes in chlorophyll and the origin of Eastern Mediterranean sapropels

Nitrogen isotopes in chlorophyll and the origin of Eastern Mediterranean sapropels

Hydrodesulfurization and hydrodemetallization of different origin vacuum residues: Characterization and reactivity

Molecular Characterization of Nickel and Vanadium Nonporphyrin Compounds Found in Heavy Crude Petroleums and Bitumens

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