Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 412, Issue 1, Pages 243-255Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-019-02272-5
Keywords
Silver cationization; Ultrahigh-resolution mass spectrometry; Laser desorption ionization; Fourier transform ion cyclotron resonance mass spectrometry
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [2017R1A2B3003455]
- Korea Basic Science Institute (KBSI) National Research Facilities & Equipment Center (NFEC) - Korean government (Ministry of Education) [2019R1A6C1010001, 2019R1A6C1030012]
- National Research Foundation of Korea [2019R1A6C1030012] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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