TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
GC-MS and FTIR Analysis of Bitum/Kerogen as Organic Geochemistry Index
(Analiza prin GC-MS si FTIR a bitumului/kerogenului ca marker organic geochimic)
Vol LXII • No. 3A/2010
Ioana-Raluca Bunghez*, Rodica-Mariana Ion*, Radu Claudiu Fierascu, Claudiu Radu*, Irina Dumitriu*, Mihaela-Lucia Ion**, Marian Neata***, Sanda-Maria Doncea*
* Valahia University, Materials Engineering Department, Unirii Bv., 18-20, Targoviste, Romania
& ICECHIM, Analytical Department, 202 Splaiul Independentei, Bucharest, Romania
e-mail: raluca_bunghez@yahoo.com
** University of Bucharest, Art History Faculty, Bucharest, Romania
*** University of Bucharest, PROTMED, 90 Panduri Str., Bucharest, Romania
& RENAR, 18 Plugarilor str., Bucharest, Romania

 Keywords   GC-MS, FTIR, bitum/kerogen analysis.

 Abstract
Archaeological samples have complex compositions consisting in bitumen organic deposit and sometimes, petroleum deposit and natural substances. The materials are usually identified by Fourier transformed infrared spectroscopy (FTIR) (for detecting the functional groups of organic substances) and gas chromatography coupled with mass spectrometry (GC-MS) (for analysis of natural substances such as vegetable resins and oils, bitumen, tar and pitch, and waxes), respectively. For the analyzed samples in this paper, all the hydrocarbons identified confirm that the black substance is a kerogen-type mixture. Moreover, the C16:0 and C18:0 concentrations are indicating that the compounds are native to the patina.

 Rezumat
Probele arheologice au compoziţii complexe, constând în depozite organice de bitum şi, uneori, de petrol şi alte substanţe naturale. Materialele sunt de obicei identificate prin spectrometria IR cu transformata Fourier (FTIR) (pentru detectarea grupelor funcţionale de substanţe organice) şi gaz-cromatografie cuplată cu spectrometrie de masă (GC-MS) (pentru analiza de substanţe naturale, cum ar fi răşini şi uleiuri vegetale, bitum, gudron şi ceară). Pentru probele analizate în această lucrare, toate hidrocarburile identificate confirma că substanţa neagră prezenta pe artefacte este un amestec tip kerogen. Mai mult decât atât, concentratiile C16:0 şi C18:0 indică faptul că acesti compusi apartin patinei.



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