Abstract
A new method is described for determining total gasoline-range organics (TGRO) in water that combines solid-phase microextraction (SPME) and infrared (IR) spectroscopy. In this method, the organic compounds are extracted from 250-mL of water into a small square (3.2 cm × 3.2 cm × 130 μm thick) of Teflon PFA film. This film, a perfluoroalkoxyethylene polymer, lacks C−H bonds and makes it possible to quantitate the extracted organics directly in it via their C−H stretching vibrations. Three gasoline-range fuels, unleaded gasoline, aviation gas, and lighter fuel (petroleum naphtha), were chosen to evaluate the SPME/IR procedure. Preliminary experiments show that method detection limits are in the 0.5−1.5 ppm range for spiked solutions, and precision is relatively good (6−11% RSDs). Linear dynamic ranges of calibration extend to the water solubility limits for all fuels studied. Finally, the potential of this SPME/IR method for determining TGRO in natural “real world” water samples was investigated by extract...
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