Determination of Vanadium/Nickel Proportionality in the Asphaltene Fraction of Crude Oil Using Thin-Layer Chromatography with Femtosecond Laser Ablation鈥揑nductively Coupled Plasma鈥揗ass Spectrometry
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- 作者：Jos茅 Chirinos ; Dayana Oropeza ; Jhanis Gonz谩lez ; Mar铆a Ranaudo ; Richard E. Russo
- 刊名：Energy & Fuels
- 出版年：2013
- 出版时间：May 16, 2013
- 年：2013
- 卷：27
- 期：5
- 页码：2431-2436
- 全文大小：284K
- 年卷期：v.27,no.5(May 16, 2013)
- ISSN：1520-5029
文摘
A method that integrated thin-layer chromatography (TLC) with femtosecond laser ablation鈥搃nductively coupled plasma鈥搈ass spectrometry (fs-LA鈥揑CP鈥揗S) was developed for the determination of the proportionality of vanadium/nickel in the asphaltene fraction of crude oils. TLC is easy and fast to implement for separation of crude oil components requiring minimal amount of solvents, and fs-LA鈥揑CP鈥揗S allows for direct analysis of the TLC plates without any additional sample preparation. This method was tested on Venezuelan crude oil samples and their isolated asphaltenes. The results correlated well to those obtained using a traditional method for asphaltene analysis involving separation and digestion with measurements by inductively coupled plasma鈥搊ptical emission spectroscopy (ICP鈥揙ES). The combination of TLC with fs-LA鈥揑CP鈥揗S provided fast and reliable measurements of V/Ni proportionality in asphaltene and directly from the crude oil without solvent-exchange processes.