Partition Infrared Method for Total Gasoline Range Organics in Water Based on Solid Phase Microextraction

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• 作者：Danese C. Stahl and David C. Tilotta
• 刊名：Environmental Science & Technology
• 出版年：1999
• 出版时间：March 1, 1999
• 年：1999
• 卷：33
• 期：5
• 页码：814 - 819
• 全文大小：94K
• 年卷期：v.33,no.5(March 1, 1999)
• ISSN：1520-5851

文摘

A new method is described for determining totalgasoline-range organics (TGRO) in water that combines solid-phase microextraction (SPME) and infrared (IR) spectroscopy. In this method, the organic compounds are extractedfrom 250-mL of water into a small square (3.2 cm × 3.2cm × 130 m thick) of Teflon PFA film. This film, aperfluoroalkoxyethylene polymer, lacks C-H bonds andmakes it possible to quantitate the extracted organics directlyin 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 methoddetection limits are in the 0.5-1.5 ppm range for spikedsolutions, and precision is relatively good (6-11%RSDs). Linear dynamic ranges of calibration extend to thewater solubility limits for all fuels studied. Finally, thepotential of this SPME/IR method for determining TGRO innatural "real world" water samples was investigated byextracting wastewater contaminated with gasoline. In thisprocedure, a commercially available gas chromatographystandard was used to calibrate the SPME/IR method. Theresults obtained from the SPME/IR determination of theTGRO in two wastewater samples were in reasonableagreement with those obtained from standard purge-and-trap gas chromatographic analysis.