Application of silver-assisted laser desorption ionization ultrahigh-resolution mass spectrometry for the speciation of sulfur compounds

We herein report the optimization and application of silver cationization (Ag + ) in combination with laser desorption ionization (LDI) ultrahigh-resolution mass spectrometry (UHR-MS) to determine the structures of the sulfur-containing compounds present in heavy crude oil. A number of sulfur-contai...

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Bibliographic Details
Published in:Analytical and bioanalytical chemistry 2020, Vol.412 (1), p.243-255
Main Authors: Acter, Thamina, Solihat, Nissa Nurfajrin, Kim, Sungjune, Uddin, Nizam, Mustafa, Ahmad Ismail, Shamsuddin, Sayed Md, Kim, Sunghwan
Format: Article
Language:English
Subjects:
Analytical Chemistry
Biochemistry
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Crude oil
Desorption
Food Science
Heavy petroleum
Ionization
Ions
Laboratory Medicine
Mass spectrometry
Mass spectroscopy
Monitoring/Environmental Analysis
Optimization
Research Paper
Scientific imaging
Silver
Speciation
Spectroscopy
Sulfides
Sulfur
Sulfur compounds
Thiols
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Summary:We herein report the optimization and application of silver cationization (Ag + ) in combination with laser desorption ionization (LDI) ultrahigh-resolution mass spectrometry (UHR-MS) to determine the structures of the sulfur-containing compounds present in heavy crude oil. A number of sulfur-containing model compounds were used to optimize the positive-ion mode LDI-MS conditions in the presence of a silver-complexing agent. Under the optimized LDI conditions, sulfur-rich heavy oil fractions were treated with the silver salt, where Ag + coordinated with the sulfur atoms to speciate the sulfur species. The obtained results suggested that benzothiophenic, naphtheno-non-aromatic sulfides, and non-aromatic thiols were the major components present in the analyzed oil sample. Graphical abstract
ISSN:1618-2642
1618-2650
DOI:10.1007/s00216-019-02272-5