title: A liquid chromatography-atmospheric pressure photoionization tandem mass spectrometric method for the determination of organosulfur compounds in petroleum asphalt cements.
abstract: 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.
authors.affiliation: 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.
authors.forename: Géssica Domingos
authors.initials: GD
authors.lastname: da Silveira
authors.affiliation: 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.
authors.forename: Henrique
authors.initials: H
authors.lastname: Faccin
authors.affiliation: 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.
authors.forename: Luis
authors.initials: L
authors.lastname: Claussen
authors.affiliation: 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.
authors.forename: Rayane Bueno
authors.initials: RB
authors.lastname: Goularte
authors.affiliation: 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.
authors.forename: Paulo C
authors.initials: PC
authors.lastname: Do Nascimento
authors.affiliation: 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.
authors.forename: Denise
authors.initials: D
authors.lastname: Bohrer
authors.affiliation: Centro de Pesquisa e Desenvolvimento "Leopoldo Américo Miguez de Mello (CENPES), PETROBRAS, Rio de Janeiro, RJ, Brazil.
authors.forename: Margareth
authors.initials: M
authors.lastname: Cravo
authors.affiliation: Centro de Pesquisa e Desenvolvimento "Leopoldo Américo Miguez de Mello (CENPES), PETROBRAS, Rio de Janeiro, RJ, Brazil.
authors.forename: Leni F M
authors.initials: LF
authors.lastname: Leite
authors.affiliation: 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.
authors.forename: Leandro Machado
authors.initials: LM
authors.lastname: de Carvalho
mesh_terms: D001274:Atmospheric Pressure; D001938:Brazil; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006838:Hydrocarbons / Q000737:chemistry*; D010578:Petroleum / Q000032:analysis*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D013440:Sulfides / Q000032:analysis; D013450:Sulfones / Q000032:analysis; D013454:Sulfoxides / Q000032:analysis; D013457:Sulfur Compounds / Q000032:analysis*; D053719:Tandem Mass Spectrometry / Q000379:methods; D013876:Thiophenes / Q000032:analysis
chemical_list: D006838:Hydrocarbons; D010578:Petroleum; D011084:Polycyclic Aromatic Hydrocarbons; D013440:Sulfides; D013450:Sulfones; D013454:Sulfoxides; D013457:Sulfur Compounds; D013876:Thiophenes; C006647:asphalt
keywords: Aging asphalt; Asphalt cements; Matrix effect; Organosulfur compounds; UHPLC-APPI-MS/MS