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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
Published on: February 11, 2012
Niobium(V) oxide coated on thin glass-ceramic rod as a solid phase microextraction fiber
Aline Fernandes de Oliveira1, Cristian Berto da Silveira, Silvia Denofre de Campos
1Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis 88040-900, SC, Brazil.
Abstract:
The efficiency of niobium(V) oxide as a sorbent phase for solid phase microextraction (SPME) was investigated. The thin glass-ceramic rod was coated with niobium(V) oxide using chemical vapor deposition and Nb(2)O(5) as a chemical precursor. Optimum conditions for the preparation and conditioning of the fibers are presented. The fibers were used for the extraction of a mixture of alcohols and a mixture of phenols from the headspace samples. The results obtained proved the suitability of niobium(V) oxide as a new SPME fiber. The calibration graphs for alcohols and phenols in a concentration range of 50-1000 microgl(-1) were linear (r>0.995) and the detection limits were below 0.8 microgl(-1) level. The repeatability for one fiber (n=6) under similar conditions was between 3 and 10.4%. The fiber-to-fiber reproducibility (n=6) was between 5 and 15%.
