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A Hadamard Transform Spectrometer (HTS) for use in the UV-Visible spectral region is described. The spectrometer is connected on-line to a digital computer to accumulate spectral information and to perform a Fast Hadamard Transform (FHT). The HTS system has been evaluated with several line sources as well as with a continuum source and for the atomic fluorescence measure-

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Rapid scanning constant energy synchronous fluorescence spectrometry (RSCESFS) is evaluated for flow cell design, scan speed, and constant energy interval choice. Analytical figures of merit for several polycyclic aromatic hydrocarbons (PAHs) are given for several experimental conditions, for several flow cells, and for both RSCESFS and conventional (nonscanning) fluorescence spectrometry. With RSCESFS, absolute detection limits as low as 700 fg, linear dynamic ranges as great as five orders of magnitude and the time to record a complete 350 nm spectrum as short as 17 s have been obtained.