Direct determination of benzene in gasoline by flow-injection Fourier transform infrared spectrometry

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

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 647 KB
• Volume: 274
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)80475-z

✦ Synopsis

A Founer transform mfrared spectrometnc procedure for the automated determmatxon of benzene m gasoline was developed, based on the use of flow-m)ectlon analysis The method permits the direct determmatlon of benzene unthout any pretreatment of samples, w~tb a hnut of detection of 0 02% (v/v> and a relative standard deviation of ca 1% [for five mdependent analyses of a dduted sample contammg a 0 4% (v/v> of benzene] Results found by direct analysis agreed wth those obtamed by off-lme and on-line standard addltlon methods A rapld quality control procedure was developed, based on the on-hne mjectlon of gasohne samples (dduted 1 + 9 m hexane) mto a earner stream of a 0 5% (v/v> solution of benzene m hexane, m this instance, the baselme corresponds to the upper hnut tolerated by the European Econonuc Commumty's law for gasohnes Thus, the mJectlon of dduted samples wth an appropnate level of benzene must provide no peaks or negatnre peaks, whereas those wrth a benzene concentration higher than that tolerated prowde posltlve peaks A senes of real samples were analysed by the proposed procedure and the results obtained were comparable to those given by gas chromatography Kkywor& Flow ln)ectlon, Infrared spectrometry, Benzene, Gasolme