Produção Nacional
New analytical approaches to organic geochemistry: solid phase functional group extraction for bitumens and functional group markers for kerogens
1980; Elsevier BV; Volume: 12; Linguagem: Inglês
10.1016/0079-1946(79)90109-5
ISSN1879-3568
AutoresCláudio Costa Neto, Ana Maria P. Maçaira, Rui C. Pinto, H. T. Nakayama, Jarí N. Cardoso,
Tópico(s)NMR spectroscopy and applications
ResumoThe first step of a general strategy for the analysis of bitumens and kerogens is based on specific functional group reactions carried out on solid surfaces: for soluble materials (bitumens, tars, etc.) a fractionation of the sample into isofunctional sets of compounds was accomplished by means of the Solid Phase Functional Group Extraction technique. This paper describes the use of the functional reagents diphenylenediamine and carboxyhydrazide bound to a solid (polymer) matrix for the selective isolation of aldehydes and ketones, respectively. The individual compounds were further separated and identified by combined gas chromatography-mass spectrometry. Functional groups of insoluble materials (kerogens) were determined through reactions of specific functional reagents (containing a marker) directly with the solid surface of the kerogen. In this paper, bromine or chlorine were chosen as markers, and the reagents p-bromophenacylbromide, p-chloroaniline, p-chlorobenzenediazonium sulphate, p-chlorobenzaldehyde, N-bromosuccinimide, p-bromobenzoyl chloride, N,N-di(p-bromophenyl)ethylenediamine, and p-bromobenzhydrazide, were used for the determination of the groups carboxylic acid, aldehyde, phenol/aromatic amines, primary amines, allylic/hydrogen, alcohols/primary-secondary amines, aldehydes and carbonyl compounds, respectively. Results are discussed for Brazilian oil shales from the Irati, Tremembé and Maraú Formations.
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