Vanadium and nickel complexes in petroleum resid acid, base, and neutral fractions

Pearson, C.D.; Green, J. B.

doi:10.1021/ef00039a001

Cited by 42 publications

(37 citation statements)

References 2 publications

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“…Nonaqueous ionexchange chromatography (NIELC) was proposed to fractionate petroleum into acid, base and neutral components; UV detection was used. 65,66 The column was packed with a (4-pyridil)ethylsilica stationary phase. The elution was carried out with different gradients of n-heptane, benzene, and benzene:ethanol (7:3).…”

Section: Normal-phase Hplcmentioning

confidence: 99%

Element speciation analysis of petroleum and related materials

Caumette

Lienemann²,

Merdrignac³

et al. 2009

J. Anal. At. Spectrom.

101

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Section: Normal-phase Hplcmentioning

confidence: 99%

Element speciation analysis of petroleum and related materials

Caumette

Lienemann²,

Merdrignac³

et al. 2009

J. Anal. At. Spectrom.

101

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“…4,11 The porphyrin carbon skeleton consists of a tetrapyrrolic, planar, cyclic molecule linked with methine bridges, 1,11 and etioporphyrins are the simplest structural class, with ethyl and methyl substitution at the Cβ position on each pyrrole. 4,12 Structures of nickel and vanadyl porphyrins have been characterized by Xray crystallography 13 and vibrational spectroscopy.…”

mentioning

confidence: 99%

Chromatographic Enrichment and Subsequent Separation of Nickel and Vanadyl Porphyrins from Natural Seeps and Molecular Characterization by Positive Electrospray Ionization FT-ICR Mass Spectrometry

Putman

Rowland

Corilo³

et al. 2014

Anal. Chem.

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We report a novel chromatographic method to enrich and separate nickel and vanadyl porphyrins from a natural seep sample and combine molecular level characterization by positive-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Vanadyl and nickel porphyrin model compound elution from primary secondary amine (PSA) stationary phase combined with UV-vis spectroscopy confirms enrichment and subsequent fractionation of nickel and vanadyl porphyrins into polarity-based subfractions. A more than 100-fold increase in signal-to-noise ratio for nickel porphyrins enables unequivocal elemental composition assignment confirmed by isotopic fine structure for all isotopes >1% relative abundance, and the first mass spectral identification of (61)Ni porphyrin isotopologues derived from natural seeps. Oxygen-containing vanadyl porphyrins and sulfur-containing vanadyl porphyrins are isolated in the same fraction simultaneously from the same sample. We provide the first chromatographic evidence of carboxylic acid functionalities peripheral to the porphyrin core, in agreement with previous studies.

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“…Raised bioavailabilities of both nickel and vanadium can indicate the presence of spilled oil or refined fuel in a coastal system, for both trace metals are commonly associated with oil (Pearson & Green, 1993). There was some similarity between rank orders of sites for nickel and vanadium bioavailabilities for O. gammarellus (Table 2), but not a significant correlation (Spearman's Rank).…”

Section: Discussionmentioning

confidence: 99%

Trace metal bioavailabilities in the Thames estuary: continuing decline in the 21st century

et al. 2015

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Levels of pollution, including contamination by toxic metals, in the Thames estuary reduced over the last four decades of the 20th century. This 2014 study investigates whether the declines in the bioavailabilities of trace metals (Ag, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, V, Zn) have continued in the 21st century, using a suite of littoral biomonitors also employed in 2001 – the brown seaweed Fucus vesiculosus, the strandline, talitrid amphipod Orchestia gammarellus and the estuarine barnacle Amphibalanus improvisus. Bioaccumulated concentrations represent relative measures of the total bioavailabilities of each metal to the biomonitor over a previous time period, and can be compared over space and over time. Trace metal bioavailabilities varied along the estuary, and, in general, fell between 2001 and 2014, a reflection of the continuing remediation of the Thames estuary from its severely polluted state in the middle of the 20th century.

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Vanadium and nickel complexes in petroleum resid acid, base, and neutral fractions

Cited by 42 publications

References 2 publications

Element speciation analysis of petroleum and related materials

Element speciation analysis of petroleum and related materials

Chromatographic Enrichment and Subsequent Separation of Nickel and Vanadyl Porphyrins from Natural Seeps and Molecular Characterization by Positive Electrospray Ionization FT-ICR Mass Spectrometry

Trace metal bioavailabilities in the Thames estuary: continuing decline in the 21st century

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