In this study, a new solid phase microextraction (SPME) fiber based on activated charcoal and polyvinyl chloride (PVC) coated on silver wire is presented. This fiber is very mechanically and thermally stable. Unlike commercial fiber, which is coated on fused silica, this fiber has a metallic base to which the coating adheres very strongly. On the other hand, producing this fiber is very fast, and can be completed in less than 30 min. This compares favorably with the time to make a fiber based on fused silica, which may last several days, due to many steps, such as conditioning in HCl, drying, deactivation, impregnation with a binder and coating. Also, this fiber is stable up to 250˚C. It has been successfully used for the analysis of n-alkanes in the gaseous phase and headspace of soil samples after optimization of the experimental parameters by capillary gas chromatography. The relatively high capacity of the sorbent allows 20 -30% of the analytes to be transferred to a separative system during first extraction.
On the basis of the affinity of alumina towards hydroxyl functional groups, a solid phase microextraction (SPME) fiber was constructed using alumina powder and poly(vinyl chloride) (PVC). Different compositions were tested and alumina:PVC (97:3) was selected as an optimun composition. A piece of silver wire was used as fiber support. The fiber producing was simple and could be completed in a few minutes. The mechanical durability of the fiber was so good that only a single fiber was used during this study. Ethanol, 1-butanol, 2-butanol, 1-pentanol, 2-pentanol and cyclohexanol were selected as target analytes. Finally, ethanol concentration in the fruit juices and vinegar was measured using SPMEcapillary gas chromatography followed by flame ionization detection.
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