Solid-phase Microextraction of Phosphate and Methylphosphonate Using Novel Fibers Coated with a Sol-Gel-Derived Silicone-Divinylbenzene Co-Polymer
Co-poly (hydroxy-terminated silicone divinylbenzene) coating was first prepared by sol-gel and cross-linking methods and applied to the solid-phase microextraction of phosphate and methylphosphonate from air and water. The possible mechanism is discussed. The characteristics of the new films were also investigated. Compared with commercial SPME fibers, the novel films showed better selectivity and sensitivity towards phosphate and methyphosphonate. Moreover, the coating proved to be very stable at high temperatures and in different solvents. Some important parameters, such as extraction time, extraction temperature, effect of salt and desorption time were optimized. The limits of detection for dimethyl methylphosphonate (DMMP), trimethyl phosphate (TMP) and tributyl phosphate (TBP) were 1.11, 1.46, and 1.64 μg L−1 in air and 0.34, 2.20, and 0.01 μg mL−1 in water. A relative standard deviation (n=6) below 7% can be achieved depending on the compounds both in air and in water. Linear ranges were about 1–2 orders of magnitude. The recovery of spiked water samples was from 89.46 to 90.88%.
Key WordsGas chromatography Solid-phase microextraction Sol-gel fibres Phosphate and methylphosphonate Nerve gases
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