Naslov
Correlation of SARA analyses (TLC-FID and Column Chromatography) using crude oils as samples

Autori
Trkulja, Nina ; Zvolinski, Marija ; Španić, Darko ; Keškić, Dijana ; Troskot-Čorbić, Tamara

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts of the Communications presented to the 26th International Meeting on Organic Geochemistry, Vol.1, Vol. 2 / González-Pérez, J.A. ; González-Vila, F.J. ; Jiménez-Morillo, Nicasio T. ; Almendros, G. - Costa Adeje : Consejo Superior de Investigaciones Científicas (CSIC), 2013, 212-213

Skup
26th International Meeting on Organic Geochemistry

Mjesto i datum
Adeje, Španjolska, 15.09.2013. - 20.09.2013

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
SARA, TLC-FID, oil

Sažetak
Crude oils can be described compositionally by a number of methods. SARA analysis divides crude oil fractions (saturated hydrocarbons, aromatic hydrocarbons, resins, asphaltenes) according to their polarisability and polarity using a family of related methods. Problems appear because several of the analytical methods in use do not produce approximately similar results. In this work we tried to make a correlation of two SARA analysis methods: gravity-driven column chromatographic separation (LC) and thin layer chromatography combined with flame ionisation detector (TLC-FID, Iatroscan). In a correlation study we have used different standard crude oils: North Sea Oil-1, ASTM oil #CO1207 USA (July 2012) and the Pannonian (Croatian) oils: Privlaka-13, Hrastilnica-3, Đeletovci-1 Zapad oil, as samples. Samples were analysed repeatedly over a period of several months by both SARA analysis methods. All of the mentioned oils are mostly paraffinic-aromatic types of oil. Different solvents to dissolve maltenes were used for each method and results for LC method are expressed in mass percentages while results for TLC-FID (Iatroscan) method percentages are calculated directly from the raw peak areas. Results that are given in the table show the range of correlation coefficients for saturated hydrocarbons to be from 1, 15-1, 49, aromatic hydrocarbons 1, 23-1, 95, resins 0, 32-0, 41 and asphaltenes 0, 55-0, 84. NSO-1 is a deasphaltened oil from the Oseborg field, Norway. However, using both of the techniques, the presence of asphaltenes in the NSO-1 oil was determined. Analysis of the composition of crude oils can be endlessly complexed, therefor, many reasons are possible to explain such oscillations in the results. The use of different solvents can be one of the factors ; variability of the FID response in Iatroscan method (which can also be due to differences in ionisation efficiency resulting from slight variations of the concentration of material in the adsorbent phase) ; the amount of sample taken for the analysis, overloading in a very small spot at the origin of the rod and many other reasons. Despite the oscillations in the results, the coefficient range for each crude oil fraction does show some correlation between the used methods.

Izvorni jezik
Engleski

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