We present a compact andmobile battery-operated laser induced fluorescence (LIF) system. It is based on a diode-pumped solid-state laser with UV frequency con- version and a 7-ns pulse duration. The third (355nm)and fourth (266nm) harmonics of the laser can be used alter- nately. The detection system consists of a polychromator, a gated image intensifier, and a CCD camera, which can ac- quire time-resolved spectra with nanosecond time resolution. Fluorescence spectra, decay times, and detection limits of the 16 US-EPA polycyclic aromatic hydrocarbons (PAH) have been measured and the results are discussed in terms of separability of single PAHs in a multicomponent mixture. The results of a mathematical analysis of a 16-component mixture is presented. Spectra from naturalwater samples con- taminated with gasoline and tar are also presented and the potential and limits of the LIF technique are discussed.
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