title: Characterization of sulfur and nitrogen compounds in Brazilian petroleum derivatives using ionic liquid capillary columns in comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometric detection.
abstract: Diesel and naphtha samples were analyzed using ionic liquid (IL) columns to evaluate the best column set for the investigation of organic sulfur compounds (OSC) and nitrogen(N)-containing compounds analyses with comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry detector (GC×GC/TOFMS). Employing a series of stationary phase sets, namely DB-5MS/DB-17, DB-17/DB-5MS, DB-5MS/IL-59, and IL-59/DB-5MS, the following parameters were systematically evaluated: number of tentatively identified OSC, 2D chromatographic space occupation, number of polyaromatic hydrocarbons (PAH) and OSC co-elutions, and percentage of asymmetric peaks. DB-5MS/IL-59 was chosen for OSC analysis, while IL59/DB-5MS was chosen for nitrogen compounds, as each stationary phase set provided the best chromatographic efficiency for these two classes of compounds, respectively. Most compounds were tentatively identified by Lee and Van den Dool and Kratz retention indexes, and spectra-matching to library. Whenever available, compounds were also positively identified via injection of authentic standards.
authors.affiliation: Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, CEP 91501-970, Porto Alegre, RS, Brazil.
authors.forename: Fernando
authors.initials: F
authors.lastname: Cappelli Fontanive
authors.affiliation: Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, CEP 91501-970, Porto Alegre, RS, Brazil.
authors.forename: Érica Aparecida
authors.initials: ÉA
authors.lastname: Souza-Silva
authors.affiliation: Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, CEP 91501-970, Porto Alegre, RS, Brazil.
authors.forename: Juliana
authors.initials: J
authors.lastname: Macedo da Silva
authors.affiliation: Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, CEP 91501-970, Porto Alegre, RS, Brazil.
authors.forename: Elina
authors.initials: E
authors.lastname: Bastos Caramão
authors.affiliation: Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, CEP 91501-970, Porto Alegre, RS, Brazil. Electronic address: cazini@iq.ufrgs.br.
authors.forename: Claudia
authors.initials: C
authors.lastname: Alcaraz Zini
mesh_terms: D001938:Brazil; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods* / Q000592:standards; D006841:Hydrocarbons, Aromatic / Q000032:analysis / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D017672:Nitrogen Compounds / Q000032:analysis* / Q000737:chemistry; D010578:Petroleum; D012015:Reference Standards; D013457:Sulfur Compounds / Q000032:analysis* / Q000737:chemistry
chemical_list: D006841:Hydrocarbons, Aromatic; D052578:Ionic Liquids; D017672:Nitrogen Compounds; D010578:Petroleum; D013457:Sulfur Compounds
keywords: Comprehensive two-dimensional gas chromatography; Diesel; Ionic liquids; Naphtha; Nitrogen compounds; Sulfur compounds