Journal
RSC ADVANCES
Volume 7, Issue 64, Pages 40608-40614Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra06763a
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Funding
- National Natural Science Foundation of China [21607137]
- Fundamental Research Funds for the Central Universities, China University of Geosciences [CUG160606]
- China National Science and Technology Major Project [2016ZX05006003-001]
- China Geological Survey Project [12120114046901]
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In this work, a micro-solid phase extraction (micro-SPE) method was developed for the analysis of petroleum acids in crude oils. Plastic vessels were found to be unsuitable as the micro-SPE vessel, because of the plasticizer interferences and the serious adhesion of oil samples on vessel surfaces. To reduce or eliminate these influences, a glass pipette was selected as the micro-SPE vessel. With the glass pipette micro-SPE format, amino-functionalized silica was chosen as the sorbent for extraction of petroleum acids based on mix-mode hydrogen bonding/ion-exchange interactions. The conditions of the micro-SPE were carefully optimized. Under the optimized conditions, no evaporation was needed, which can save time and reduce losses of analytes. By coupling with gas chromatography-mass spectrometry (GC-MS), the proposed micro-SPE method for analysis of petroleum acids was proved to be easily operated, fast (the micro-SPE can be accomplished within 5 min), solvent-saving (3 mL of solvent), reproducible and sensitive (the limits of detection range from 2 ng g(-1) to 6 ng g(-1)).
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