IDENTIFICATION AND DETERMINATION OF CARBAZOLES IN NATURAL AND SYNTHETIC OILS BY GAS CHROMATOGRAPHY WITH THERMIONIC DETECTION

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Abstract

A modified sample preparation method for oils for the determination of carbazoles is proposed, involving deasphalting of oil by settling a sample of oil in a 40-fold excess of n-hexane for one day and using non-modified silica gel instead of argentated. In this case, carbazoles are eluted in one fraction. Conditions for the identification and determination of carbazole, 9-methyl-, and 9-ethylcarbazole by gas chromatography with thermionic detection were selected, and the analytical characteristics of the method were established. The choice of 3-nitro-9-methylcarbazole as an internal standard for carbazole determination was justified, and its synthesis was performed. The presence and quantity of carbazoles in oils from different fields and in a synthetic oil sample were assessed. A comparison of carbazole determination results in natural oils using the external standard method, internal standard, and additions was conducted. It was shown that all methods yield the same results within the error limits. The carbazole content in natural oils for the studied samples was found to be in the range of 0.14–2.61 mg/kg. 9-Ethylcarbazole was detected in four oil samples.

About the authors

A. V Pirogov

Lomonosov Moscow State University

Email: Pirogovav@my.msu.ru
Department of Chemistry Moscow, Russia

A. A Lagutin

Lomonosov Moscow State University

Department of Chemistry Moscow, Russia

D. A Karpeev

Lomonosov Moscow State University

Department of Chemistry Moscow, Russia

O. A Shpigun

Lomonosov Moscow State University

Department of Chemistry Moscow, Russia

Yu. A Zolotov

Lomonosov Moscow State University

Department of Chemistry Moscow, Russia

T. V Grigorenko

Lomonosov Moscow State University

Faculty of Geology Moscow, Russia

G. G Savostin

Lomonosov Moscow State University

Faculty of Geology Moscow, Russia

A. G Kalmykov

Lomonosov Moscow State University

Faculty of Geology Moscow, Russia

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