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PARTITION INFRARED METHOD FOR TOTAL GASOLINE RANGE ORGANICS IN WATER BASED ON SOLID PHASE MICROEXTRACTION. (R825343)
Citation:
Stahl, D. AND D. C. Tilotta. PARTITION INFRARED METHOD FOR TOTAL GASOLINE RANGE ORGANICS IN WATER BASED ON SOLID PHASE MICROEXTRACTION. (R825343). ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 33:814-819, (1999).
Description:
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 src="/ncer/pubs/images/mgr.gif">m 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 extracting
wastewater contaminated with gasoline. In this procedure, a commercially
available gas chromatography standard was used to calibrate the SPME/IR method.
The results obtained from the SPME/IR determination of the TGRO in two
wastewater samples were in reasonable agreement with those obtained from
standard purge-and-trap gas chromatographic analysis.