Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 405, Issue 8, Pages 2661-2669Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-013-6716-5
Keywords
Oxidized single-walled carbon nanohorns; Hollow fiber; Solid-phase microextraction; Triazines; Waters
Funding
- Spanish DGICyT [CTQ2011-23790]
- Junta de Andalucia [P09-FQM-4801]
- Spanish Ministry of Education [AP2007-02597]
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This paper evaluates the potential of oxidized single-walled carbon nanohorns (o-SWNHs) immobilized on the pores of a hollow fiber (HF) for the direct immersion solid-phase microextraction of triazines from waters. The fabrication of the device requires the oxidation of the nanoparticles by means of microwave irradiation in order to obtain a homogeneous dispersion in methanol. Then, a porous hollow fiber is immersed in the methanolic dispersion of the o-SWNHs under ultrasound stirring. This procedure permits the immobilization of the o-SWNHs in the pores of the hollow fiber. For the extraction, a stainless steel wire was introduced inside the fiber to allow the vertical immersion of the o-SWNHs-HF in the aqueous standard/water sample. The triazines were preconcentrated on the immobilized o-SWNHs and further eluted using 150 mu L of methanol. The solvent was evaporated and the residue reconstituted in 10 mu L of methanol for sensitivity enhancement. Gas chromatography-mass spectrometry was selected as instrumental technique. The limits of detection were between 0.05 and 0.1 mu g L-1 with an excellent precision (expressed as relative standard deviation) between runs (below 10.2 %) and between fibers (below 12.8 %). Finally, the method was applied to the determination of the triazines in fortified waters, an average recovery value of 90 % being obtained.
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