Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1247, Issue -, Pages 42-48Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2012.05.055
Keywords
Solid-phase microextraction; Fiber coating; Vinyl-SBA-15 mesoporous organosilica; BTEX; Phenols
Funding
- Project of National Natural Science Foundation of China [21077137, 21077135]
- Public Science and Technology Research Funds Projects of Ocean [201005025]
- Fundamental Research Funds for the Central Universities [09Igpy13]
- Tegent Technology Ltd.
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Vinyl-SBA-15 mesoporous organosilica was synthesized and used as coating material of solid-phase microextraction (SPME) by two coating techniques (direct coating and sol-gel). The synthesized vinyl-SBA-15 organosilica had highly ordered mesoporous structure, good thermal stability and a specific surface area of 688 m(2) g(-1). The fibers prepared by two methods were evaluated by the extraction of non-polar compounds (BTEX, benzene, toluene, ethylbenzene. o-xylene) and polar compounds (phenols). The results showed that the vinyl-SBA-15 fibers prepared by two methods exhibited high thermal stability (310 degrees C for direct-coated and 350 degrees C for sol-gel) and excellent solvent durability in methanol and acetonitrile. The fibers also presented much better extraction performance for both polar compounds (phenols) and non-polar compounds (BTEX), compared to commercial polydimethylsiloxane (PDMS) fiber, as well as wide linear ranges, low detection limits (0.008-0.047 mu g L-1 for BTEX, sol-gel; 0.15-5.7 mu g L-1 for phenols, direct-coated), good repeatabilities (RSDs less than 5.4% for BTEX) and satisfying reproducibilities between fibers (RSDs less than 5.8% for BTEX). The self-made fibers were successfully used for the analysis of BTEX and phenols in three aqueous samples including tap water, mineral water and lake water, which demonstrated the applicability of the vinyl-SBA-15 fibers. (c) 2012 Elsevier B.V. All rights reserved.
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