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|Type:||Artigo de evento|
|Title:||Highly Porous Solid-phase Microextraction Fiber Coating Based On Poly(ethylene Glycol)-modified Ormosils Synthesized By Sol-gel Technology|
|Author:||Gomes Da Costa Silva R.|
|Abstract:||The preparation and characteristics of solid-phase microextraction (SPME) fibers coated with Carbowax 20M ormosil (organically modified silica) are described here. Raw fused silica fibers were coated with Carbowax 20M-modified silica using sol-gel process. Scanning electron micrographs of fibers revealed a highly porous, sponge-like coating with an average thickness of (8 ± 1) μm. The sol-gel Carbowax fibers were compared to commercial fibers coated with 100 μm polydimethylsiloxane (PDMS) and 65 μm Carbowax-divinylbenzene (DVB). Shorter equilibrium times were possible with the sol-gel Carbowax fiber: for headspace extraction of the test analytes, they ranged from less than 3 min for benzene to 15 min for o-xylene. Extraction efficiencies of the sol-gel Carbowax fiber were superior to those of conventional fibers: for o-xylene, the extracted masses were 230 and 540% of that obtained with 100 μm PDMS and 65 μm Carbowax-DVB fibers, respectively. © 2004 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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