Abstract: The efficiency of a glass-ceramic rod as a base for the preparation of SPME fibers using thermal immobilization was investigated. Glass-ceramic and fused silica rods were thermally immobilized with poly(butylacrylate) and their absorption capacity was compared. The absorption capacity between the fiber obtained for thermal immobilization of poly(butylacrylate) on glass-ceramic surface and commercially PA fiber was also compared. In this study the target analytes were phthalate esters and phenols. The results obtained for extraction of phenols from aqueous solutions using the headspace mode demonstrated the superiority of glass-ceramic in relation the silica gel rod as a base for SPME fiber. The direct SPME extraction of phthalate esters from aqueous solutions using commercial PA fiber and that obtained for thermal immobilization of poly(butylacrylate) on glass-ceramic rod presented similar results. The repeatability and the reproducibility among extractions using fibers developed in our laboratory were achieved.

Key words: Gas chromatography; solid-phase microextraction; glass-ceramic base; phthalate esters; phenols; thermal immobilization.