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- W2054892018 abstract "To complement the gas chromatography/mass spectrometric separation and detection of 3- and 4-ring organosulfur compounds, established methods for the separation of polyaromatic sulfur heterocycles (PASH) have been coupled to high-performance liquid chromatography/atmospheric pressure chemical ionization/tandem mass spectrometry (HPLC/APCI/MS/MS). The latter technique is capable of detecting both thermally unstable and nonvolatile PASH compounds in a crude oil. Our protocol utilizes distillation, alumina, and ligand exchange chromatography and HPLC to partially fractionate the crude oil. Postcolumn addition of tropylium cations prior to APCI/MS leads to an increase in the sensitivity of the detector toward 3- and 4-ring organosulfur compounds. Nonalkylated species primarily generate radical cations in the APCI source, whereas alkylated species exhibit both radical cation and product ions resulting from addition and/or loss of hydrogen and loss of alkyl groups. MS2 and MS3 fragmentation patterns confirm the presence of dibenzothiophene and benzonaphthothiophene derivatives in an Arabian crude oil." @default.
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- W2054892018 date "2005-06-18" @default.
- W2054892018 modified "2023-09-23" @default.
- W2054892018 title "Detection of Polyaromatic Sulfur Heterocycles in Crude Oil Using Postcolumn Addition of Tropylium and Tandem Mass Spectrometry" @default.
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- W2054892018 doi "https://doi.org/10.1021/ef0400666" @default.
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