Solid-phase microextraction Ni-Ti fibers coated with functionalised silica particles immobilized in a sol-gel matrix

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Manuel Azenha (Author) FCUP; Mariana Ornelas (Author) Other; Fernando F Silva (Author) FCUP

Journal

Title: Journal of Chromatography A

Vol. 1216 No. 48

Pages: 2302-2306

ISSN: 0021-9673

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 32 Citations

Scopus - 34 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-003-MFS

DOI: 10.1016/j.chroma.2009.01.054

Abstract (EN): One of the possible approaches for the development of novel solid-phase microextraction (SPME)fibers is the physical deposition of porous materials Oil to a support using high-temperature epoxy glue. However, a major drawback arises from decomposition of epoxy glue at temperatures below 300 degrees C and instability in some organic solvents. This limitation motivated us to explore the possibility of replacing the epoxy glue with a sol-gel film, thermally more stable and resistant to organic solvents. We found that functionalised silica particles could be successfully attached to a robust Ni-Ti wire by using a UV-curable sol-gel film. The particles were found to be more important than the sol-gel layer during the microextraction process, as shown by competitive extraction trials and by the different extraction profiles observed with differently functionalised particles. If a quality control microscopic-check aiming at the rejection of fibers exhibiting unacceptably low particle load was conducted, acceptable (6-14%) reproducibility of preparation of C(18)-silica fibers was observed, and a strong indication of the durability of the fibers was also obtained. A cyclohexyldiol-silica fiber was used, as a simple example of applicability, for the successful determination of benzaldehyde. acetophenone and dimethyl phenol at trace level in spiked tap water. Recoveries: 95-109%; limits of detection: 2-7 mu g/L; no competition effects within the studied range (<= 125 mu g/L).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5