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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

Manuel Azenha (Autor) FCUP; Mariana Ornelas (Autor) Outra; Fernando F Silva (Autor) FCUP

Revista

Título: Journal of Chromatography A

Vol. 1216 Nº 48

Páginas: 2302-2306

ISSN: 0021-9673

Editora: Elsevier

Indexação

ISI Web of Knowledge - 32 Citações

Scopus - 34 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: 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).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5