Journal
ANALYTICA CHIMICA ACTA
Volume 721, Issue -, Pages 61-67Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2012.01.046
Keywords
Microporous silica; Solid-phase microextraction; Liquid-phase microextraction; Water analysis; Organophosphorus compounds
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Funding
- Research Council of Isfahan University of Technology (IUT)
- Center of Excellence in Sensor and Green Chemistry
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A new method based on combination of solid- and liquid-phase microextraction was developed. For the first time, porous flower-like silica microstructures with nanometric layers were created on the surface of the stainless steel wire by a new facile hydrothermal process. The fiber, coated with a suitable organic solvent, was applied for microextraction of some organophosphorus pesticides from aqueous samples followed by gas chromatography-nitrogen phosphorous detection. Method detection limits were between 0.6 and 3 ng L-1. Relative standard deviations for intra- and inter-day precision were 4.4-7.3% and 5.1-7.8%, respectively. Fiber-to-fiber reproducibility for five prepared fibers was 6.3-8.4%. Tap, river and waste water samples were analyzed for evaluation of the method in real sample analysis. Relative recoveries for spiked tap, river and waste water samples were in the range of 94-101%. 89-97% and 82-103%, respectively. In addition, the method was compared with two commercial solid-phase microextraction (SPME) fibers, single drop microextraction (SDME) and liquid-phase microextraction (LPME). The present method showed higher extraction efficiency as compared with SDME, LPME and commercial SPME fibers. (C) 2012 Elsevier B.V. All rights reserved.
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