Method for the quantification of vanadyl porphyrins in fractions of crude oils by High Performance Liquid Chromatography–Flow Injection–Inductively Coupled Plasma Mass Spectrometry

Wandekoken, Flávia G.; Duyck, Christiane; Fonseca, Teresa C.O.; Saint’Pierre, Tatiana Dillenburg

doi:10.1016/j.sab.2016.03.001

Cited by 12 publications

(11 citation statements)

References 28 publications

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“…Even more recently, another group Wandekoken et all [22] developed a methodology for separation of organic vanadyl 5 compounds in crude oil using fractionation by preparative liquid chromatography using as eluent different mobile phases, in their results all the V is linked to porphyrin structure, discarding the existence of non porphyrinics Vanadium compounds and a similar distribution of the vanadyl porphyrins between polar and non polar fractions.…”

Section: Introductionmentioning

confidence: 99%

Development of a chromatographic methodology for the separation and quantification of V, Ni and S compounds in petroleum products

Vargas

Castillo

Ocampo-Torres

et al. 2017

Fuel Processing Technology

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Additionally, the use of ultraviolet (UV)-visible spectroscopy allows the identification of fractions containing porphyrinic-type compounds by detecting the Soret band at 405 nm.The correlation between this two-step approach is to deduce both the distribution and nature of Ni and V complexes within the sample.This method reduces the complexity of petroleum matrices and producessimpler fractionsthat can be used for further studies.

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Section: Introductionmentioning

confidence: 99%

Development of a chromatographic methodology for the separation and quantification of V, Ni and S compounds in petroleum products

Vargas

Castillo

Ocampo-Torres

et al. 2017

Fuel Processing Technology

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“…The oils (0.5 g) were pre-fractionated on a gravimetric glass column (50 × 2.5 cm 2 ), using a gradient elution of heptane-toluene-dichloromethane-methanol/ chloroform/water (65/35/4, v/v/v). 41 Two fractions were obtained: (i) paraffins, aromatics and polar compounds (PAP); and (ii) RA, with mass recoveries higher than 85%. This first separation was necessary, in order to minimize the contamination of the RA fraction during the automated separation.…”

Section: Samples Reagents and Standardsmentioning

confidence: 99%

“…The HPLC-ICP-MS method for V determination in the labile metalloporphyrins fractions was applied to the samples. 41…”

Section: Samples Reagents and Standardsmentioning

confidence: 99%

“…As it can be seen in Figure 3, the improvement in resolution regarding conventional SARA and SEC separation allows to distinguish between the V-porphyrinic samples profiles. 22,44 The V chromatograms of the labile fraction obtained for crude oils from different origins and biodegradation levels by HPLC-ICP-MS with two RP18 columns in series, using the methodology described in Wandekoken et al, 41 show that the complexity of V-porphyrins rise with the biodegradation level (O-1 < NIST 8505). There is a profile difference between O-1 and A, as well, from terrestrial and marine reservoirs, possibly related to the difference in bacterial activity.…”

Section: Determination Of V-porphyrins By Hplc-icp-msmentioning

confidence: 99%

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Automatized Separation of Fractions from Petroleum Based on Spectrophotometric Signal Derivative Using Open-Source Hardware for the Determination of Ni and V Linked to Porphyrins

Silva¹,

Pereira²,

Pierre³

et al. 2019

J. Braz. Chem. Soc.

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An automated method based on open-source hardware was created for the separation of porphyrins fractions from crude oil, an essential step for the quantification of V and Ni as metalloporphyrins. Preparative liquid chromatography was implemented with a reverse phase gradient from MeOH to toluene. The system allows three solvents and fractions changes by using quaternary valves connected to an Arduino microcontroller, programmed on the basis of the absorbance signal measured and its first derivative. Additionally, the method was applied to crude oils (Venezuelan National Institute of Standards and Technology (NIST) 8505 and from a marine reservoir). V and Ni were determined by inductively coupled plasma mass spectrometry (ICP-MS) and the V-porphyrin profile was determined by high performance liquid chromatography (HPLC)-ICP-MS. The concentrations of the metals grow in the last eluting toluene fractions, associated with asphaltenes. On the other hand, V-porphyrins in the first eluting MeOH fractions showed profiles of labile compounds, with a higher percentage in the Brazilian crude oil (4.9 mg L-1 , corresponding to 18% of total V), in comparison to the one from the biodegraded NIST 8505 (59 mg L-1 , corresponding to 7% of total V). The overall methodology has a good reproducibility and provides information on elements concentrations associated with porphyrin class compounds.

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“…Porphyrins, chelated with nickel and vanadyl, are widely described in the literature [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive two-dimensional liquid chromatography with inductively coupled plasma mass spectrometry detection for the characterization of sulfur, vanadium and nickel compounds in petroleum products

Bernardin

Masle

Bessueille-Barbier

et al. 2020

Journal of Chromatography A

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The petroleum industry is increasingly concerned with the conversion of vacuum residues as a consequence of decreased conventional crude oil availability. The compositional analysis of heavy oil products has become a key step in conversion processes, but the complexity of these oil matrices tends to increase with their boiling point. In this study, comprehensive two-dimensional liquid chromatography (LCxLC) coupled to inductively coupled mass spectrometry (ICP-MS/MS) is considered with a view to meet new requirements and to bring additional information regarding the species present in these matrices. In search for a high degree of orthogonality, two separation techniques involving two different retention mechanisms were evaluated: Size Exclusion Chromatography (SEC) and Reverse Phase Liquid Chromatography (RPLC). In SEC, the analytes are separated according to their molecular weight while according to their hydrophobicity in RPLC. The separation power of both individual separation techniques was first evaluated. Off-line and on-line LCxLC were compared on the basis of an optimization approach. It is shown that off-line SECxRPLC can provide, for the same analysis time of 150 min, a higher peak capacity (2600 vs 1700) while a similar dilution factor (close to 30) but also requires far fewer fractions to be analyzed (12 vs 2 400). Asphaltenes which constitute the heaviest fraction of crude oils (obtained from petroleum industry) were analyzed by the developed off-line SECxRPLC method. The resulting 2D-contour plots show that co-elutions could be removed leading, for the first time, to new information on high molecular weight species containing sulfur and vanadium.

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Method for the quantification of vanadyl porphyrins in fractions of crude oils by High Performance Liquid Chromatography–Flow Injection–Inductively Coupled Plasma Mass Spectrometry

Cited by 12 publications

References 28 publications

Development of a chromatographic methodology for the separation and quantification of V, Ni and S compounds in petroleum products

Development of a chromatographic methodology for the separation and quantification of V, Ni and S compounds in petroleum products

Automatized Separation of Fractions from Petroleum Based on Spectrophotometric Signal Derivative Using Open-Source Hardware for the Determination of Ni and V Linked to Porphyrins

Comprehensive two-dimensional liquid chromatography with inductively coupled plasma mass spectrometry detection for the characterization of sulfur, vanadium and nickel compounds in petroleum products

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