A liquid chromatography-atmospheric pressure photoionization tandem mass spectrometric method for the determination of organosulfur compounds in petroleum asphalt cements.

Autor: da Silveira GD; Department of Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil; Graduate Program in Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil., Faccin H; Department of Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil; Graduate Program in Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil., Claussen L; Department of Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil; Graduate Program in Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil., Goularte RB; Department of Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil; Graduate Program in Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil., Do Nascimento PC; Department of Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil; Graduate Program in Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil., Bohrer D; Department of Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil; Graduate Program in Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil., Cravo M; Centro de Pesquisa e Desenvolvimento 'Leopoldo Américo Miguez de Mello (CENPES), PETROBRAS, Rio de Janeiro, RJ, Brazil., Leite LF; Centro de Pesquisa e Desenvolvimento 'Leopoldo Américo Miguez de Mello (CENPES), PETROBRAS, Rio de Janeiro, RJ, Brazil., de Carvalho LM; Department of Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil; Graduate Program in Chemistry, Federal University of Santa Maria (UFSM), Santa Maria-RS, Brazil. Electronic address: lemacarvalho@gmail.com.
Jazyk: angličtina
Zdroj: Journal of chromatography. A [J Chromatogr A] 2016 Jul 29; Vol. 1457, pp. 29-40. Date of Electronic Publication: 2016 Jun 03.
DOI: 10.1016/j.chroma.2016.06.003
Abstrakt: We present a sensitive liquid chromatography-atmospheric pressure photoionization tandem mass spectrometric (UHPLC-APPI-MS/MS) method for the determination of selected organosulfur compounds in Brazilian asphalt cements. It was possible to detect 14 organosulfur compounds of different classes where sulfoxides and sulfones presented higher sensibility in ionization than thiophenes and aromatic sulfides. A dopant-assisted APPI method was also tested, however, when chromatographic flow rate was optimized a decrease in signal was observed for all compounds. PAHs were tested and ruled out as possible interfering compounds and the matrix effect of asphalt cements was within an acceptable range for the quantification of organosulfur compounds. The proposed method was found to have satisfactory linearity and accuracy with recoveries between 83.85 and 110.28% for thianaphthene and 3-methylbenzothiophene, respectively. Therefore, the method allowed the characterization of organosulfur compounds in Brazilian asphalt cements and demonstrated changes in the amount quantified in asphaltenic and maltenic fractions after the RTFOT+SUNTEST aging process.
(Copyright © 2016 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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