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Direct Supersonic Expansions of Supercritical Fluids for Analysis of Polycyclic Aromatic Hydrocarbons

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Significant line-narrowing has been observed in the laser-induced fluorescence spectra of naphthalene and perylene in direct supersonic expansions of simple supercritical carriers such as CO2, N2O, and even SF6, under conditions which minimize aerosol and cluster formation. Clusters form readily in expansions of CO2 and N2O unless nozzle temperatures exceed about 200°C. Results with more complex carriers, such as n-pentane, are much poorer. Selective detection of perylene at a limit of 2 ng (S/N = 3) in a mixture of ten polycyclic aromatic hydrocarbons and in a coal tar extract has been achieved with a capillary introduction system. Challenges with coupling supersonic jet detection to capillary supercritical fluid chromatography lie with the nozzle.

Keywords: Polycyclic aromatic hydrocarbon; Supercritical fluid chromatography; Supersonic jet fluorescence

Document Type: Research Article


Affiliations: 1: Department of Chemistry, Brigham Young University, Provo, Utah 84602 2: Department of Chemistry, Brigham Young University, Provo, Utah 84602; current address: Department of Ophthalmology, Eye and Ear Infirmary, University of Illinois College of Medicine at Chicago, Chicago, IL

Publication date: November 1, 1987

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