Fluorescence line narrowing spectrometry of polycyclic aromatic hydrocarbons in organic glasses

Brown, Johnie
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Fluorescence line narrowing spectrometry (FLNS), also known as optical site selection spectroscopy, is a relatively new technique holding great promise as an analytical tool. Species specific analysis of complex samples for low concentrations of polycyclic aromatic hydrocarbons (PAHs) is a difficult analytical problem. The PAH analysis problem is reviewed herein as are the mechanisms and characteristics of FLNS which make this new methodology appear ideal for application to the problem. Organic glasses are presented as the cryogenic matrices of choice for analytical FLNS. An experimental arrangement utilizing sensitive gated signal detection is used to test the analytical utility of FLNS;Data presented show that linear quantitative response from concentrations between saturation (about 1 ppm) and the low parts per trillion range is obtained. The demonstrated high precision and linearity of response show that routine analytical FLNS using organic glass matrices need not use internal standard and/or standard addition quantitation schemes;Unambiguous determinations of compounds in complex samplesare shown to be expected. This expectation is shown to be realisticby demonstrating, in successive chapters: the unique FLNS behaviorof each of 27 polycyclic aromatic compounds tested; resolution ofthe 13 fluorescing species in a 14 component artificial mixture; anddetermination of pyrene, 1-alkylpyrene, benzo(e)pyrene, anthracene,benzo(a)pyrene, benzo(k)fluoranthene, and perylene in an;unseparated sample of SRC-II coal liquification product;('1)DOE Report IS-T-986. This work was performed under ContractNo. W-7405-Eng-82 with the U.S. Department of Energy.

Chemistry, Analytic, Chemistry