Abstract

We present a unique method for the unambiguous determination of dibenzo[<i>a,l</i>]pyrene, dibenzo[<i>a,e</i>]pyrene, dibenzo[<i>a,h</i>]pyrene, dibenzo[<i>a,i</i>]pyrene, and dibenzo[<i>e,l</i>]pyrene in high-performance liquid chromatography (HPLC) fractions. Chemical analysis is performed via laser-excited time-resolved Shpol'skii spectroscopy with the aid of a cryogenic fiber-optic probe, pulsed tunable dye laser, spectrograph, and intensified charge-coupled device. Unambiguous identification is accomplished via wavelength time matrix formats, which give simultaneous access to spectral and lifetime information. Prior to spectroscopic analysis, HPLC fractions are pre-treated with liquid–liquid extraction or solid–liquid extraction at the tip of the fiber-optic probe. Solid–liquid extraction gives the best limits of detection, which vary from 40 pg mL^-1 (dibenzo[<i>a,l</i>]pyrene) to 0.2 ng mL^-1(dibenzo[<i>e,l</i>]pyrene).

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