Silicone glue coated stainless steel wire for solid phase microextraction |
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Authors: | Panavaite Dalia Padarauskas Audrius Vickackaite Vida |
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Institution: | Department of Analytical and Environmental Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania |
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Abstract: | A new solid phase microextraction (SPME) fiber based on high-temperature silicone glue coated on a stainless steel wire is presented. The fiber coating can be prepared easily in a few minutes, it is mechanically stable and exhibits relatively high thermal stability (up to 260 °C). The extraction properties of the fiber to benzene, toluene, ethylbenzene, and xylenes (BTEX) were examined using both direct and headspace SPME modes coupled to gas chromatography-flame ionization detection. The effects of the extraction and desorption parameters including extraction and desorption time, sampling and desorption temperature, and ionic strength on the extraction/desorption efficiency have been studied. For both headspace and direct SPME the calibration graphs were linear in the concentration range from 0.5 μg L−1 to 10 mg L−1 (R2 > 0.996) and detection limits ranged from 0.07 to 0.24 μg L−1. Single fiber repeatability and fiber-to-fiber reproducibility were less than 6.8 and 21.5%, respectively. Finally, headspace SPME was applied to determine BTEX in petrol station waste waters with spiked recoveries in the range of 89.7-105.2%. |
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Keywords: | Solid phase microextraction Silicone glue coating Gas chromatography Benzene Toluene Ethylbenzene Xylenes |
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