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A new solid phase micro extraction for simultaneous head space extraction of ultra traces of polar and non-polar compounds

Alizadeh, Reza, Najafi, Nahid Mashkouri, Kharrazi, Sharmin
Analytica chimica acta 2011 v.689 no.1 pp. 117-121
biphenyl, coatings, detection limit, gas chromatography-mass spectrometry, headspace analysis, longevity, nanorods, non-polar compounds, silica, solid phase microextraction, temperature, zinc oxide
The results of the innovative study on a new stationary phase with high efficiency based on ZnO nano and micro rod coating on fused silica are reported in this paper. ZnO nanorods with a diameter in the range of 70–300nm and the length of about 500nm, have been grown on fused silica fibers using a hydrothermal process. The extraction properties of the fiber were investigated using headspace solid-phase microextraction (HS-SPME) mode coupled with gas chromatography–mass spectrometry detection (GC–MS) for 1,4-dichloro-nitrobenzene, biphenyl and acenaphthene. The calibration curves were linear up to 10²–10⁷ngL⁻¹ (R²>0.995) with detection limits of 10⁻³ngL⁻¹ for biphenyl and acenaphthene and 10ngL⁻¹ for 1,4-dichloro-nitrobenzene. The RSD for single fiber and fiber-to-fiber were less than 7.0 and 11.5%, respectively. The high stability of the ZnO coating is proved at relatively high temperatures (up to 300°C) with a high extraction capacity and long lifespan (more than 100 times). Promising recoveries (91–102%) were obtained in environmental water samples analysis by applying the proposed technique.