Insight into unresolved complex mixtures of aromatic hydrocarbons in heavy oil via two-dimensional gas chromatography coupled with time-of-flight mass spectrometry analysis

Weng, Na; Wan, Shouhong; Wang, Huitong; Zhang, Shuichang; Zhu, Guangyou; Liu, Jingfu; Cai, Di; Yang, Yunxu

doi:10.1016/j.chroma.2015.03.057

Cited by 29 publications

(12 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Consequently, high resolution analytical techniques, such as comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry (GC×GC-TOFMS), have been applied in biomarker analyses of crude oils Casilli et al, 2014), evaluation of biodegradation (Silva et al, 2011;Soares et al, 2013;Li et al, 2014), assessment of depositional paleoenvironments (Oliveira et al, 2012;Kiepper et al, 2014;Zhang et al, 2015) and study of unresolved complex mixtures (Tran et al, 2010;Eiserbeck et al, 2012;Weng et al, 2015). The purpose of this work is to use GC×GC-TOFMS of steranes, alkyl steranes and other biomarkers in crude oil samples from the Sergipe-Alagoas Basin in order to better describe the source rock depositional environments for the oils.…”

Section: Introductionmentioning

confidence: 99%

Uncommon steranes in Brazilian marginal crude oils: Dinoflagellate molecular fossils in the Sergipe-Alagoas Basin, Brazil

Araújo

Azevedo

2016

Organic Geochemistry

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Uncommon steranes in Brazilian marginal crude oils: Dinoflagellate molecular fossils in the Sergipe-Alagoas Basin, Brazil

Araújo

Azevedo

2016

Organic Geochemistry

View full text Add to dashboard Cite

“…The baseline of gas chromatography is often elevated to form a hump of unresolved complex mixtures (UCMs), which makes many biomarkers concealed and unable to be detected. 7 These new problems make researchers begin to put more attention on the detection of polycyclic aromatic hydrocarbons (PAHs), which are important constituent parts of crude oil and petroleum-refined products. 10−12 In comparison with saturated hydrocarbons, the special ring structure of PAHs brings it some unique capabilities, such as high resistance to weathering, thermal evolution, and biodegradation, providing more information about thermal maturity, oil−source correlation, etc.…”

Section: Introductionmentioning

confidence: 99%

Insight into Polycyclic Aromatic Hydrocarbons in Unconventional Oil via Concentration-Resolved Fluorescence Spectroscopy Coupled with Data Mining Techniques

et al. 2019

View full text Add to dashboard Cite

The exploration, production, and transportation of unconventional oils have attracted increasing attention for their economic value and environmental pressure. However, the previous analytical techniques of conventional oils encounter bottlenecks because of the separation difficulties of the unresolved complex mixtures. It is of great value to develop new methods to pursue a more detailed investigation of the chemical compositions of unconventional oil. Concentration-resolved fluorescence spectroscopy (CRFS) was developed to characterize the multi-dimensional fluorescence features of polycyclic aromatic hydrocarbons in unconventional oil samples. Laboratory simulation experiments of thermal evolution and biodegradation were designed to verify the effectiveness of CRFS compared to gas chromatography−flame ionization detector and gas chromatography−mass spectrometry. Dual-tree complex wavelet analysis and principal component analysis were used to remove redundant information and extract more detailed and effective information on CRFS spectra, and then a generalized regression neural network was used to classify and identify crude oil samples of different heavy oil species. With 100% accuracy, this computer data processing combined CRFS method is proven to be fast, accurate, and economical and is expected to be an effective method to solve the present problem of unconventional oil analysis.

show abstract

“…Examples include the congeners of polychlorinated biphenyls and other polyhalogenated aromatic compounds [1,2], pesticide residues [3,4], hydrocarbon fractions in crude oil [5,6], fatty-acid methyl esters in biodiesel blends [7], and trace-level VOC biomarkers of disease or metabolism in breath and urine [8,9].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive two-dimensional gas chromatographic separations with a temperature programmed microfabricated thermal modulator

Collin

Nuñovero

Paul

et al. 2016

Journal of Chromatography A

View full text Add to dashboard Cite

Comprehensive two-dimensional gas chromatography (GC×GC) with a temperature-programmed microfabricated thermal modulator (μTM) is demonstrated. The 0.78 cm(2), 2-stage μTM chip with integrated heaters and a PDMS coated microchannel was placed in thermal contact with a solid-state thermoelectric cooler and mounted on top of a bench scale GC. It was fluidically coupled through heated interconnects to an upstream first-dimension ((1)D) PDMS-coated capillary column and a downstream uncoated capillary or second-dimension ((2)D) PEG-coated capillary. A mixture of n-alkanes C6-C10 was separated isothermally and the full-width-at-half-maximum (fwhm) values of the modulated peaks were assessed as a function of the computer-controlled minimum and maximum stage temperatures of μTM, Tmin and Tmax, respectively. With Tmin and Tmax fixed at -25 and 100°C, respectively, modulated peaks of C6 and C7 had fwhm values<53 ms while the modulated peaks of C10 had a fwhm value of 1.3s, due to inefficient re-mobilization. With Tmin and Tmax fixed at 0 and 210°C, respectively, the fwhm value for the modulated C10 peaks decreased to 67 ms, but C6 and C7 exhibited massive breakthrough. By programming Tmin from -25 to 0°C and Tmax from 100 to 220°C, the C6 and C7 peaks had fwhm values≤50 ms, and the fwhm for C10 peaks remained<95 ms. Using the latter conditions for the GC×GC separation of a sample of unleaded gasoline yielded resolution similar to that reported with a commercial thermal modulator. Replacing the PDMS phase in the μTM with a trigonal-tricationic room temperature ionic liquid eliminated the bleed observed with the PDMS, but also reduced the capacity for several test compounds. Regardless, the demonstrated capability to independently temperature program this low resource μTM enhances its versatility and its promise for use in bench-scale GC×GC systems.

show abstract

Insight into unresolved complex mixtures of aromatic hydrocarbons in heavy oil via two-dimensional gas chromatography coupled with time-of-flight mass spectrometry analysis

Cited by 29 publications

References 43 publications

Uncommon steranes in Brazilian marginal crude oils: Dinoflagellate molecular fossils in the Sergipe-Alagoas Basin, Brazil

Uncommon steranes in Brazilian marginal crude oils: Dinoflagellate molecular fossils in the Sergipe-Alagoas Basin, Brazil

Insight into Polycyclic Aromatic Hydrocarbons in Unconventional Oil via Concentration-Resolved Fluorescence Spectroscopy Coupled with Data Mining Techniques

Comprehensive two-dimensional gas chromatographic separations with a temperature programmed microfabricated thermal modulator

Contact Info

Product

Resources

About