Modified copper wire as solid-phase microextraction fiber, selective extraction of some amines

This paper presents results obtained using modified copper wire as a solid-phase microextraction (SPME) fiber. Modified copper fibers were prepared by dipping cleaned copper wires (350 μm o.d.) in a solution of CuCl2. Scanning electron microscopy experiments suggested the formation of a thin layer of CuCl microcrystals (d.p.<1 μm) on the metal surface. These fibers were used for the extraction of some volatile amines from gaseous samples. Extracted analytes were transferred to a GC injector using a homemade SPME device. Results obtained show that the proposed fiber has high selectivity and good recovery for extraction of amines. More than 83% of primary amines were extracted in 5 min from 50 mL gas sample with a relative standard deviation (RSD) <0.5% (n=5). Calibration graphs were linear in the range 0.3–15 ng mL−1 for primary amines. The detection limit was 0.1–0.3 ng mL−1 (S/N=3) using a flame ionization detector.