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An innovative micro-extraction of aqueous samples coupled with gas chromatography/mass spectrometry in selected ion-monitoring mode (GC/MS-SIM) was developed to selectively analyze for 1,4-dioxane with low part-per-billion detection sensitivity. Recoveries of 1,4-dioxane ranged from 93% to 117% for both spiked laboratory reagent water and natural groundwater matrices, the later having elevated organic carbon content (8.34 ± 0.31 mg/L as total organic carbon). We observed that freezing the aqueous sample along with the extraction solvent enhanced the extraction efficiency, minimized physical interferences, and improved sensitivity resulting in a limit of detection for 1,4-dioxane to approximately 1.6 µg/L. This method substantially reduces the labor, time, reagents and cost, and uses instruments that are commonly found in analytical laboratories. This method requires a relatively small sample volume (200 µL), and can be considered a green analytical method as it minimizes the use of toxic solvents and the associated laboratory wastes. |
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