Improved extraction of glycol ethers from water by solid-phase micro extraction by carboxen polydimethylsiloxane-coated fiber
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15 glycol ethers can be extracted from water by solidphase microextraction with a carboxen-polydimethyl-siloxane and separated by GC a Carbowax column. Water containing 15 glycol ethers at concentrations 0.1–10 mg.L−1 is saturated at ambient temperature with NaCl. A carboxen-polydimethylsiloxane-coated fiber is then exposed to the liquid for 20 min and then automatically injected into a capillary GC injection port. Calibration curves were linear for different glycol ethers in the rang 0.1–10 mg.L−1 Detection limits of each component of the mixture of glycol ethers between 50–500 μg.L−1. The SPME method with direct immersion in water results in better sensivity than methods based on liquid-liquid extraction.
Key WordsGas chromatography Solid-phase microextraction (SPME) Glycol ethers
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