Flow-injection derivative Fourier transform infrared determination of methyl tert-butyl ether in gasolines

✍ Scribed by Miguel de la Guardia; Máximo Gallignani; Salvador Garrigues

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 633 KB
• Volume: 282
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)80118-5

✦ Synopsis

A procedure was developed for the flow-injection Fourier transform (FT) infrared spectrometric determination of methyl teti-butyl ether @ITBE) in unleaded gasolines. The method is based on the use of first+rder derivative measurements in a flow system. The experimental procedure requires only the dilution of samples with hexane and the injection of a 3%~1 volume into a carrier flow of hexane. The ET-IR spectra are continuously recorded and the first-order derivative obtained. The flow-injection peaks are established from the variation with time of the dA/dt iralues found between 1209 and 1201 cm-'. Using a micro flow cell with a 0.117 mm path length and a carrier flow-rate of 0.45 ml min-', the lit of detection of the method corresponds to 0.035% (v/v). The recovery of MTBE varies from 98.2 to 102% and the relative standard deviation is 0.6% for samples containing 0.8% (v/v) MTBE. Results obtained in the analysii of real unleaded gasoline samples compare well with those found by gas chromatography.